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2021 Online Presentations
2021 ACI Spring Convention, Virtual Sessions
123 Forum: Can Alkali-activated Materials Compete with Portland Cement?
Alkali-activated concrete (AAC) is a class of clinkerless binders made by activating aluminosilicates (e.g., fly ash or slag) with alkaline solutions. Alkali-activation is not a recent innovation—its first mention in scientific literature dates back to more than a hundred years ago. Over the past two decades however, researchers have focused intently on advancing AAC as an alternative to portland cement concrete. Despite widespread academic interest, the concrete industry has yet to adopt AAC into practice. Some experts question the sustainability of AAC; some challenge its long-term durability; others claim the materials and technology do not scale. This forum will discuss the practice-readiness of AAC, highlighting its perceived benefits and the obstacles that hinder its potential widespread acceptance.
Should Alkali-activated Materials Compete with Portland Cement? by John Provis, The University of Sheffield
Do Alkali Activated Materials have a Potential to Significantly Reduce Global CO2 by Karen Scrivener, Ecole Polytechnique Fdrale De Lausanne
Adjusting Workability for Successful 3-D Concrete Printing, Part 1 of 2
These sessions will be co-sponsored by RILEM Technical Committee 276-Digital fabrication with Cement-based Materials. Additionally, they will include presentations by U.S and international teams involved in 3DConcrete, an NSF AccelNet Program to enhance global network-to-network collaborations on concrete 3D printing. These sessions will highlight the importance of controlling fresh-state properties for the successful execution of 3D concrete printing (3DCP). 3DCP is a new method of casting that can introduce a number of advantages but there are also significant challenges, especially in controlling the viscoelastic properties of the concrete in the fresh state. Academic and industry researchers and practitioners interested in 3DCP should attend this session. Attendees will learn: i) the current state-of-the-art of 3DCP; ii) how rheology directly impacts printing performance; iii) strategies to effectively control workability for 3DCP; and iv) key challenges in bringing 3DCP to practice.
Buildability, Rheological Properties, and Early-age Deformations of 3D-Printed Cement-based Materials by Mohamadreza Moini, Princeton University
Dispersed Nano- and Micro-sized Portlandite Particulates via Electrosteric Exclusion at Short Screening Lengths by Iman Mehdipour, University of California, Los Angeles
Enabling 3DCP Through the Use of Ternary-Blended Binder and In-line Mixing Nozzle by Wilson Ricardo Leal Da Silva, Danish Technological Institute
3-D-Concrete-Printing by Layered Extrusion – Requirements for Fresh Concrete and Testing by Viktor Mechtcherine, TU Dresden
Controlling Rheology of 3D Printable Concrete Through Vibration by Karthik Pattaje Sooryanarayana, University of Illinois Urbana-Champaign
Material Tailoring in The Extruder, Controlling Hydration, and Rheology by Lex Reiter, ETH Zürich
Exploring the Influence of Material Characteristics and Extruder Geometry on 3-D Printing of Cementitious Binders by Sooraj Nair, Arizona State University
Printability Metrics for Additive Manufacturing of Cement-based Materials by Joseph Biernacki, Tennessee Technological University
Architects' Day Lunch and Learn
The Nubian Vault's mudbrick process has advantages for economic and educational growth in the building industry for local communities. As the revival of the Nubian Vault construct has taken hold in Sub-Saharan Africa, the rainy season continues to halt progress in Africa's more tropical regions. With assistance from Dwell Earth, a company founded by two brothers in Texas, and the measured use of concrete, the Nubian Vault's failures have the potential for success in the tropics. My presentation will look at the history of the Nubian Vault from ancient Egypt to Hassan Fathy's twentieth-century revival and the recent work of the French /Burkinabé NGO La Voûte Nubienne. Lastly, I will show the failed experiments and the subsequent potential for success.
Rethink the Nubian vault in Sub-Saharian Africa by Coleman A. Jordan, Morgan State University's School of Architecture and Planning
Architects' Day Session: Achieving Excellence in Concrete Construction – Following The REACH from Concept to Completion
This session will provide insight into the design and construction process of The REACH project (winner of the 2020 ACI Excellence Award) with a behind the scenes virtual "tour" of the project and insight into specifying concrete mix designs.
Meeting Design Goals with Architectural Concrete by Larry Rowland, Lehigh White Cement Company, Cementir Holding N.V.
Architects' Day Session: Teamwork Makes the Dream Work
Learn how the architects, structural engineer, and formwork designers worked together to achieve the overall vision of The REACH.
The Reach by Jeffrey Beane, Silman Associates
The Reach – Design in Detail by Sarah Murphy, BNIM
The Reach at Kennedy Center by Steve Karasik, PERI Formwork Systems, Inc.
Best Practices and Lessons Learned for Teaching Concrete Materials and Reinforced Concrete
This session features presentations associated with 11 collaborative papers written by groups of faculties who use some of the most innovative approaches to teach topics in concrete materials and reinforced concrete design at the undergraduate level. The session will include presentations related to general pedagogy, along with teaching hydration of cement, fresh and hardened properties of concrete, durability, additive manufacturing, nondestructive testing, detailing, the equivalent rectangular stress block, failure types of reinforced concrete beams, nonrectangular beams, and analysis and design for shear. The session will also include a presentation by the Walter P. Moore Award Winner.
Effective Teaching Methods in Concrete Education by Matthew Swenty. Virginia Military Institute
Pedagogical Approaches to Teaching Cement Hydration Processes to Undergraduate Students by Lisa Burris, Ohio State University
Best Practices and Lessons Learned: Nondestructive Testing by Armen Amirkhanian, University of Alabama
Innovative Pedagogical Approaches for Concrete Durability by Heather Kirkvold, James Madison University
Pedagogical Approaches for Additive Manufacturing with Cementitious Materials by Jacob Henschen, University of Illinois Urbana-Champaign
Teaching Concrete Through Context by Anahid Behrouzi, California Polytechnic State University
Pedagogical Techniques Used to Teach Detailing of Reinforced Concrete Structures by Kacie D'Alessandro, Virginia Military Institute
Understanding the Equivalent Rectangular Stress Block by Chris Carroll, Saint Louis University
Teaching Flexural Strength (Failure Modes) in Reinforced Concrete by Royce Floyd, The University of Oklahoma
Visualizing Non-rectangular Beams by Chris Carroll, Saint Louis University
Approaches for Teaching Shear Analysis and Design of Reinforced Concrete by Royce Floyd, The University of Oklahoma
The Concrete Industry in the Era of Artificial Intelligence
The synopsis of this session is to educate researchers, practitioners, students, and officials on the merit of using AI in the concrete industry. Special attention will be paid to better the performance of concrete materials at ambient and elevated temperatures and showcase the substantial potential of using AI to improve design of concrete structures under traditional and fire conditions. Introduce AI and automation to the concrete industry.
Machine Learning Applications in Structural Engineering: Hope, Hype or Hindrance? by Henry Burton, University of California, Los Angeles (UCLA)
The Use of Machine Learning Algorithms and IoT Sensor Data for Concrete Performance Testing and Analysis by Andrew Fahim, Giatec Scientific Inc.
Damage Detection in Concrete Bridge T Girders Using 3-D Finite Element Simulations Trained by Artificial Neural Network by Hayder Rasheed, Kansas State University
The Power of Statistical Learning Applied to the Proportioning of Fiber-Reinforced Concrete by Emilio Garcia Taengua, University of Leeds
Self-healing Capacity of Cementitious Materials Based on Data Mining Strategies by Liberato Ferrara, Polytechnic University of Milan
Autonomous Evaluation of Fire-damaged Concrete Structures by M. Z. Naser, Clemson
Concrete Pavement Design and Construction Special Session Honoring Dr. Shiraz Tayabji
This session honors the many contributions made by Dr. Shiraz Tayabji to the American Concrete Institute and to the concrete pavement community as a whole. Dr. Tayabji is a long-time member of ACI, a Fellow, and a former chair of ACI 325, Concrete Pavements. To highlight the range of technical areas that Dr. Tayabji has contributed to throughout his distinguished career, this session includes presentations by prominent concrete pavement researchers and practitioners on important concrete materials, design, rehabilitation, and performance topics. The information presented in this session will be of interest to concrete materials engineers, pavement designers, and construction personnel.
40 Years of Concrete Pavement Innovations by Shiraz Tayabji, Advanced Concrete Pavement Consultancy LLC
Theory Versus Reality in Concrete Airfield Pavement Engineering by Raymond Rollings, Rollings Consulting, LLC
Continuously Reinforced Concrete Pavements by Dan Zollinger, Texas A&M Transportation Institute
Concrete Strength Variability and Mix Design for Large Concrete Paving Projects by W. Charles Greer, Jr
Durability of Concrete Pavement Materials by Peter Taylor, National Concrete Pavement Technology Center
Precast Concrete Pavements by Mark B. Snyder, Pavement Engineering and Research Consultants, LLC
Concrete Overlays by Julie Vandenbossche, University of Pittsburgh
Recent Innovations for CRCP by Jeffery Roesler, University of Illinois at Urbana-Champaign
Constructability and Shotcrete Construction in the Windy City
Constructability analysis of the structural systems is a key step in optimizing time, quality, and economic considerations of a project. Shotcrete construction practices and techniques are used to an advantage on multi story projects. This session looks to case studies, best practices, and material sciences for strategies to best achieve a building structure that meets the demanding requirements of the industry.
Constructability of Mass Shotcrete by Stacia Van Zetten, Exact Technology
Constructability of Zero Lot Lines Foundations with Shotcrete by Charles Hanskat, American Shotcrete Association
Constructability of Top – Down Construction Methods by Eamonn Connolly, James McHugh Construction Co.
Architectural Shotcrete – Creative, Sustainable and Durable Concrete Structures Using Shotcrete by Charles Hanskat, American Shotcrete Association
Constructability Reviews are Subjective Depending on Your Perception by James Cornell, JN Cornell Associates, LLC
Exploiting SSI Effects in Structural Design of Bridges
Soil structure interaction (SSI) effects are studied through instrumented bridges in the field and extensive dynamic analyses. Studies show that foundation compliance owing to SSI attenuates seismic demands in monolithic bridge piers but may accentuate seating demands for bearing supports in bridges that are not continuous with the piers. This session aims to assess the design implications of SSI in controlling the pier/bearing demands as a retrofit measure in existing bridges, as well as to establish a framework for its explicit consideration in new seismic design of bridges, particularly in seismic events of large intensity.
A Framework for Development of Soil and Foundation Model for Seismic SSI Analysis of Bridges by Mohamed Sayed, University of Toronto
Seismic Performance Assessment of Multi-Span Continuous Concrete Girder Highway Bridges in British Columbia Considering Soil-Structure Interaction by Muntashir Billah, Lakehead University
How the Choice of Various SSI Models Influences the Seismic Response of Medium-Span Bridges by Nathalie Roy, University of Sherbrooke
Moderating Influence of SSI on Drift Demands in Piers of Older Bridges by Stavroula Pantazopoulou, York University
Behavior of a Bridge Pile Foundation under Combined Vertical and Lateral Loads by Sri Sritharan, Iowa State University
Fusion of Visual and Nondestructive Techniques for Bridge Evaluation
The session will discuss the use of multiple nondestructive testing (NDT) methods for assessing the conditions of aging concrete bridges and how data fusion can be used to combine and "image" both visible surface conditions and unseen internal conditions. Thus it is anticipated that speakers will cover the use of a wide range of NDT methods for bridge decks, superstructure and substructure condition assessment and their fusion with one or more additional methods including: computer-based photographic mapping of cracking/spalling damage; infrared thermography; ground penetrating radar; acoustic/impact echo/surface waves scanning of decks; and, corrosion activity mapping with half-cell potential, resistivity and polarization methods.
Multi-Technology Approach to Bridge NDE by Shane D Boone, Bridge Diagnostics, Inc.
Multi-sensor Data Collection and Fusion Using Deep Autoencoders in Condition Evaluation of Concrete Bridge Decks by Jinying Zhu, Lakehead University
Diagnostic Imaging of Concrete Using Fusion of GPR and Ultrasonic Array Images by Thomas Schumacher, Portland State University
How to Get Modern Concrete Pumped to the Right Floor
High rise construction, specifically in Chicago, is continuing to push the limits of what is possible with concrete. Buildings are going up higher and developers are requesting more livable square footage, requiring concrete with very strict requirements and specifications. This results in a chain of preparation once a building is announced from the mix design development and raw material sourcing, to the testing of the mix design meeting specification, to the contractor who will do the placement and construction. Individuals in each stage of the process must work together to ensure a successful project. Collaboration and information exchange between designers, architects, contractors, producers, and testing labs needs to be streamlined and improved to ensure that the structural properties of the material can be matched with constructability. Testing labs should be more involved with the design and certification of mix designs to ensure that the specification is being adhered to, while contractors need to take the concrete and place it in the building. As such, it needs to be pumpable and workable once it comes out of the pump 60+ stories in the air, which adds an additional constraint placed upon all who are involved. Designers require more specific properties of materials, which results in substantial challenges in finding the appropriate materials and mix designs.
What Are We Going to Pump That With? by Eamonn Connolly, James McHugh Construction Co.
This Isn't Pumping Well – Do We Really Need More Super? by Walter Flood, Flood Testing Labs
Consistency Via In-transit Concrete Management Aiding Contractors in Reducing Jobsite Delays by Brett Harris, GCP Applied Technologies
Pumping Concrete for Trump, Aqua and The Coast Towers in Chicago by Jake Gibbons
Overview of Research on Reducing Pumping Pressure for High-strength SCC by Dimitri Feys, Missouri S&T
Is SCC Consolidation-Free?
Mixtures designated as self-consolidating concrete (SCC) may need a certain amount of consolidation to eliminate surface blemishes, to flow through congested areas, and to meet slump flow loss during construction. Care must be exercised in consolidating highly flowable mixtures such as semi SCC and SCC because they can lose stability. This session will address the consolidation needs of semi SCC and SCC and the effects of type and duration of vibration on the stability of these mixtures. There will be case studies and lessons learned. Researchers, engineers, contractors, and practitioners will benefit from the experience of the presenters.
The Impact of Rheology on Self-Consolidation by Joseph Daczko, Corporation
Testing and Consolidation of Test Samples for SWC and FR-SWC by Kamal Khayat, Missouri University of Science and Technology
Consolidation of Self-Consolidating Concrete in Precast/Prestress? by G Terry Harris, GCP Applied Technologies
The Future of Coal Combustion Products in Concrete, Part 1 of 2
Fly ash has been the most widely used SCM in concrete for decades. For this reason, significant changes in its production and quality during the last 10 years, have driven a growing interest in harvesting fly ash from impoundments or landfills for use in concrete. Processed coal bottom ash and other CCPs that are currently not used in concrete have also been identified as an emerging supplementary cementitious materials that can help meet the demand for materials that can impart fly ash-like benefits to concrete. This session will provide the opportunity to learn about the characteristics and performance of new and emerging coal combustion products for use in concrete. Students, academics, concrete producers, contractors, specifiers and material suppliers will benefit from the information presented in this session.
Pozzolanic Properties of Ground Coal Bottom Ash by Michael Thomas, University of New Brunswick
An Improved Strength Activity Index Test by Prannoy Suraneni, University of Miami
A New Performance-based Mixture Proportioning Approach for Concrete Containing Coal Combustion Products by Keshav Bharadwaj Ravi, Oregon State University
Performance Based Prediction of Reclaimed and Conventional Fly Ash with Bulk Oxide Analysis by Tyler Ley, Oklahoma State University
Performance Evaluation and Beneficiation of High Sulfur and High Alkali Off-spec Fly Ashes by Gopakumar Kaladharan, Pennsylvania State University
Fly Ash Supply: Current Statistics and Forecasted Supply by Thomas H Adams, American Coal Ash Association
Bottom Ash for Use as a Pozzolan in Concrete by Cole Spencer, Boral Resources
Durability Testing of Marginal and Unconventional Fly Ash by Christopher Shearer, South Dakota School of Mines Tech
Use of Spray Dryer Absorber Material as a Partial Replacement for Portland Cement in Concrete by Robert Jewell, Univ of KY Center for Applied Energy Research
Reclaimed Coal Ash as a Supplementary Cementitious Material: Productive Reuse including Chemi-mechanical Beneficiation by Daniel Benkeser, Georgia Institute of Technology
Integration of Innovative Techniques and Approaches for Optimum Concrete Structure Rehabilitation
This session intends to present case studies or projects where innovative techniques were used to assess the condition of concrete structures and plan rehabilitation strategies. The techniques include nondestructive testing, corrosion measurements, modeling, and monitoring. The session is meant for engineers and practitioners.
A Novel "Coupled" Approach to Evaluate and Extend the Service Life of an Existing Structure by Jacques Marchand, SIMCO Technologies Inc.
Trial Implementation of Impressed Current Cathodic Protection as Part of a Structure Rehabilitation Strategy by Eyad Alhariri, Structural Technologies
Structural Condition Assessment of Environmental Concrete Structures before Rehabilitation by Pericles Stivaros, GEI Consultants, Inc
Longfellow Tower – 16+ Years Later by Timothy Gillespie, Sika Corporation
Development of 3rd Generation Corrosion Inhibiting Admixture for Large Repair/Greenfield Projects by Surendra Manjrekar, Sunanda Speciality Coatings Pvt. Ltd.
Microbially Induced Corrosion of Concrete
Corrosion of concrete in sewer infrastructures is a worldwide concern. Although the mechanism of this corrosion was discovered in the middle of last century, it was not a universal concern until the late 1990s. Since then, research has confirmed that the cause of this corrosion is a biogenic acid attack. Solutions for mitigation and testing processes for assurance have been developed. This session is for anyone interested in knowing exactly what causes sewer corrosion and what methods of mitigation are available.
Microbially Induced Corrosion: Mechanisms and a Discussion of Standardized Testing Uses and Limitations by W Jason Weiss, Oregon State University
Benchtop Biogenic Testing of Microbially Induced Corrosion of Concrete by O. Burkan Isgor, Oregon State University
The Use of Acid-Resistant Alkali-Activated Cement (AAC) Concrete by Wil Srubar, University of Colorado Boulder
The Use of Alternative Cements to Protect Concrete in an MICC Environment by James Aldred, Concrete Future Pty Ltd.
Improving the MIC Resistance in Dry Cast Concrete Pipe Using Nanoplatelets by Amirpasha Peyvandi, Jacobs
The Efficacy of Antimicrobial and Colloidal Silica Additives to Mitigate MICC by Samuel Lines, Concrete Sealants, Inc.
Performance of Slag Cement with Portland-limestone Cement in Concrete
Early-age performance of slag cement with Type IL cement has been found to be equal to or better than with Portland cement from the same source. The alumina in the slag cement can react with more of the finely divided limestone to form additional carboaluminate hydrates that then results in reduced porosity and increased early-age strength. There is also reduced permeability, as indicated by ASTM C1202 test results. While some early published papers indicated a potential concern for an increased risk of low-temperature thaumasite sulfate attack, our extensive long-term tests on concretes have shown that Type IL cement- slag cement combinations are as resistant to sulfate attack as Type I cement-slag cement combinations and more resistant than equivalent w/cm concretes made with Type V cements to both the ettringite and thaumasite forms of degradation. This course will include discussion on these two topics and will also look at some recent projects with these materials. Speakers will walk through different reaction rates such as resistivity and diffusion with portland limestone cements, strength results and modeling.
Performance of Slag Cement with Portland‐limestone Cement in Concrete by R Doug Hooton, University of Toronto
Slag and Portland Limestone Cement: A Symbiotic Relationship by W Jason Weiss, Oregon State University
The synopsis of this session is to educate researchers, practitioners, students, and officials on the merit of This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.
Anchorage of Large High-Strength Headed Reinforcing Bars by Ali Banaeipour, University of Kansas
Reducing Drying Shrinkage and Micro-Cracking in Concrete using Superabsorbent Cellulose by Afraa Hassan, Lakehead University
Rethinking Reinforcement for 3-D Printed Cementitious Composites
The fabrication of novel reinforced concrete structures using digital technologies requires the definition of suitable strategies for reinforcement implementation. Reinforcement integration must be compatible with either the shape or the specific printing technique adopted for each structural element production. This session aims to provide the latest updates on opportunities and techniques using "reinforced concrete" for engineers, architects, and researchers actively involved in or simply interested in three-dimensional (3-D) printing with cementitious composites. These techniques have been developed to further expand the outreach of digitally fabricated concrete materials and structures.
Flexural Performance of Dually Reinforced 3-D Concrete Printed Beams by Marchant van den Heever, Stellenbosch University
Fiber Reinforcement for 3-D Printed Cementitious Systems by Sooraj Nair, Arizona State University
An Experimental Set-up to Assess the Early Age Mechanical Performance of Fiber Reinforced Mortars Used in 3-DCP by Liberato Ferrara, Polytechnic University of Milan
Reinforcing 3-D Printed Concrete Structures by Steel Nails - A Feasibility Study by Arnaud Perrot, Universite De Bretagne Sud
Interlayer Reinforcement for Digitally Fabricated Concrete Structures by Jaime Mata-Falcon, ETH Zurich
External Reinforcing System for 3-D Printed Concrete Elements: Technology and Design Approach by Costantino Menna, University of Naples Federico II
Integrating Reinforcement in Digital Fabrication with Concrete by Viktor Mechtcherine, TU Dresden II
Reinforcement of Layer-Extrusion 3-D Concrete Printing by Freek Bos, TU Eindhoven
Smart Concrete, New Functionalities, and Nanotechnology
Nanotechnology has the potential to revolutionize the properties of concrete. Conversation in this session is designed to explore the impact of nanomodification on creating concretes with new functionalities, such as sensing and damage detection, self healing, energy harvesting, deicing applications, and so on. This session provides a unique opportunity for engineers, scientists, and industry leaders to learn and experience new concepts and novel research areas on the use of nanotechnology in cementitious materials and concrete.
Self Deicing and Strain Sensing Functionalities of Smart Concrete: Advanced Electrothermic Efficiency and Electromechanical Impedance Sensitivity by Maria Konsta, University of Texas at Arlington
Role of Nanosilica in Preparing Functionalized Concrete through Surface Treatment by Pengkun Hou, University of Jinan
Smart Acoustic Cement Sensors Incorporating Carbon Nanotubes by Shreya Vemuganti, University of New Mexico
Machine Learning Based Concrete Property Monitoring Through Nano-Sensors by Yenfang Su, Purdue University
UHPC – Innovations in Practical Applications
Ultra-high-performance concrete (UHPC) is seen as one of the most influential material innovations in the construction industry in the twenty-first century. Many research groups in academia or industry worldwide have developed UHPC mixtures, investigated their material properties and their structural behavior and thus have contributed to the increased interest in this type of material. While design guidelines are being drafted or have already been published the application of UHPC has been surpassed the stage of pilot projects in some areas. It seems that UHPC finds more and more ways into the construction industry beyond the "killer application" which was sought in the early days. This session will invite national and international research groups, material suppliers and contractors to share their knowledge in innovations in practical applications.
Innovative Precast Design Concept for Basins and Tanks Using Ultra High-Performance Fiber Reinforced Concrete with Enhanced Durability by Liberato Ferrara, Polytechnic University of Milan
Confining Concrete Column with Eco-friendly UHPC by Alessandro Fantilli, Polytechnic University of Turin
Applications of UHPC Vertical & Horizontal Panels by Vic Perry, ceEntek North America
A Reinforced Concrete Bridge Pier Strengthened with HPFRC Jacketing by Giovanni Plizzari, University of Brescia
Carbon Fiber Reinforced Concrete for Bus-pads by Rishi Gupta, University of Victoria
Unlocking Workability Issues of UHPC
Ultra-high-performance concrete (UHPC) is attracting increasing interests worldwide due to its superior mechanical properties and excellent durability. However, the difficulties in handling of UHPC has been increasingly recognized as a major problem during construction because of a significant workability reduction due to very low water-binder ratio (w/b) and very high dosages of fine powders (for example, silica fume) and admixtures (for example, water-reducing admixtures) used. It is well understood that mixing methods and procedures have more substantial effects on workability of UHPC than on those of conventional concrete. Ultra high performance could not be achieved if required workability of UHPC is not met. The main objective of this technical session is to uphold a platform to discuss the issues, challenges, and recent advances in characterizing, controlling, and improving workability of UHPC. It is also to promote broader dialogue and greater interactions between UHPC researchers and users.
Rheological Properties of UHPC by Weina Meng, Stevens Institute of Technology
Correlation Between "Very Early" Age Fracture Performance and Evolution of Rheological Properties of High Performance Fiber Reinforced Cementitious Composites with Adapted Rheology by Liberato Ferrara, Polytechnic University of Milan
Understanding the Workability of UHPC Mixture Designs by Marllon Cook, Oklahoma State University
Using Resonant Acoustic Mixing to Improve UHPC Workability by Aileen Vandenberg, Technische Universitat Braunschweig and Kay Wille, University of Connecticut
Particle-Scale Mechanisms and Rheological Response of UHPC by Narayanan Neithalath, Arizona State University
Impact of Chemical Admixtures on Time-Dependent Workability, and Rheological Properties of UHPC by Jiong Hu, University of Nebraska-Lincolny
Using ACI 318 PLUS as a Teaching Tool
This session will provide background on the creation of the new ACI 318 PLUS subscription along with guidance on how educators can navigate some of its key features and leverage it as a tool to improve students' understanding of reinforced concrete design. Discussion will be included to allow for brainstorming ideas on how this platform could better enhance teaching ACI CODE-318-19. Speakers include Michael L. Tholen, Ph.D., P.E and Trey Hamilton Ph.D., professor emeritus at the University of Florida.
Using ACI 318 PLUS as a Teaching Tool by Michael Tholen and Trey Hamiliton, American Concrete Institute
2021 ACI Fall Convention, Virtual Sessions
Advancing Concrete Durability, A Special Session Honoring Michael Thomas
This session will honor Michael Thomas, PhD, PEng, FACI, FICT, for his extensive contributions to advancing cement and concrete research, and his service to the concrete industry. Various industry leaders will discuss the impacts of the research conducted by Dr. Thomas and his students in the areas of supplementary cementitious materials (SCMs), alkali-silica reaction (ASR) mechanisms, mitigation, and testing; sulfate resistance; chloride-induced corrosion; and other areas of concrete durability.
Life-365: Stories and Choices About Development by Evan Bentz, University of Toronto
Relating ASR Lab Tests to Outdoor Exposure Site Performance - More Research is Needed by Benoit Fournier, Laval University
Our Biggest Practical Challenge: The reliability of Our Performance-Based Test Methods by Jason Ideker, Oregon State
Understanding How Supplementary Cementitious Materials Suppress ASR by Karen Scrivener, Ecole Polytechnique Fdrale De Lausanne
Contributions of M. D. A. Thomas to PCA Research by Michelle Wilson, Portland Cement Association
Durability Performance of Concrete Exposed to Harsh Marine Environments by Ted Moffatt, WSP
A Practical Guide to Life, Liberty, and the Pursuit of Concrete Durability (Sulfate Attack and DEF in Particular) by R Doug Hooton, University of Toronto
Tales From the Road by Kevin Folliard, University of Texas At Austin
Comments From Michael Thomas by Michael Thomas, University of New Brunswick
Applications of Alternative Cements
This session will provide state of the art discussion on the use of alternatives to Portland cement, with a focus on processes for upscaling the use of alternative cements (ACMs) and understanding beneficial applications in which ACMs can be used in lieu of Portland cement to create more durable, sustainable, and resilient concrete. The session targets both researchers working to advance understanding of ACMs and industry users (suppliers, producers, owners) interested in applying ACM technology to their work.
Reinforced Concrete Made with Belitic Calcium Sulfoaluminate Cement by Cameron Murray, University of Arkansas
OPC-CSAB Blends for Durable Rapid Repair Applications by Lisa Burris, Ohio State University
Standardizing Corrosion Assessment Methods for Alternative Cementitious Systems by Gokul Dev Vasudevan, Oregon State University
Architects' Day Lunch
Buildings alone account for 40% of the global greenhouse gas emissions. Two thirds of that total impact is from operational emissions while the remainder is from embodied emissions. Embodied emissions include all the emissions required to produce everything that goes into our buildings – the structure, enclosure and all the materials inside. Between now and 2050, half of the new construction emissions between now and then will be from embodied carbon. Therefore, the industry has begun to take action and groups like AIA 2030, Architecture 2030, SE2050, and USGBC have shifted their focus to include embodied carbon. In order to address this issue, we need to take steps to quantify and then reduce our impact. We can do this using a process called Whole Building Lifecycle Assessment (WBLCA). More and more project teams are using WBLCA as a design tool and are discussing decarbonizations strategies. As such, design professionals are actively and looking for low carbon material alternatives. Since cement is such a ubiquitous and carbon-intensive material, it is definitely at the center of these discussions. It's important that the concrete industry be aware of what is being discussed in the market and how this will affect our industry in the future as this trend grows. This presentation will also look at examples of how this translates to the design documents, the specifications and ultimately the concrete mix designs.
Embodied Carbon and the Concrete Industry: What you need to know by Kelly Roberts, Walter P. Moore Atlanta
Architects' Day Session
Our over-arching theme is "The Evolution of Concrete" where we will discuss sustainability, labor trends, and admixture/reinforcement, design and how they overlap and impact each other.
Optimized Pavement Design - TCP by Sherry Sullivan, FORTA Corporation
Enhancing the Performance of Plain Concrete at Significant Cost Savings by Luke Pinkerton, Helix Steel
An Introduction to Formliners by Layne Chastain, US Formliner
The Transformational Power of Concrete Stain by Dan McBride, Nawkaw
Concrete Through the Ages
This session is intended to introduce individuals to the historical aspects of concrete and concrete construction practices. Attendees will gain a greater understanding and appreciation of the development of the concrete industry.
History of Tall Buildings in Latin America by Richard Yelton, World of Concrete
A Look at One of the Earliest Concrete Pavement Overlays by Kurt Smith, Applied Pavement Technology, Inc.
A Brief History of Aluminum and Concrete by Anne Werner, Southern Illinois University Edwardsville
Why is the Splitting Tensile Strength Test Known as the "Brazilian Test"? by Jussara Tanesi, AET - American Engineering Testing
The Middle Road Bridge (1909): Canada's First Reinforced Concrete Arch-Truss Bridge by F Michael Bartlett, University of Western Ontario
Concrete With Recycled Materials
Concrete is the world's most widely used construction material. Yet, the production of portland cement, an essential constituent of concrete, leads to greenhouse gas emissions into the atmosphere. The production of 1 ton of portland cement clinker releases approximately one ton of CO2 and other greenhouse gases. Environmental considerations have been a major thrust for the sustainable development of the cement and concrete industries. A sustainable concrete structure is designed and built to have a positive environmental footprint during its entire life cycle. Concrete is increasingly being considered as a sustainable material owing to its low inherent energy requirements and little associated waste. Not only is it made from some of the most plentiful resources on Earth, it can also be made with numerous recycled materials and by-products and is itself entirely recyclable. Emerging breakthroughs in concrete technology have allowed producing ultra-high-performance concrete requiring less raw materials, along with structures that are much more durable to reduce maintenance, repair, and reconstruction.
Long-Term Field Performance of Ready-Mix Recycled Aggregate Concrete by Humera Ahmed, The University of British Columbia
Experimental Analysis of Cement Mortar with Varying Replacement Levels of Crumb Rubber by Rubaiya Rumman, The University of British Columbia
Mechanical Properties of Rubberized Recycled Aggregate Concrete by Kishoare Tamanna, The University of British Columbia
Effect of Shear Span-to-Depth Ratio on the Behavior of RAC Beams by Nariman Khalil, University of Balamand
Leaching Composition and Associated Microbial Community of Recycled Concrete Aggregates by Matthew P Adams, New Jersey Institute of Technology
Impact of Recycled Concrete Aggregate Parent Concrete Strength on Mechanical Properties of Recycled Aggregate Concrete by Noah Thibodeaux, New Jersey Institute of Technology
Evaluating Mechanical and Durability Performance of Recycled Plastic-Rubber Compound Modified Mortars with/without Tire Steel Fiber-Reinforcement by Qingli Dai, Michigan Technological University
HPFRC Made with Recycled Steel Fibers from End-of-Life Tires by Alessandro Fantilli, Polytechnic University of Turin
Long-Term Performance Evaluation of Concrete Pavements Containing Recycled Concrete Aggregate in Oklahoma by Xijun Shi, Texas State University
Design and Construction for LNG and other RLG Containment Structures
ACI 376-11/376M-11 Code Requirements for Design and Construction of Concrete Structures for the Containment of Refrigerated Liquefied Gases and Commentary was adopted by ACI in November 2011 and published in August 2013. The committee had been formed in 2003 at the request of the national Fire Prevention Association (NFPA) Technical Committee 59A on liquefied natural gas (LNG) for the purpose developing a code document that could referenced by NFPA 59A for design and construction of concrete containment structures. The scope of the Code includes not just LNG, but all refrigerated liquefied gases (RLG) where concrete is used for storage and containment. Upon completion of the first edition the committee began the work of addressing the future action items from the first edition, and other changes brought before the committee.
ACI 376 Code Revision by Rolf Pawski, Landmark Structures
Ground Motions for Performance-Based Seismic Design of LNG Tanks by Praveen Malhotra, StrongMotions Inc.
Navigating CFR 193 for the SSI Analysis of an Isolated LNG Tank: Challenges and Opportunities by John Powell, Arup Texas Inc.
Thermal Corner Protection Design and Detailing Requirements by Jeffrey Garrison, Chicago Bridge Iron
Graphene-Based Admixtures in Concrete
Graphene and its derivatives present a relatively new family of nanomaterials featuring unique quasi-2D layered structure. The thickness of single-layered graphene nanosheets is approximately 1 nm, while the median size of the lateral dimension is about 4 µm depending on the specific preparation method. Similar to carbon nanotubes and carbon nanofibers, graphene can be employed to endow cementitious materials with smart functionalities (e.g., by monitoring their stress-strain behavior). Recent laboratory studies have increasingly demonstrated that the oxygen-containing functional groups on the surfaces of graphene oxide (GO) and reduced GO make them a new type of multifunctional admixtures for cementitious materials. This session will bring to light to new frontiers and recent research findings and provide an opportunity to discuss the present challenges and technical issues. The session aims to engage a diverse group of distinguished speakers and serve to inspire researchers and practitioners who are interested in the use of graphene-based admixtures in paste, grout, mortar, and concrete.
Ultra-Sensitive Cement Sensor with In-Situ Growth CNTs by Mimi Zhan, The Hong Kong University of Science and Technology
Multifunctional Graphene/Cement-Based Sensors for Structural Health Monitoring by Wengui Li, University of Technology Sydney
The Role of Carbon-Based Nanostructured Materials on the Stress-Strain Sensing and Crack Detection of E-conducting Nanoreinforced Mortar by Panagiotis Danoglidis, University of Texas At Arlington
Effect of Graphene Oxide on the Properties of a Fly Ash-Based Geopolymer Paste Before and After F/T Damage by Zhipeng Li, Washington State University
Open Topic Session
The Open Topic Session is a forum for presenting recent technical information that could not be scheduled into other convention sessions.
Dominant Role of Cement Paste Content on Bridge Deck Cracking by Rouzbeh Khajehdehi, SJCA Inc.
Hydration Effects of Limestone Replacement in High Volume Fly Ash Concrete by Aniruddha Baral, University of Illinois Urbana-Champaign
ARCTEC (Additive Regulated Concrete for Thermally Extreme Conditions): Development of Multi-Parameter Guidance for Freeze-Protection Additive Dosage by Benjamin Watts, US Army Corps of Engineers
Effect of Tensile Strain Capacity of UHPC on the Bond with Steel Reinforcement by Amr Soliman, SUNY University of Buffalo
Investigation of Interface Shear Transfer in Engineered Cementitious Composites by Adham Abu-Abaileh, Bradley University
Fracture Characterization of Interfaces between Ultra-High-Performance Concrete and High-Performance Concrete by Ali Cicek, University of Delaware
Tensile and Shear Capacity of Post-Installed GFRP Bars in Concrete by Thomas DeMars, University of Minnesota Duluth
Early Detection of Alkali-silica Reactivity in Laboratory Concrete Prisms Using Ultrasonic Coda Wave Monitoring by Sina Mehdinia, Portland State University
Analytical Prediction of Cover Delamination Failure Mode of RC Beams Strengthened with FRP by Fahed Salahat, Kansas State University
Seismic Repair/Retrofit/Strengthening of Bridges at the Element or System Level
Major seismic events around the world along with the aging and deterioration of infrastructures keep increasing the need for repair/strengthening and rehabilitation of existing bridges. Seismic repairing and strengthening are an area that has seen major developments due to the availability of robust numerical simulation frameworks, large experimental facilities, structural health monitoring techniques, development of advanced materials and construction techniques, and sophisticated performance-based seismic design and assessment methodologies. Despite the progress, there are many challenges yet to be addressed. With the increase in transportation demand and more stringent seismic performance requirements, bridge retrofit, and repair is an important task for engineers and researchers. Bridge retrofits usually involve functional upgrades (such as deck widening) and seismic upgrades (such as strengthening seismic load path). The effects of the two upgrades are usually coupled and need to be analyzed. Therefore, more sophisticated analysis and customized solution is needed. While providing structural upgrade solutions to seismic issues, engineers also need to reduce the interruption to the traffic as much as possible. Development and implementation of innovative retrofit and repair methods are expected to upgrade deficient bridges to current standards and minimize traffic interruption. The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and practical examples of existing bridge retrofit and repair. This session will provide a forum for practicing engineers and researchers to share and discuss the various issues related to design and construction issues of seismic repair/retrofit/strengthening of bridges at the element and system level.
Seismic Retrofit and Quick Repair Technique for Bridge Columns Through Transverse Prestressing by Murat Saatcioglu, University of Ottawa
Shape Memory Alloy Based Dampers used for Seismic Retrofit of Continuous Bridges with Unequal Height Piers by Nailiang Xiang, Nagoya Institute of Technology
Rapid Repair of Reinforced Concrete Columns Using a Mechanically Fastened Steel Jacket by Taylor Brodbeck, North Carolina State University
Proposed Shear Design Equation and Reliability Analysis for Shear-Critical RC Beams Strengthened with Inorganic Composites by Tadesse Wakjira, The University of British Columbia
Rapid Repair of Hollow-Core FRP-Concrete-Steel Columns by Mohamed ElGawady, Missouri S&T
Multi-Column Bridge Bent Considering Different Jacketing Options by Abu Chowdhury, University of British Columbia
Precast Bridge Columns with Replaceable Components for Quick Repair by Mostafa Tazarv, South Dakota State University
Seismic Performance of Retrofitted and Repaired Bridge Column Under Major and Several Aftershocks by Saif Aldabagh, University of British Columbia
Full-Scale Evaluation of a Repair Measure of Earthquake Damaged Bridge Column by A K M Golam Murtuz, Portland State University
Behavior of UHPFRC Strengthened Bridge Piers Under Lateral Impact Loads by Gholamreza Gholipour, Lakehead University
Performance-based Seismic Assessment of Highway Bridges with Superelastic SMA Reinforced Piers and Restraining Devices by Shuai Li, The University of British Columbia
Bond and Development in New Types of Concrete and Reinforcement
Continuous developments in concrete technology and reinforcement materials have been made in recent years to improve the structural performance, durability and sustainability of reinforced concrete. The use of alternative types of concrete and/or reinforcement may affect the bond characteristics of reinforcing bars and, consequently, their development and lap-splice requirements. This session will present recent advances in the characterization of bond and development in new types of concrete and reinforcement, which may include (but are not limited to) ultra-high-performance concrete, fiber-reinforced concrete, self-compacting concrete, high-strength steel, corrosion-resistant reinforcement, and shape-memory alloy bars.
Bond Between Steel and Steel Fiber-Reinforced Concrete Under Normal and Elevated Temperature by Akanshu Sharma, University of Stuttgart
Bond Behavior of Carbon Fiber-Reinforced Polymers in Ultra-High-Performance Concrete by Nariman Khalil, University of Balamand
Compressive Bond Behavior of Shape Memory Alloy (SMA) Rebar in Concrete by AHM Billah, Lakehead University
Bond Behavior of Ribbed Iron-Based Shape Memory Alloy Bars Embedded in Concrete by Ghassan Fawaz, University of Texas at Austin
Bond-slip Behavior Between Geopolymer Concrete and Deformed Steel Bar by Maria Antonietta Aiello, University of Salento
Advances on Bond of Embedded Steel Reinforcement in the New Model Code 2020 by Giovanni Metelli, University of Brescia; Giovanni Plizzari, University of Brescia; and J. Cairns, Heriot-Watt
IBC-Compliant Concrete Construction & Laser Scans and Drones in Concrete Floor Construction
This presentation is on the use of laser scans and drones. It will describe a method of laser scanning a concrete surface to characterize the waviness of that surface and provide feedback to owners and concrete finishers. The comparative analysis of the various methods of measuring waviness in concrete slabs reveals that the 2-Dimensional (2D) Continuous Wavelet Transform (CWT) provides results that strongly correlate with those of the Waviness Index method (the current state of the art), but has numerous advantages over it and other existing methods. The next step in this study is to use this method in conjunction with augmented reality (AR) devices to enable the visualization of undulations corresponding to various characteristic periods on site. AR technology would provide visual information (3D laser scan data + ideal flat concrete surface) on surface waviness for comparison, which would enable timely decision making, and ultimately reduce project delays and extra costs associated with demolition and reconstruction.
Use of Laser Scans and Drones to Measure Concrete Floor Waviness/Flatness Automatically by Yelda Turkan, Oregon State
Open Topic Session, Part 1 of 2
The Open Topic Session is a forum for presenting recent technical information.
Use of Super Absorbent Polymers for Frost Resistance in Concrete Placed using Admixture-Based Freeze Protection by Danielle Kennedy, U.S. Army Engineer Research and Development Center; and Benjamin Watts, U.S. Army Engineer Research and Development Center
Correlation Between Test Methods to Characterize Tensile Behavior of UHPC by Daniel Bridi Valentim, University of Alabama; Sriram Reddy Aaleti, University of Alabama; and Michael Kreger, University of Alabamar
The Assessment of Interlayer Adhesion of Cold Joint in 3-D Printing Mortar by Kho Pin Verian, LATICRETE International, Inc.; Jarron Ashcroft, LATICRETE International, Inc.; Matthew Carli, LATICRETE International, Inc.; Randall Bright, LATICRETE International, Inc.; and Eerik Maandi, LATICRETE International, Inc.
The Effect of Gas Solubility on Water Sorption Rate in Cement-Based Materials Using X-ray CT by Laura Dalton, North Carolina State University; Karl Jarvis, U. S. Department of Energy National Energy; and Mohammad Pour-Ghaz, North Carolina State University
Flexural Performance of Reinforced Concrete Beams Fabricated with Ground Glass and Fly Ash by Ben Dymond, University of Minnesota Duluth; Mary Christiansen, University of Minnesota Duluth; and Nicholas Johnson, AMI Consulting Engineers
The Impact of Reinforcement Layers, Side Cover, and Bond Stress on Knee Joints Under Closing Moments by Hwa-Ching Wang, Purdue University; and Christopher Williams, Purdue University
Shear Testing of Prestressed Concrete Bridge Girders by Eva Lantsoght, Delft University of Technology & Universidad San Francisco de Quito; Gabriela Zarate Garnica, Delft University of Technology; Fengqiao Zhang, Delft University of Technology; and Yuguang Yang, Delft University of Technology
Damage Accumulation Resulting in Degradation of Strength and Stiffness in Concrete Subjected to Uniaxial Compressive Fatigue Loading by Somashekar Viswanath, University of Illinois at Urbana-Champaign; James Michael LaFave, University of Illinois at Urbana-Champaign; and Daniel Alexander Kuchma, Tufts University
The fabrication of novel reinforced concrete structures using digital technologies necessarily requires the definition of suitable strategies for reinforcement implementation. Reinforcement integration has to be compatible with either the specific printing technique adopted for the structural element production or with its shape. This Session aims to provide to engineers, architects and researchers actively involved or simply interested in 3-D printing with cementitious composites the latest updates on opportunities and techniques using "reinforced concrete" that have been developed so far in order to further expand the outreach of digitally fabricated concrete materials and structures.
Reinforcing 3-D Printed Concrete: The Missing Link by Jacques Kruger, Stellenbosch University; Gideon Van Zijl, Stellenbosch University; F A Bester, Stellenbosch University; M Van Den Heever, Stellenbosch University
New Reinforcement Concepts for Digitally Fabricated Concrete Structures by Jaime Mata-Falcón, ETH Zürich
High-Performance Concrete for 3-D Printed Precast Applications by M. Liard, Sika Technology; R. Bourquin, Sika Technology; and D. Lootens, Sika Technology
The Adaptation of Conventional Reinforcing and Anchoring Methods for Additively Constructed Concrete (ACC) by Eric Kreiger, U.S. Army Construction Engineering Research Laboratory
External Reinforcing System for 3-D Printed Concrete Elements: Technology and Design Approach by Costantino Menna, University of Naples Federico II; Ferdinando Auricchio, The University of Pavia; and Domenico Asprone, University of Naples Federico II
Early-Age Mechanical Performance of Fiber-Reinforced Mortars Used in 3-D Printed Concrete Construction by Liberato Ferrara, Politecnico di Milano; Marta Fioretti, Politecnico di Milano, Kasyapa Sriram Kompella, Politecnico di Milano, Laura Esposito, University of Naples Federico II; Costantino Menna, University of Naples Federico II; and Francesco Lo Monte, Politecnico Di Milano
Textile Reinforced Cement Composites ‐ New Applications and Repair Materials
Textile Reinforced Concrete (TRC) materials have been addressed several times at the ACI conventions in the past 14 years. This area has been led by several RILEM Committees, fib, and ACI Committee 549. The first TRC committee was formed in July 2002, the RILEM TC 201-TRC (Textile Reinforced Concrete). The work of this committee was followed by Technical Committee 232-TDT addressing Test methods and design of textile reinforced concrete, developing recommendations of test methods and design of the composites. ACI has had a very strong presence in the international development of these materials. Various research groups have developed a wealth of recent information pertaining the methodologies, properties, and areas of applications for fabric reinforced cement-based materials. The theoretical framework will address aspects of multi-scale modeling, analytical tools to predict and design components for tensile, flexural, and shear loading of TRC composite systems. these sessions would be of interest to researchers, structural engineers and concrete repair professionals.
Reinforced Concrete Columns Confined with FRCM: Experimental Performances, Analytical and Numerical Modeling by Salvatore Verre, University of Calabria
Design Formula for FRCM-Strengthened Masonry Elements Under Compression and Shear Load by Alessio Cascardi, University of Salento
Flexural Behavior of Carbon Fiber Textile-Reinforced Concrete I-Section Beams by Daniel Cardoso, Pontifical Catholic University of Rio de Janeiro (PUC-Rio); (Authors: Kissila Botelho Goliath, Daniel C. T. Cardoso and Flavio de A. Silva; Affiliations: Pontifical Catholic University of Rio de Janeiro (PUC-Rio)).
An Overview of the Tensile and Bond Behavior of Fabric-Reinforced Cementitious Matrix (FRCM) Composites by Gianmarco De Felice, Roma Tre University
Blast Retrofit of Stone Masonry Walls Using FRCM Composites by Hyunchul Jung, University of Ottawa
On the Synergetic Action between Strain-Hardening Cement-Based Composites (SHCC) and Carbon Textile Reinforcement Under Tensile Loading by Ting Gong, Dresden University of Technology
Influence of the Test Set-Up on the Bond Behavior of FRCM Composites by Angelo Savio Calabrese, Politecnico Di Milano
Utility of Glass and Carbon Fabrics in Ultra-High-Performance Cementitious Matrixes by Bekir Yilmaz Pekmezci, Istanbul Technical University
Carbon Reinforced Concrete Under Cyclic Tensile Loading by Arne Spelter, Institute of Structural Concrete at the RWTH
The Villa Horti Complex in Milan and the 25 Hours Hotel in Florence: Two Prestigious Buildings Entirely Retrofitted with FRCM and SRG Composite Materials by Paolo Casadei, Kerakoll Group
Architects' Day Session: Panel Discussion on Constructability
To demonstrate how effective teams overcome constructability challenges by utilizing the knowledge of the contractor, engineer, architect and owner.
Panel Discussion on Constructability by Chad Hensley, Wayne Brothers, Inc
Architects' Day Session: Shotcreting Architectural Concrete
To raise awareness about the technique of shotcreting vertical concrete elements with an architectural finish.
The Use of Architectural Shotcrete by Frank Townsend, Patriot Shotcrete, LLC
Benchmarking of Codes, Specifications, and Models for Service Life
The session is intended to present advances in service life modeling specially with respect to benchmarking of the available design codes to determine what service life can be anticipated when the structures are designed in accordance with the current prescriptive and/or deemed-to-satisfy requirements of the various countries' design codes and standards specifically for the chloride exposure. This may include service life modeling based on both accelerated laboratory testing and/or assessment of the existing structures. Further, benchmarking the currently available models on the chloride penetration into the concrete using real case studies is also a main objective of this session.
Performance Evaluation of Code Approaches in Durability Design of Concrete Structures by Richard Cantin, SIMCO Technologies, Inc
Long-Term Chloride Penetration Resistance of Silica Fume Concretes Based on Field Exposure by Doug Hooton, University of Toronto
Comparison of Various Service Life Models and Their Input Parameter Testing by Neal Berke, Tourney Consulting Group, LLC
Field Verification of Service Life Models of Existing Structures by Marwa Abdelrahman, Wiss, Janney, Elstner Associates, Inc
Service-Life Model Bench Marking Using Data Collected from Marine-Exposure Sites by Alessandro Fantilli, Polytechnic University of Turin
Concrete is the world's most widely used construction material. Yet, the production of portland cement, an essential constituent of concrete, leads to greenhouse gas emissions into the atmosphere. The production of 1 ton of portland cement clinker releases approximately one ton of CO2 and other greenhouse gases. Environmental considerations have been a major thrust for the sustainable development of the cement and concrete industries. A sustainable concrete structure is designed and built to have a positive environmental footprint during its entire life cycle. Concrete is increasingly being considered as a sustainable material owing to its low inherent energy requirements and little associated waste. Not only is it made from some of the most plentiful resources on Earth, it can also be made with numerous recycled materials and by-products and is itself entirely recyclable. Emerging breakthroughs in concrete technology have allowed producing ultra-high-performance concrete requiring less raw materials, along with structures that are much more durable to reduce maintenance, repair, and reconstruction
Fracture Properties and Restrained Shrinkage Cracking Resistance of Recycled Steel Fiber Reinforced Cement Mortars by Xijun Shi, Texas State University
Fresh, Mechanical, and Durability Properties of Steel Fiber-Reinforced Rubber Self-Compacting Concrete (SRSCC) by Jiaqing Wang, Michigan Technological University
Aggregate and Petrographic Laboratory (APL) Research Program by Mengesha Beyene, SES Group & Associates, LLC
The Effect of Hydraulic Cements on the Flexural Behavior of Wool Reinforced Mortars by Alessandro Fantilli, Polytechnic University of Turin
Performance of Concrete Containing Water-Hyacinth Ash (WHA) as Cement Replacement – Resistance to Elevated Temperature and Seawater Exposures by Ahmed Omran, New Jersey Institute of Technology & Massachusetts
Design of Structural Concrete Slabs for Safety Against Punching and Excessive Deflection
The symposium is on design of concrete slabs to sustain satisfactory serviceability over a long-life span. The goal is to guide on the design of relatively thin slabs needing no repair over a service life exceeding 100 years. Papers addressing vulnerability of slabs to excessive deflection or punching are invited.
Experimental Testing of a Real Scale Flat Slab Building for Gravity and Lateral Loading by Dario Coronelli, Polytechnic University of Milan
Application of Strip Model to Edge Column-Slab Connections with Outward Eccentricity by Scott Alexander, University of Alberta and Eva Lantsoght, Universidad San Francisco de Quito
Updates to ACI 421 Design Guides by Mustafa Mahamid, University of Illinois at Chicago
Effects of Internal Curing Using Pre-Wetted Lightweight Aggregates on Durability and Service Life of Reinforced Concrete Structures
There has been much discussion in ACI, and the concrete community in general, on the benefits of Internal Curing of concrete using pre-wetted lightweight aggregates. Internal curing can also be accomplished using other materials such as super absorbent polymers (SAP). This session, which is sponsored by committee 213, presents new research results on specific effects of internal curing, including: resistance to freezing and thawing; effects on self-consolidating concrete; results of electrical resistivity measurements; transport properties and pore water potential development; and corrosion-based service life prediction of reinforced concrete structures. These new papers are relevant to many aspects of concrete construction, including infrastructure projects. In order for the implementation of internal curing to continue to accelerate, the answers this session provides need to be widely disseminated. This is a direct reflection of the mission of Committee 213: "Develop and report information on mineral lightweight aggregates and structural lightweight concrete made with such aggregates." The speakers for this session have all been directly involved in the research being reported.
Freeze and Thaw Performance of Internally Cured Concrete by Rita Ghantous, Oregon State University
Coupled Effect of Lightweight Aggregate and Shrinkage Mitigation Strategies on Performance of SCC by Kamal Khayat, Missouri University of Science and Technology
Effects of FLWA- based IC on Electrical Resistivity Measurements by Armen Amirkhanian, University of Alabama
Improving Service Life of Reinforced Concrete Structures Using Internal Curing by Timothy Barrett, GCP Applied Technologies
Examples for the Design of Reinforced and Prestressed Concrete Members Under Torsion
This session will contain presentations about the design of reinforced and prestressed concrete elements for torsion. The focus is on practical design examples according to different concrete bridge and building codes. In addition to the design examples, presentations dealing with the current state-of-the-art on torsion in structural concrete, as well as recent advances in the analysis and design of concrete elements failing in torsion will be added.
The objectives of this session are to provide practicing engineers with the tools necessary to better understand and design concrete elements for torsion. Usually, the attention that is paid to torsion in engineering education is limited to simplified textbook examples. The examples in this session will show applications in bridges and buildings, where the torsion design is combined with the design for flexure and shear. Additionally, the examples will give insight in the different outcomes when using different bridge and building codes. Finally, the theoretical presentations will give practicing engineers a deeper understanding and background on torsion in structural concrete.
Design Example of Bridge Pier Cap Beam Considering Torsional Effect by Yang Yang, University of Hartford
Torsion Design Example: Prestressed Concrete Girder Bridge by Kevin Benitez, Polytechnic University of Milan
How Resiliency Impacts Concrete Design
With climate change, it's becoming increasingly challenging to anticipate every type and frequency of disruptive threats. Therefore, concrete structures need to be designed with resiliency in mind in order to respond, absorb, and adapt to a variety of disruptive event in order to maintain functionality during and after the event. During this session, we will explore topics related to designing resilient concrete structures. We will discuss potential threats, and the critical factors of resilient infrastructure. We will look at current resilience-based performance standards and resources. This session contains valuable information for designers, manufacturers, educators and specifiers.
Resiliency Based Performance Standards & Resources by Julie Buffenbarger, Beton Consulting Engineers, LLC
Current Resiliency Based Initiatives and Impacts on Concrete Design by Scott Campbell, National Ready Mixed Concrete Association
Enhanced Resilience: Notable Programs and Strategies by Stephen Szoke, American Concrete Institute
Industry Experience on Unusual Reinforcing Steel Corrosion
Awareness of atypical corrosion mechanisms and potentially corrosive environments can be useful for durable design and developing durability standards. It is known that corrosion of reinforcing steel can occur from excessive chlorides or carbonation. However, corrosion may also occur from less commonly known phenomena or unanticipated exposure (including building interiors). Conversely, some concrete may outlive expected service-life
Acid Tank Foundation Failure by Peter Bowlin, Ragland, Aderman & Associates, Inc
Issues and Potential Solutions for Achieving Uniform Dispersion of Nanoparticles in Cementitious Composites and Concrete for the Laboratory and Field
Nano particles designed for cement composites and concrete have been successfully used in laboratory and field applications over the last 20 years to enhance both the strength and durability of concrete. The following session will identify the dispersion of nano-based additives and admixtures for commercial concrete that focus on increase the strength and durability of concrete to physical and chemical attack. This session will emphasize concrete laboratory and field applications have been at the forefront of construction for the last decade. Pros and cons will be discussed in the to facilitate a realistic view for new solutions to ongoing issues.
Industrial Application of In-Situ Carbonate Nanoparticle Seeding by Sean Monkman, CarbonCure Technologies
Nano Silica-Enhanced Pavements—Paving the Way for a More Durable Concrete by Whitney Le Belkowitz, Intelligent Concrete
Relationship Between the Carbon Nanotube Dispersion State, Electrochemical Impedance and Capacitance and Mechanical Properties of Percolative Nanoreinforced OPC Mortars by Maria Konsta, University of Texas at Arlington
Amendment of Cement Paste with Low Concentrations of Well-Dispersed Partially Unzipped Carbon Nanotubes by Shohana Iffat, University of South Carolina
Role of Dispersion Degree of Nanoclays In Controlling Viscoelastic Properties of Fresh Cement Pastes by Ala Eddin Douba, Columbia University
Alkali-Silica Reaction-Affected Reinforced Concrete Elements Subjected to Pure Shear by Anca-Cristina Ferche, University of Toronto
Resilient Seismic Retrofit of Non-Ductile Code-deficient Reinforced Concrete Shear Walls: Experimental Study by Sina Basereh, University at Buffalo
NCHRP 51-13: Synthesis - Load Rating of Bridges and Culverts with Missing or Incomplete As-Built Information by Harry "Tripp" Shenton, University of Deleware
Linking Pore Solution Chemistry of Concrete to ASR Potential Through Machine Learning as a Performance Based Approach by Pravin Saraswatula, Affiliation: Texas A&M University
Recommendations for Modelling Lightly Reinforced Concrete Walls using PERFORM-3D by Anahid Behrouzi, California Polytechnic State University
Recent Advances in Understanding Mechanisms of Mass Transport in Concrete
Durability of concrete is directly related to the ability of concrete to impede the transport of water and aggressive species such as chlorides. Transport can occur under different mechanisms and often more than one mechanism is involved. Accurate modeling and measurements of transport requires understanding of the mechanisms involved. This session aims to provide the recent advances in measuring and modeling mass transport in concrete with implications on service life prediction of reinforced concrete structure subjected to a variety of degradation mechanisms.
Transport in Concrete – Using the Formation Factor Effectively by Keshav Bharadwaj, Oregon State University
Using X-Ray CT to Understand Greenhouse Gas and Water Migration in Cement-Based Materials by Laura Dalton, North Carolina State University
Transport in Concrete – Modeling Reactions by O Burkan Isgor, Oregon State University
Relating Water Permeability to Electrical Resistivity and Chloride Penetrability of Concrete Containing Different Supplementary Cementitious Materials by Caitlin Tibbetts, University of Florida
Imaging of 3-D Flow Phenomena in Cement-Based Materials Using X-Ray CT and Electrical Capacitance Tomography by Moe Pour-Ghaz, NC State
Characterization of Transport Properties for Service Life Prediction by Elizabeth Wagner and Joshua White, Wiss, Janney, Elstner Associates, Inc
Recent Research into the Design, Analysis and Testing of FRP Reinforced Columns
The session theme is the performance and design of FRP reinforced columns. In this session, the latest research addressing experimental and analytical research findings on the FRP-RC columns. A large part of the body of knowledge of FRP reinforced structures addresses the performance of beams and slabs. A comparatively limited number of studies investigated columns. The dissemination of research into the performance of FRP-RC columns is necessary to help advance design codes and, consequently, wider adoption of FRP bars in construction.
Proposed Slenderness Limit for GFRP-RC Columns Based on Experiments and Buckling Analysis by Waseem Abdelazim, University of Sherbrooke
CFRP Reinforced Concrete Columns under Eccentric Loading by Murat Saatcioglu, University of Ottawa
Seismic Response of Concrete Columns Internally Reinforced with GFRP by Shamim Sheikh, University of Toronto
Nonlinear Moment-Curvature Response and Ductility of Hybrid Reinforced Concrete Columns by Sherif Osman, University of British Columbia
Shear Strength of Hollow-Core FRP-Concrete-Steel Columns by Mohamed ElGawady, Missouri University of Science and Technology
Research in Progress, Part 1 of 2
This session will feature presentations of original, unpublished results from ongoing research projects and leading-edge concrete technology and research throughout the world.
Combined Effect of Chloride and Sulfate Ions in Cement-based Materials by Alvaro Paul, Universidad de los Andes, Chile
Assessment of Gradient Inelastic Flexibility-Based Theory for Shear-Critical RC Members by Mohammad Aghajani Delavar, Texas A&M University College Station
Experimental and Analytical Investigation of Concrete Subjected to Variable Amplitude Fatigue Loading by Somashekar Viswanath, University of Illinois Urbana-Champaign
Stainless Steel Strands for Pretensioned Concrete Girders by Anwer Al-Kaimakchi, Florida State University
Behaviour of UHPFRC Subject to Pure Shear by Brittany Yap, University of Toronto
Retrofit of Existing Foundation to Convert Traditional RC Wall into Rocking Wall Using Ultra High-Performance Concrete (UHPC) by Sumedh Sharma, University of Alabama
A Thermodynamics-based Framework Production of Porous Lightweight Aggregate (LWA) from Waste Coal Combustion Ash (W-CCA) by Mohammad Balapour, Drexel University
Evaluation Quality of 3D Printed Clay Objects Using a 3D Structured Light Scanning System by Kwangwoo Wi, Iowa State University
Synergistic Effects of Air Content and Supplementary Cementitious Materials in Reducing Damage in Concrete Exposed to High Concentrations of Deicing Salt and Various Temperature Conditions by Nima Hosseinzadeh, University of Miami
Performance of Corrosion Inhibitors in Lab and Field Testing by Bruno Fong-Martinez, 'the University of Texas at Austin
SDC Innovations in Concrete: Sustainability, Constructability, and "Cost-ability" – The New Three-legged Stool?
The word "sustainability" leads one immediately towards factors such as carbon emissions and renewable energy. But the true aim of sustainability, represented by the "three-legged stool", is to find the balance between environmental impacts, economic costs, and the social benefits of any action taken. As we work to lessen the environmental impact associated with concrete construction, we often lose sight of the balance sustainability truly seeks. The goal of being "green" is often in direct conflict with either constructability, cost, or both. If sustainability is becoming more environmentally centric, is it necessary to start thinking of constructability and cost as being the other two legs of a new "three-legged stool"? How, as an industry, do we meet our goals of being good stewards of the environment while being mindful that a green design is of little social value if it cannot be constructed at a reasonable cost? In this session the speakers will discuss the design and construction challenges of being "green" while also trying to meet the necessary goals of constructability and "cost-ability".
Concrete Construction Practices that Meet Current Development Needs Without Compromising the Future by John Hausfeld, Baker Concrete Construction, Inc.
Sectional Shear Strength Analysis and Strengthening Design of Garage Post-Tensioned Beams and Girders by Kurt Tyler, Wiss, Janney, Elstner Associates, Inc.
Unlikely Green Champions: How Concrete Suppliers and Structural Engineers Can Lead the AEC Industry to a Low Carbon Future by Emma Reif and Patrick Kenny, Thornton Tomasetti
SDC Innovations in Concrete: Sustainability, Constructability, and "Cost-ability" – The New Three-legged Stool? - Panel Discussion
Sessions Honoring Calvin McCall
These are special sessions honoring a long time Carolinas Chapter member (and ACI Honorary member), Calvin McCall. The focus of the sessions includes specifications, workable concrete mixtures, and constructability.
30 Years of Writing and Enforcing Specifications: A Journey from Conservative Specifications to Progressive Specifications to Realistic Specifications by Henry B Prenger, LafargeHolcim
Durability Performance Testing: The Devil is in the Details by R Doug Hooton, University of Toronto
ACI Specification Writing Process by James Cornell, JN Cornell Associates, LLC
Large Format Tiles and Floor Flatness Specifications by Ronald Kozikowski, North S.Tarr Concrete Consulting, P.C.
Initial Curing of Concrete Test Cylinders by Frank A Kozeliski, Kozeliski Consulting LLC
Performance: Starting with the End in Mind, for Work, Organizations, Homes, and Relationships by Kenneth Hover, Cornell University
So You Think You Can Print? Challenges to 3-D Printing from Design to Permitting
3-D printing has garnered a lot of excitement in the concrete community due to its potential benefits for the concrete construction (cost reduction, construction time reduction, and design freedom). However, it's not as easy as it looks. This session will provide an overview of 3-D printing and discuss the common challenges and advice on how to avoid them.
Digital Construction: An Ongoing Exploration on Design and Development of Printable Mixture and Printing Process by Maryam Hojati, University of New Mexico
Real-Time Extrusion Quality Monitoring Techniques for Construction 3-D Printing by Ali Kazemian, Louisiana State University
Scaling Construction 3-D Printing by Alex Le Roux, ICON
Steel Reinforced Digitally Fabricated Concrete Beams: Technology and Experimental Assessment by Costantino Menna, University of Naples Federico II
Building Code Compliance of 3-D Concrete Walls Constructed Using 3-D Printing Construction Technology in the U.S.A. by Mahmut Ekenel, ICC Evaluation Service, LLC
Considerations for Deploying Additive Construction by Eric Kreiger, U.S. Army Engineer Research and Development Center
State-of-the-Art Evaluation of Signature Concrete Bridges
The session objective is to present state-of-the-art and emerging methodologies for the strength or serviceability evaluation of signature concrete bridges. Bridge designers, inspectors, owners, leading industry experts, students, and academicians should attend the session. The potential list of topics includes, but is not limited to: load testing at or beyond service, use of load testing for load rating or maintenance, advanced numerical or computational analysis, structural versus element rating, determination of structure specific reliability indices, use of continuous monitoring for detecting anomalies, novel inspection techniques.
Condition Evaluation and Monitoring for Management of Post-tensioned Segmental Concrete Bridges by Michael Brown, WSP USA
A Case Study - Marquette Interchange Pier TS7 by Tony Shkurti, HBTB Corp
GCRTA Special Bridge Inspection: Instrumentation, 3D FEM Calibration, and Analysis of an In-Service LRT Bridge by Kent Dickens, HDR, INC
Use of Advanced Bridge Evaluation Techniques for the Blatnik Bridge by Andrew Foden, WSP USA
Technologies to Reduce Shrinkage and Cracking
This session will review the use of current technologies available to reduce shrinkage in concrete, including mineral and chemical admixtures and various alternative approaches in concrete mixture designs. Cracking due to restrained shrinkage is one of the primary contributors to cracking, particularly in concrete flatwork, which potentially reduces the service life and increases the required long-term maintenance of concrete structures. Mitigation of different shrinkage mechanisms in concrete can be accomplished through combinations of shrinkage reduction technologies. A review of how these technologies affect concrete properties and shrinkage behavior will be presented. Completed research and full-scale field observations will examine the effectiveness of an array of shrinkage reduction technologies.
From Design to Reality - How to Significantly Reduce Shrinkage and Cracking Using Fibers by Samhar Hoz, International Code Council
High Performance Concrete Containing SCMs and LWA for Internal Curinge by Yuguo Zhong, University of Michigan
Evaluation of a Modified ASTM C157 for Early-Age Volume Change in Concrete by Matthew O'Reilly, University of Kansas
The Intersection of Bond, Development Length, and Anchorage
The provisions for anchorage in ACI 318 (Ch. 17) have found increasing use for questions involving reinforcement anchorage, although an explicit formulation of splitting resistance is lacking. Conversely, the provisions for bar development, which focus primarily on concepts of bond and splitting, do not directly consider breakout failure modes that may be decisive, particularly in closely spaced bar groups. The use of, e.g., headed bars in groups terminating in sections with small edge distance, and the extensive use of reinforcing as anchorage in nuclear construction have raised questions about the adequacy of current provisions to provide adequate safety margins for all cases.
This session will focus on recent work to understand the behavior of reinforcing bars used for anchorage with respect to failure modes and predictive models, including cast-in reinforcing, post-installed reinforcing, high-strength reinforcing, straight bars, bars with mechanical anchorage (headed bars), and hooked bars. Behavior in normal weight, HPC, fiber-reinforced, and other concrete variants is included. The committee is asking for contributions that reflect both experimental, analytical, and code development work in this area.
Behavior and Design of Connections Between Column and Foundation with Cast-in and Post-Installed Reinforcing Bars by Rolf Eligehausen, University of Stuttgart
Anchorage of Groups of Straight Bars in Plain Concrete by Amit Varma, Purdue University
Column-Foundation Connections with Cast-in-place Headed Anchors by Jack Moehle, University of California, Berkeley
The Case for a New Approach to Anchorage in the Code by John Silva, Hilti North America
Use of Slag Cement in Concrete Construction
This session will provide industry insight from SCA representatives on how slag cement is being used to create more durable, sustainable, and resilient concrete.
The Influence of Slag on Reducing Concrete Pavement Joint Deterioration by W Jason Weiss, Oregon State University
Demonstrating Resilient and Sustainable Concrete Benefits with Slag Cement by Shawn Kalyn, St. Marys Cement
Why Nanofibers in Concrete?
This session intends to introduce to the concrete industry a new development on using nanofibers for several applications in concrete. Researchers the possible use of nanofibers to enhance cement hydration, add new functionalities (e.g., sensing and energy harvesting) and improve mechanical properties of concrete using nanofibers. Research has also shown the ability of new types of nanofibers to facilitate 3D-printing of concrete. Through this distinguished group of diverse speakers, this session will introduce to concrete researchers, engineers, suppliers, and contractors, how nanofibers are opening new frontiers in concrete technology.
Utilization of Cellulosic Nanofibers for the Performance Enhancement of Portland Cement-based Materials by Warda Ashraf, University of Texas-Arlington
Energy Harvesting Cementitious Materials through Nanofiber Incorporations by Yen-Fang Su, Purdue University
Expanding Working Domain of Cement Based Matrices via Molecular Scale Engineered C-S-H by Konrad Krakowiak, University of Houston
Corrosion Damage Detection of Reinforced Concrete Modified by Carbon Nanotubes and Carbon Nanofibers by Panagiotis Danoglidis, University of Texas At Arlington
3-D-Printed Polymer Concrete Using Carbon Nanofibers by Mahmoud Reda Taha, University of New Mexico
Mechanical and Microstructural Properties of Cement Pastes with Rice Husk Ash Coated with Carbon Nanofibers Using a Natural Polymer Binder by Nima Farzadnia, Missouri University of Science and Technology
2019 ACI Spring Convention, Quebec City, Canada
Advanced Analysis and Testing Methods for Concrete Bridge Evaluation and Design
The session objective is to present state-of-the-art and emerging technologies for the strength evaluation and design of concrete bridges using advanced computational analysis and load testing methods. The following topics are considered: advanced nonlinear modeling and nonlinear finite element analysis (NLFEA), structural versus element rating, determination of structure specific reliability indexes, load testing beyond the service level, load testing to failure, and use of continuous monitoring for detecting anomalies.
Inelastic Shear Distribution in Prestressed Concrete Girder Bridges by Ben Dymond, University of Minnesota Duluth; Carol Shield, University of Minnesota; and Catherine French, University of Minnesota
Evaluation of the Orientation of Concrete Finishing Machines in Skewed Bridges Using Finite Elements by Brandon Gillis, Faress Hraib, Saint Louis University; Li Hui, Saint Louis University; and Riyadh Hindi, Saint Louis University
Using Nonlinear Finite Element Analysis for Bridge Evaluation: Challenges and Perspectives by Mahdi Ben Ftima, Polytechnique Montreal; Bruno Massicotte, Polytechnique Montreal; and David Conciatori, Universite Laval
Advanced Numerical Modeling Methodology for Strength Evaluation of Deep Bridge Bent Caps by Serhan Guner, University of Toledo; and Anish Sharma, University of Toledo
Seismic Simulation of Bridges Considering Bending and Torsion Interaction by Yang Yang, University of Hartford
Seismic Performance of Unreinforced Concrete Railroad Bridge Piers by Qiang Gui, University of Tennessee, Knoxville; and Zhongguo John Ma, University of Tennessee
Monitoring and Assessment of a Prestressed Concrete Segmental Box-Girder Bridge by Jean-François Laflamme, Bridge Department, Québec Ministry of Transportation; and Marc Savard, Bridge Department, Québec Ministry of Transportation
Instrumentation, Monitoring, and Load Testing of a 50-Span Large Precast Prestressed Concrete Bridge: The Champlain Bridge by Dominic Lavigne, Jacques-Cartier Champlain Bridge Corporation
Estimation of the Rebar Strength in Existing Concrete Bridges by Alessandro Fantilli, Politecnico di Torino; and Bernardino Chiaia, Politecnico Di Torino
Challenges and Opportunities for Scaling Additively Manufactured Concrete from Lab to the Field
This is the second session, as a continuation from the session was presented in Las Vegas in Fall 2018. Interest in additive manufacturing (AM) or three-dimensional (3-D) printing is growing tremendously among different ACI committees. The session for Las Vegas was "Materials Science Aspects in Additive Manufacturing of Cementitious Binders" and dealt with fundamental materials science and processing of such systems. The session for Québec City presents challenges and opportunities for scaling of AM of concrete. The session will provide novel information to researchers, engineers, concrete producers, robotic system designers, and contractors to take AM from the lab to the field.
3-D Concrete Printing by Selective Deposition—Requirements for Fresh Concrete and Testing by Viktor Mechtcherine, Dresden University of Technology; and Venkagtesh Nerella, Dresden University of Technology
Opportunities for Customization of Concrete Structures Using 3-D Printing Technology by Jan Olek, Purdue University; Reza Moini, Purdue University; Pablo Zavattieri, Purdue University; and Jeffrey Youngblood, Purdue University
Mixture Design and Early-Age Mechanical Behaviour of 3D Printable Concrete by Manu Santhanam, Indian Institute of Technology Madras
Modeling of Extrusion-Based 3D Printing of Cementitious Materials by Narayanan Neithalath, Arizona State University; Gaurav Sant, University of California, Los Angeles; Pu Yang, Arizona State University; and Sooraj Nair, Arizona State University
Effects of Extreme Events on Reinforced Concrete Columns
The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and field examples. This session will provide a forum for practicing engineers and researchers to share and discuss various issues related to design and construction issues of RC columns under extreme events. This session aims to provide a platform to demonstrate the performance of reinforced concrete columns for buildings or bridges during extreme events such as earthquake, tsunami, vehicular impact, corrosion, high temperature differential, freezing-and-thawing cycles, and ice load impact. Challenges from inspection to design and constructions will be discussed and possible solutions to improve their performance will be debated.
Composite Action of Circular Concrete-Filled FRP Tube Columns under Lateral Cyclic Load by Ahmed Mohammed Hassan Ali, University of Sherbrooke; and Radhouane Masmoudi, University of Sherbrooke
Seismic Fragility Analysis of Deteriorating Recycled Aggregate Concrete Bridge Columns Subjected to Freeze-Thaw Cycles by Kaihua Liu, Harbin Institute of Technology; Jiachuan Yan, Harbin Institute of Technology; Chaoying Zou, Harbin Institute of Technology; and Shahria Alam, University of British Columbia
Effects of Seawater Exposure for One Year on Hollow-Core Fiber-Reinforced Polymer (FRP) Confined Concrete Cylinders Subjected to Severe Environmental Conditions by Song Wang, Missouri University of Science and Technology; and Mohamed ElGawady, Missouri University of Science and Technology
Effect of High-Strength Reinforcement and Fibers on the Blast Performance of HSC Columns by Hassan Aoude, University of Ottawa
Comparison of Damage Mechanisms of CFRP-Strengthened Reinforced Concrete Columns Subjected to Blast, Impact, and Quasi-Static Loads by Husham Almansour, National Research Council Canada
RC Columns Subjected to Reinforcement Corrosion under Sustained Load by Samer Jabbour, Halsall Associates Limited; Beatriz Martín-Pérez, University of Ottawa; and Arnaud Vadeboncoeur, University of Ottawa
Beam-Column Connection for Concrete Filled FRP Tubes by Ahmed M. Ali, University of Sherbrooke; and Radhouane Masmoudi, University of Sherbrooke
Fiber-Reinforced Self-Consolidating Concrete: From Development to Use
The results of 12 multi-axial compression tests performed on cylinders made of self-consolidating concrete, plain (SCC) and reinforced with steel fibers (FR-SCC), are presented in this paper. In the experimental campaign, four "reference" confining pressures (0, 1, 3 and 10 MPa) were applied on the lateral surface of the specimens. After the first stage of loading, when a hydraulic stress was applied to the cylinders, and progressively increased up to the value of a pre-established confining pressure, a longitudinal compressive load was used to generate crushing of concrete. During this failure, the post-peak behavior of SCC and FR-SCC can be defined by a non-dimensional function that relates the inelastic displacement and the relative stress during softening. Such a function also reveals the ductility of SCC, which increases with the confinement stress and with the fiber volume fraction. By adding 0.9% in volume of steel fibers, FR-SCC can show practically the same ductility measured in unreinforced SCC with 1 MPa of confining pressure. Thus, the presence of an adequate amount of fibers in SCC columns is sufficient to create a sort of distributed confinement.
Ductility of Fiber-Reinforced Self-Consolidating Concrete under Multi-Axial Compression by Alessandro Fantilli, Politecnico di Torino; and Bernardino Chiaia, Politecnico Di Torino
Hot Topic Session: Durability of Concrete: Aggregate Matters and Alternative Test Methods
Deleterious chemical reactions of aggregates in concrete are among the various mechanisms that can conduct to regular or recurring repairs or eventually the replacement of the affected elements/structures. Assessing concrete degradations in structures starts with a reliable diagnosis process performed by a concrete professional. Alkali-aggregate reaction (AAR) or any other aggregate degradation mechanism is a gradual process and determining the current condition and the potential for further damage is rather complex. Testing methods for accurate condition assessment and determination of reaction stage are limited and a deep understanding of the reactions involved and of their impact on the mechanical properties of the affected concrete are crucial in this process. Testing methods for prognosis are generally performed under accelerated laboratory conditions and their correlation with field exposure is often not very accurate. Relatively "new" reactions in concrete such as internal sulfate attack associated with sulfide-bearing aggregates need better understanding and also methods to detect reliably and accurately reactive aggregates. Therefrom, relatively new/upgraded test methods (petrographic and mechanical) for diagnosis of current level of damage due to AAR or other aggregate reactions are presented in this session. Results on the correlation between field exposed concrete blocks and laboratory results for the prevention of AAR are also presented accompanied by new information on the challenges of evaluating the deleterious potential of sulfide-bearing aggregates.
Challenges in Determining the Deleterious Potential of Sulfide-Bearing Aggregates in Concrete by Josée Duchesne, Laval University; Benoit Fournier, Laval University; Andreia Rodrigues, GHD; Julie Francoeur, Transport Québec; Benoit Durand, IREQ – Hydro-Québec; and Medhat Shehata, Ryerson University
Mechanical Tools to Assess Damage in Concrete Affected by AAR and Combined Mechanisms by Leandro Sanchez, University of Ottawa
Outdoor Exposure Site Testing for Preventing Alkali-Aggregate Reactivity in Concrete—A Review by Benoit Fournier, Laval University; Jan Lindgård, SINTEF Building and Infrastructure, Børge Wigum, Heidelberg Cement Northern Europe; and Ingmar Borchers, Verein Deutscher Zementwerke e.V. Forschunginstitut der Zementindustrie
Innovative Techniques for Monitoring and Evaluating Concrete Bridges and Bridge Elements
This session examines the latest techniques and technologies for both monitoring and evaluating concrete bridges and bridge elements. This includes both superstructure elements such as bridge decks, barriers, and main spanning girder elements as well as substructure elements including bridge pier bents, piers, and foundations. The session for Québec City deals with innovative techniques for monitoring and evaluating concrete bridges and bridge elements. The session will provide novel information to researchers, engineers, educators, students, and contractors.
Emerging NDE Methods for Evaluating and Monitoring Bridges by Larry Olson, Olson Engineering, Inc.
Experimental Dynamic Load Allowance of a Prestressed Concrete Bridge by Eli Hernandez, Missouri University of Science and Technology
Condition Assessment of Bridges in the United States by Elizabeth Nadelman, Wiss, Janney, Elstner Associates, Inc.; Mohamed ElBatanouny, Wiss, Janney, Elstner Associates, Inc.; Todd Nelson, Wiss, Janney, Elstner Associates, Inc.
Measurement and Control of Workability in Concrete In-Transit Mixers
During delivery of ready mixed concrete, the slump may change depending on a host of variables. However, the slump is typically known only at the batch plant or job site. This session explains the concepts used for the measurement of several properties (such as workability and volume) of fresh concrete directly in the drum of the concrete truck. Also, the adjustment of slump while in transit is discussed, incorporating experiences of concrete producers that have adopted this new technology. Lastly, researchers will present studies on the economical and practical aspects of slump measurement.
COMMANDassurance: In-drum Measuring System, an RMX Producer's Perspective by Bradley Burke, PB Materials
Environmental and Economical Assessment of an Integrated Probe by Mélodie Hilt, Laval University; and Marc Jolin, Laval University
In-Drum Measurement Systems by Denis Beaupré, Command Alkon
In-Transit Concrete Management by Nathan Tregger, GCP Applied Technologies
Verifi—The Ready Mix View by Kirk Deadrick, ARGOS
Phase Change Materials in Concrete
Phase change materials (PCMs) have been widely incorporated in building envelops to regulate the indoor temperature. Recent studies have shown that PCMs have other potentials in civil engineering applications, including thermal cracking mitigation in mass concrete, freezing-and-thawing damage control, snow melting, and thermal fatigue retardation. This session will address the efficiency of various stabilization forms of PCMs, the effects of PCMs on concrete properties, and modeling methods. Researchers and engineers considering PCMs as a manner to control temperature change-related problems of concrete should attend. Learn the strategies and details of using PCMs to manage temperature change in concrete.
How to Integrate Phase Change Materials in Construction Materials by Moncef Nehdi, Western University; and Afshin Marani, Western University
Microstructure-Guided Numerical Simulation to Evaluate the Influence of Phase Change Materials (PCMs) on the Thermal Response of Concrete Pavements by Sumeru Nayak, University of Rhode Island
Are Micro-Capsulated Phase Change Materials Efficient for Thermal Energy Management of Concrete Structures? by Yaghoob Farnam, Drexel University; and Mohammad Balapour, Drexel University
Mitigating Curling of Concrete Pavement by Phase Change Materials: Incorporation, Measurement, and Modeling by Hongyan Ma, Missouri University of Science and Technology; and Wenyu Liao, Missouri University of Science and Technology
UHPC and UHPFRC: Innovations in Combining High Tensile Strength and High Ductility
In comparison to conventional concrete, high-performance concrete (HPC) and ultra-high-performance concrete (UHPC) are characterized by higher compressive strength and enhanced durability due to their optimized cementitious matrix design. The addition of fiber reinforcement and tailoring the bond properties between matrix and fibers allow for enhanced tensile strength and tensile ductility leading to the concept of ultra-high-performance fiber-reinforced concrete (UHPFRC). Enhanced material properties under tensile loading provide opportunities for innovative and novel structural designs. This session will invite national and international research groups as well as contractors and designers to share their innovations in material tensile strength and tensile ductility of HPC and UHPC, also known as high-performance fiber-reinforced cementitious composites (HPFRCC) or ultra-high-performance fiber-reinforced concrete (UHPRC).
Results from Pure Shear Test on UHPFRC by Evan Bentz, University of Toronto; Frank Vecchio, University of Toronto; Brittany Yap, University of Toronto; and Stephen Foster, University of New South Wales
Tensile Behavior of UHPFRC with Nano-Scale Functionalizing Constituents for Structural Applications in Extremely Aggressive Environments Characterized by Chlorides and Acids by Liberato Ferrara, Politecnico di Milano
Visual Condition Survey of Concrete and Case Studies
This session is on state-of-the-art guidelines to conducting a visual condition survey of concrete in service. Attendees will learn of the visual condition survey process, distress features of concrete, as well as in which context they manifest: construction-related defects and distress due to improper placement, finishing, and curing practices; design- and service-related distress due to loading, moisture, and temperature conditions; and durability-related distress due to various mechanisms. Presentations of case studies complemented with nondestructive testing (NDT) techniques are also planned.
Visual Inspection of Earthquake Affected Structure: A Case Study—Gujarat 2001 by Er. Aniruddha Nakhawa, Structural Engineer Project Consultant
Utilizing New Technology to Provide Comprehensive Visual Assessment of Cooling Towers and Other Difficult-to-Access Structures by Glenn Schaefer, Structural Technologies
Visual Condition Survey of an Underground Tunnel Structure Affected by External Sulfate Attack by Julie Ann Hartell, Oklahoma State University
2019 ACI Fall Convention, Cincinnati, OH
Assessment of Concrete Prior to Rehabilitation
The session will include presentations of case studies that focus on the assessment of concrete structures. The presentations are intended to provide insight into the practical use of the new ACI "364.1R Guide for Assessment of Concrete Structures before Rehabilitation"; and how to use with other new ACI documents that relate to repair of concrete.
Sampling and Testing of Concrete as Part of an Assessment (ACI 364.1R, Chapter 6) by Benoit Bissonnette, Laval University
Assessment and Repair of a Precast Parking Deck with Construction Defects by Kyle Stanish, Klein and Hoffman
Evaluation of Concrete Prior to Rehabilitation by John Lund, Martin/Martin Consulting Engineers
Evaluation and Assessment of Concrete Prior to Rehabilitation by David VanOcker, CVM
Concrete Constructability: River of Knowledge
The design of a concrete pavement system for a low traffic volume extends beyond the process of pavement thickness selection; it entails an understanding of the processes and the factors that affect pavement performance. It also encompasses appropriate slab jointing and construction practices that are consistent with local climatic and soil conditions. This session will be for designers, specifiers, and owners of pavement assets. Attendees will learn about the revised ACI report 325.12R, other methods available to design concrete streets, how construction specifications and materials requirements for local roads may differ from highway roads, and maintenance and rehabilitation requirements for low volume roads.
Tunnels in Paradise by Mark Hirschi, Baldridge & Associates Structural Engineering
Constructability: Determining the Effectiveness of Curing Concrete by Tyler Ley, Oklahoma State University
Providing Expectations of Tilt-Wall Surfaces by Anthony DeCarlo, TWC Concrete Services LLC
How Good is Laser Scanning? byWilliam Paul, BKF Engineers, Inc.
Accounting for Tolerances within ADA Design Criteria by Peter Ruttura, Ruttura & Sons Construction
Design and Construction of Concrete Streets and Local Roads
The session will present new research, specification changes, and knowledge gained thru experience as it applies to constructing in concrete, and educate members of our industry so they can utilize knowledge to produce a better concrete product.
Investigating and Characterizing Soils for Use in Local Road Concrete Pavement Design by Brian M. Killingsworth, National Ready Mixed Concrete Association
Cement Based Pavement Design Methods and Tools for the Practitioner by Eric Ferrebee, American Concrete Pavement Assoc (ACPA)
Construction and Jointing of Local Concrete Roads: State of the Practice by Amanda Hult, National Ready Mixed Concrete Association
Concrete Overlays for Streets and Roads by Peter C. Taylor, National Concrete Pavement Technology Center
Fire and Flood Design, Performance, Mitigation, and Strengthening for Concrete Bridges
Recent years have shown the potential vulnerability of concrete bridges to fire and flood hazards. Bridge fires can be caused by crashed or overturned vehicles, arson, accidents or wildfire, while flooding can be due to coastal storm surge or inland riverine and flash events. While provisions for fire and flood safety are requirement for building design, essentially no such requirements exist for concrete bridges. The proposed session will include presentations on topics related to design, performance, mitigation, and strengthening of concrete bridges for such hazards. Academic, industry and agency representatives should attend this session.
Post-Fire Flexural Testing and Rating of Prestressed Concrete Bridge Girders by Nur Yazdani, University of Texas at Arlington; and Eyosias Beneberu, Bridgefarmer & Associates
Application of Concrete Spalling Mitigation by Kevin Mueller, Thornton Tomasetti; Stephen M. Stacey, Jensen Hughes; and Anthony F. Bentivegna, Jensen Hughes
Coastal Bridges Under Hurricane Stresses along the Texas and Louisiana Coast by R. Nasouri, A. Matamoros, F. Testik, A. Montoya, University of Texas at San Antonio
Hot Topic Session: Do We Have a Sustainable and Scalable Material to Address Carbon Steel Corrosion Once for All?
The major challenge to the durability of reinforced concrete structures exposed to chlorides is the corrosion of the carbon steel reinforcement. The current-state-of practice utilizes different strategies to address this problem such as: use of admixtures or supplemental binders in the concrete mixture and increase of cover or surface protection by membranes. Additionally, carbon steel may be coated with epoxy or replaced by more corrosion resistant alloys. The purpose of this hot topic session is to show practitioners, researchers, and students the availability of composite reinforcement that, rather than delaying the corrosion problem, totally resolves it with a material system (i.e., glass fiber reinforced polymer) that is validated, included in standards (i.e., design and materials specs) and readily available.
Standardization, Guide Development and Long-Term Durability of Fiber Reinforced Polymers (FRP): An Overview of FRP Advancements through ACI Activities by John Myers, Missouri University of Science and Technology
GFRP Reinforcing: An Engineer's Perspective by Richard F. Bertz, The Mannik & Smith Group, Inc
International Workshop Session: Changes in ACI 318-19
The 2016 Kaikoura earthquake in New Zealand resulted in shaking in excess of design level demands for buildings with periods of 1 to 2 seconds at some locations in Wellington. This period range correlated to concrete moment frame buildings of 5 to 15 stories, many of which had been built in Wellington since the early 1980s, and often with precast concrete floor units. Varying degrees of beam hinging and residual beam elongation were observed. Cases of significant beam elongation and associated support beam rotation resulted in damage to precast floor unit supports—in one case leading to loss of support for double-tee units. The deformation demands also resulted in damage to floor diaphragms, especially those with hollow-core floor units. Cracking in floor diaphragms was commonly concentrated in the corners of the buildings. Transverse cracking of hollow-core floor units was identified as a particular concern. Following the earthquake, a guideline was developed for the seismic assessment of existing buildings with precast floors. This presentation will discuss damage from the Kaikoura Earthquake and the implementation of seismic assessment guidelines for buildings with precast floors in New Zealand.
Damage to Concrete Buildings with Precast Floors during the 2016 Kaikoura Earthquake by Kenneth Elwood, University of Auckland
International Workshop Session: Concrete Construction in the Middle East
Construction in the Middle East has many unique challenges. Many areas have extreme high temperatures, low humidity, constant winds, and sulfates in the soils. Areas near the Gulf and Red Seas have corrosion issues from the sea water. This area has had a building boom and is home to some of the tallest buildings in the world. These presentations will discuss how the challenges on construction in the Middle East have been met and how the ACI 318 Code provides the guidance for successful design and construction.
Special Construction Considerations in the Middle East by Charbel Aoun, Advanced Construction Technology Services (ACTS)
Overview of Codes and Standards in Saudi Arabia by Ahmed Shuraim
International Workshop Session: Design of Super-Tall Reinforced Concrete Structures
Concrete has become the structural engineers' material of choice for high-rise construction around the world. The majority of tall buildings constructed today feature either primary structural systems utilizing all reinforced concrete or a composite system utilizing a combination of reinforced concrete and structural steel. Of the current twenty tallest competed buildings in the world, 19 utilize composite or reinforced concrete structural systems; and the only structural steel system on the top 20 list has a completion date prior to 1975. An even better indicator is that of the 20 tallest buildings completed in 2018, all utilized composite or reinforced concrete systems (data as per the Council of Tall Buildings and Urban Habitat, www.ctbuh.org). Reinforced concrete construction has an inherent advantage for tall building design, in that it provides a substantial amount of stiffness, and mass and damping for the structural; three factors that are critical in controlling building motions and accelerations. This session demonstrates the use of reinforced concrete as it pushes to new heights across the globe.
Recent Supertall Concrete Towers in the Middle East by Robert Sinn and John Peronto, Thornton Tomasetti
Concrete Pushes Mexico to New Heights by Roberto Stark, Stark & Ortiz, S.C.
Novel Techniques and Advances in Load Testing Concrete Structures
The presentations will introduce new techniques in load testing of concrete structures. Such techniques include load testing structures where shear is the expected covering limit state, and where nondestructive testing or monitoring supplements load test results.
Load Testing of Existing Structures: Case Studies and Lessons Learned by Brian Greve, Wiss, Janney, Elstner Associates, Inc.
Load Testing – Changes in ACI 318-19 – Integration and Coordination between Committees by Keith Kesner, CVM Engineers
Load Test of a Precast Concrete Tub Stadium Riser and Bond Testing of #20 Bar by Jeremiah Fasl, Wiss, Janney, Elstner Associates, Inc.
Load Testing After Strengthening of a Pre-stressed Double Tee Beam that had Failed in Shear by Nestore Galati, Structural Technologies
Development of Database for Structural Load Tests by Mohamed ElBatanouny, Wiss, Janney, Elstner Associates, Inc.
Prestressed Concrete with Conventional and Nonconventional Materials
Professor Hiroshi Mutsuyoshi of Japan Prestressed Concrete Institute is co-moderating a special session focused on the recent advancement of prestressed concrete for bridges and structures using conventional and nonconventional materials. Presentations and technical papers will include the conceptual development of innovative prestressed concrete, laboratory experiments, numerical modeling, and case studies. State-of-the-art prestressing techniques and nonconventional materials such as fiber reinforced polymer (FRP) composites to address the sustainable performance of concrete members will also be considered. The session will benefit practicing engineers, government officials, and academics.
Pretensioned Bent Caps to Improve Substructure Design and Performance by Anna Birely, Texas A&M University
Recent Advances in Prestressed Concrete in Korea by Jae-Hoon Lee, Yeungnam University
On the Application of Basalt-Fiber Reinforced Polymer (BFRP) Bars to Prestressed Slab Elements Typical of the Precast Concrete Industry by Liberato Ferrara, Politecnico di Milano
Use of Flexible Filler in Post-Tensioned Bridges by Natassia Brenkus, The Ohio State University
UHPC – Innovations and Changes in Structural Design
Ultra-high-Performance concrete (UHPC) is one of the most promising material innovations in the construction industry in the 21st century. Innovations in material design led to enhanced material properties allowing for innovative and novel structural designs using UHPC. This includes structural elements and structures fully or partially made out of UHPC. National and international research groups and contractors and will share innovations and changes in structural design and performance of UHPC elements. The session has been chosen for the ACI convention in Cincinnati, OH to spread "A River of Knowledge" of advanced structural design utilizing UHPC. Sharing academic knowledge and practical experiences about innovative structural designs using UHPC will facilitate the acceptance and application of the material in U.S. construction.
Achieving High Strength, Ductility, and Durability in Flexural Members Reinforced with Fiber-Reinforced Polymer Rebars by Using UHP-FRC by Shih Ho Chao, University of Texas at Arlington
UHPC for Repair of Steel Piles by Mohamed A. ElGawady, Missouri S&T
Reinforcement Anchorage and Bond – Slip Laws for UHPC Structures by Stavroula J. Pantazopoulou, York University, Canada; Konstantinos Tsiotsias, York University; and Katerina D. Papoulia, University of Waterloo
Effect of Fiber Reinforcement on the Tensile Behavior of Rebar Reinforced UHPC by Kay Wille, University of Connecticut
2018 ACI Spring Convention, Salt Lake City, UT
Concrete Modulus of Elasticity—How High is High
The requirements for achieving sufficient modulus of elasticity (MOE) of concrete is increasing not only for high-rise structures, but also for concrete precast/prestressed components and repair application. However, achieving high modulus of elasticity, while maintaining good workability, pumpability, and consolidation of concrete is of challenge for concrete producers and contractors. Key factors affecting MOE include mixture design, rheological properties, and construction practices also influence in-place MOE and its homogeneity. Testing of MOE of high-performance concrete also requires special attentions to achieve reliable data. The session will be beneficial for engineers, specifiers, concrete producers, contractors, and academic communities.
A Tall Building Engineer's Perspective on Specifying Modulus of Elasticity by Robert C. Sinn, Thornton Tomasetti Inc.
An Overview of Factors Influencing on Concrete Modulus of Elasticity by Van K. Bui, BASF Construction Chemicals
Producing High-Modulus-of-Elasticity Concrete—Meeting Specification and Contractor Expectations by Nicholas J. Beristain, Votorantim Cimentos
Testing the Limits of Concrete Modulus of Elasticity in Chicago by Walter H. Flood IV, Flood Testing Labs Inc.
Uncoupling Modulus of Elasticity and Strength—Effect of Small Addition of Carbon Nanotubes on Concrete Properties by Surendra P. Shah, Northwestern University
Contractors' Day Session: Concrete Construction
The presentation will address construction, forming, mixture design, transportation, and engineering challenges faced in extreme conditions.
Hidden Peak Snowbird Resort by Jon Brinkerhoff, Layton Construction; and Sam Koceja, Altaview Concrete
Controlling Fresh Properties of SCC for Adequate Placement (238)
Self-consolidating concrete (SCC) is known to be more sensitive to changes in constituent elements, mixture design, and mixing procedure, which can have significant consequences on placement. Especially controlling the water content, including the moisture content of the sand, is a challenge, limiting the practical implementation of SCC. This session will reveal different strategies to control the variation in fresh properties, making the session suitable to material producers, contractors, engineers, owners, and academics. This session, participants will be informed on: variations in concrete constituents, mixture design, mixing, transportation, and placement procedures influencing fresh SCC properties; which countermeasures can be taken to control these variations; the importance of an adequate quality control system for the successful implementation of SCC; and future perspectives in actively controlling fresh SCC properties.
The Perfect SCC Project by G. Terry Harris, GCP Applied Technologies
Monitoring SCC Performance During Production and Determining Adjustments by Joseph A. Daczko, BASF Corporation
Robustness of Self-Consolidating Concrete Incorporating Different Viscosity-Enhancing Admixtures by Kamal H. Khayat, Missouri University of Science and Technology
Breaking the Ice: Controlling SCC in Hot Weather by Lloyd Keller, EllisDon Corporation; and Stacia Van Zetten, EllisDon Corporation
Fiber-Reinforced Concrete—From Fresh Properties to Structural Design: New Tools, Guides, and Reports
During the past 3 years, ACI Committee 544 has developed five new documents addressing the testing and fresh concrete properties, mechanical properties, back calculation of tensile properties, structural design with fiber-reinforced concrete (FRC), design of elevated slabs with FRC, and design of precast tunnel lining with FRC. These published reports (ACI 544.6R, 544.7R, 544.8R, 544.9R, and 544.3R) are currently available for the engineering community and offer a completely fresh way to use, design, and implement FRC in a variety of applications. The purpose of this course is to dedicate a presentation to each document addressing its content, how the specific topics of documents interact with each other, as well ways to implement and incorporate the knowledge in these documents in the design and specification. The speakers are the members of the committee who were the primary authors of the documents.
An Overview of the Document ACI 544.6R-15: Report on Design and Construction of Steel Fiber-Reinforced Concrete Elevated Slabs by Xavier Destree, Xavier Destree Ltd. .
An Overview of the Document ACI 544.7R-16: Report on Design and Construction of Fiber-Reinforced Precast Concrete Tunnel Segments by Mehdi Bakhshi, AECOM
FRP Design Methodology and Applications for Blast and Impact-Resistant Structures
ACI Committee 370 and ACI Subcommittee 440-F are jointly developing the standard "Blast Design Guidelines for Externally Bonded FRP Applications" to provide guidance for designing concrete and masonry wall panels with an application of fiber-reinforced polymer (FRP) that are subject to blast loading. The opening presentations in this two-part session will provide an overview of the proposed standard, while covering some basic blast design practices and introducing the underlying single-degree-of-freedom (SDOF) analysis methodology. Subsequent presentations will discuss alternate slab analysis approaches, as well as FRPs used as column reinforcement, catching systems, and anchors within a blast- and/or impact resistant design. Focused talks on FRP detailing and FRP manufacturers' insights will also be presented.
Design of FRP Catcher Systems for Blast Loads by John E. Crawford, Karagozian & Case, Inc.
Advanced Modeling of Blast Response of Reinforced Concrete Walls with and without FRP Retrofit by Tarek H. Kewaisy, Louis Berger; and Ahmed Khalil, Applied Science International, LLC
CFRP Retrofit of Concrete Columns by Alan Lloyd, University of New Brunswick
A Practical Perspective on the Use of Advanced Composites for Blast Mitigation by Scott Arnold, Fyfe Co. LLC
New Innovations in Chemical Admixtures
Chemical admixtures is one of the fastest growing and innovative areas of concrete construction currently. This session will highlight new admixture technology and how these new admixtures bring value to concrete by improving plastic and hardened properties, providing improved economy, and changing the limits on how concrete can be used as a constructible material. Attendees will be provided with knowledge about chemical admixtures and how and where to use them effectively.
Introduction to What's New in Chemical Admixtures by Kari L. Yuers, Kryton International Inc.
A Chemical Admixture with Carbon Nanotubes by Yuan Gao, Northwestern University; David J. Corr, Northwestern University; and Maria S. Konsta-Gdoutos, Northwestern University
Use of Polymeric Microspheres for Providing Resistance to Freeze-Thaw and Salt Scaling by Michael D. A. Thomas, University of New Brunswick; and Edward G. Moffatt, University of New Brunswick
New Generation of High-Range Water Reducers by Suzanne Lianopoulos, BASF; and Thomas M. Vickers, BASF
A New Generation of Micro-Particulate-Based Admixtures for Concrete by Christopher John Eagon, BASF; and Paul Horst Seiler, BASF Corp.
Quality Management: The Common Thread of Good Practice
The importance of quality and quality standards include reference to ISO 9001. Beyond the technical aspects, the practice of quality management is about people, relationships, and processes that can have a huge impact on results. Where does one find this type of content, and who will be so bold as to start this discussion? These topics are discussed in many committee meetings where of the most passionate debates revolve around them and how industry stakeholders work together. The concrete industry will benefit from a healthy discussion in a public forum on QMS implementation. The hosting of various speakers, topics, and perspectives will help to engage subject matter experts, highlight practices, and impact other committee documents.
Quality Control of Silica Fume Concrete Bridge Decks by Thomas G. Tyler, Skanska USA Civil Northeast
Rating Methods for Defining Performance of Existing Concrete Bridges
The main objective of this session is to provide an overview of methodologies for rating existing concrete bridge components including bridge deck, superstructure, and substructure, using both LRFR and LFR approaches. Presentations will include case studies of load rating concrete bridges with various structural configurations such as typical prestressed I-girders, reinforced and prestressed multi-cell box girder bridges, segmental concrete bridges, bridges with large horizontal curvatures and complex geometry (for example, concrete arch and rigid frame bridges), and bridges with insufficient plans or details. Presentations will also emphasize relevant refined analysis methods that extend beyond traditional AASHTO rating methods such as finite element modeling, grillage modeling and diagnostic load testing. This session will be of interest to bridge owners, operators, design engineers, and researchers.
Load-Rating Strategies for Bridges with Limited or Missing As-Built Information by Mehrdad Dizaji, University of Virginia; Mohamad Alipour Tabrizi, University of Virginia; Devin K. Harris, University of Virginia; and Osman Eser Ozbulut, University of Virginia
Condition Assessment and Load Rating for a Cracked Widened Bridge by Nestor R. Rubiano, HNTB Corporation
Load Testing: Not Just for the Big Bad Bridges by Andrew J. Foden, WSP USA; and Zachary James Van Brunt, WSP USA
Load Rating of 87-Year-Old Reinforced Concrete Tee Beam Bridge by Farhad D. Panthaki, TranSystems Corporation
Repair of Concrete Session in Memory of Tony Murray
This session is a concrete repair session to honor the contributions of Tony Murray (who passed in 2016) to ACI and the concrete repair community. Tony was Chair of ACI Committees 503, 546, and 563, and a member of CLC, TAC, 364, 503, 546, 562, 563, and TRRC. He was a Fellow of ACI and speaker over many years at ACI concrete repair seminars. He was also an engineer, materials expert, and owned a structural concrete repair construction company. The session will include speakers from the concrete repair and materials community and the topics that reflect Tony's wide range of knowledge in concrete repair and materials.
Structural Concrete Repairs: Engineering Principals and Everyday Best Practice by Bruce A. Collins, Restruction Corporation
Structural Repairs Using Preplaced Aggregate Concrete by John S. Lund, Martin/Martin, Inc.
Lessons Learned from a Master in Concrete Repair (Tony Murray) by Gene R. Stevens, JR Harris & Co Structural Engineers; and Jim Harris, JR Harris & Co Structural Engineers
Post-Tensioning Repairs and Modifications by Pete Barlow, Contech Services, Inc.
Reinforcement Corrosion, No Perfect Solution by Fred R. Goodwin, BASF
Seismic Repair and Retrofit of Concrete Bridges
Bridges are essential components of transportation systems. The failure and damage of bridges not only affects its immediate users, but also brings serious aftermath to earthquake events. With the increase in transportation demand and more stringent seismic performance requirements, bridge retrofit and repair is an important task for engineers and researchers. Bridge retrofits usually involve functional upgrades (such as deck widening) and seismic upgrades (such as strengthening seismic load path). The effects of the two upgrades are usually coupled and need to be analyzed. Many of the existing bridges do not meet the requirements in current design codes and thus cannot be analyzed using standard methods. Therefore, more sophisticated analysis and customized solution are needed. While providing structural upgrade solutions to seismic issues, engineers also need to reduce the interruption to the traffic as much as possible. Development and implementation of innovative retrofit and repair methods are expected to upgrade deficient bridges to current standards and minimize traffic interruption. The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and practical examples of existing bridge retrofit and repair. This session will provide a forum for practicing engineers and researchers to share and discuss the various issues related to design and construction issues of existing bridges.
Rehabilitation of Longitudinal Joints of Double-Tee Bridges by Lucas M. Bohn, South Dakota State University; Mostafa Tazarv, South Dakota State University; and Nadim I. Wehbe, South Dakota State University
Rapid Repair of Hollow-Core FRP-Concrete-Steel Columns by Mohamed A. ElGawady, Missouri University of Science and Technology; Ahmed Gheni, Missouri University of Science and Technology; and Sujith Anumolu, Missouri University of Science and Technology
Fragility Analysis of Retrofitted Multi-Column Bridge Bent Subjected to Near Fault and Far Field Ground Motion by Abu Hena Billah, University of British Columbia; and Shahria Alam, University of British Columbia
Seismic Repairing of a Seismically Damaged Bridge Column with Low-Grade GFRP Material by M. Shahria Alam, University of British Columbia
Settlement Cracking from Theory to Practice
Settlement of concrete is a phenomenon that takes place during the early hours after concrete is cast. This can be a problem in structures having top bars where the settlement of the fresh concrete around the reinforcement can cause cracking and/or a weak plane right above the reinforcement. This session includes presentations providing explanations from research studies and actual projects on the topic of concrete settlement, tests methods developed to measure this phenomenon, and techniques available to reduce it.
Settlement of Fresh Concrete: Using Neutron Radiography to Quantify the Influence of Mixture Proportions by Mehdi Khanzadeh Moradllo, Oregon State University; and W. Jason Weiss, Oregon State University
Surface Settlement of SCC—How Critical is it on Concrete Performance? by Kamal H. Khayat, Missouri University of Science and Technology
Dealing with Plastic Settlement Cracking: Case Studies and Lessons Learned by Oscar R. Antommattei, Kiewit Engineering Group
How to Reduce Settlement Cracking in Reinforced Concrete by Muzai Feng, University of Kansas; Rouzbeh Khajehdehi, University of Kansas; David Darwin, University of Kansas; and Eman Khalid Ibrahim, University of Kansas
The Role of Cracking on Corrosion of Reinforced Concrete
Cracking is often considered detrimental to the corrosion resistance of reinforced concrete structures, but the magnitude of this effect is less clear. Crack size, location, and depth all may affect the impact of cracking on corrosion, and there is debate as to whether small cracks are detrimental to corrosion resistance. Presentations will highlight recent research into the effect of cracking on corrosion resistance of concrete and the effectiveness of crack mitigation/repair. This session will be of interest to contractors, engineers, and owners who wish to learn how cracking can impact the service life of structures they design, build, and use.
Chloride Ingress at Cracks by Neal S. Berke, Tourney Consulting Group, LLC
Influence of Cracks on Corrosion Initiation of Corrosion Resistant Reinforcement by Soundar Sriram G. Balakumaran, Virginia Department of Transportation; Michael C. Brown, WSP USA; and Richard E. Weyers, Associated Materials Engineers
Effect of Early-Age Cracking on Corrosion Initiation in Reinforced Concrete by James D. Lafikes, University of Kansas; David Darwin, University of Kansas; Matthew O'Reilly, University of Kansas; and Omid Farshadfar, Thornton Tomasetti
Performance of Cracked High-Performance Concrete in a Harsh Marine Environment by Edward G. Moffatt, University of New Brunswick; Andrew Fahim, University of New Brunswick; and Herwing Lopez-Calvo, University of New Brunswick
Effect of Cracking on Reinforced Concrete Corrosion by Brian M. Pailes, Rutgers University
2018 ACI Fall Convention, Las Vegas, NV
Blast Resistance of Precast Concrete
This session will provide ACI members an overview of research performed through private and industry funding over the last decade. Presentations will highlight full-scale, high-explosive and shock tube test programs, analysis methodologies, and design response limits. This session is appropriate for researchers, practitioners, and students.
Testing and Analysis of Precast Concrete Wall Panels by Marlon Bazan, Protection Engineering Consultants; and Charles Oswald, Protection Engineering Consultants
Open-Air Blast Testing of Large Prestressed Concrete Slabs by Jason Florek, Stone Security Engineering
Unified Performance-Based Blast-Resistant Design Methodology for Precast Concrete Insulated Wall Panels by Matthew Gombeda, Lehigh University; Clay Naito, Lehigh University; and Spencer Quiel, Lehigh University
Blast Response Limits for Load-Bearing Prestressed Concrete Panels by Thomas Mander, University of Texas at San Antonio
Effect of High Strain Rates of Reinforced Concrete Bond by Eric Jacques, Virginia Polytechnic Institute and State University
Constructability: From Definition to Industry Practice
This session presents constructability review perspectives from the different parties: design professionals, construction managers, concrete contractors, and ready mix producers. All industry professionals should attend to learn how each party views their responsibility for a constructability review and how that interacts with the other parties' constructability review.
An Introduction and Overview to ACI 134 Constructability Committee by Jim Cornell, JN Cornell Associates LLC
What is Constructability? by John Hausfeld, Baker Concrete Construction Inc.
Use of Heavy Equipment on Existing Bridges during Constructionby Kyle Eyre, Kiewit
Constructability of Elevating Concrete Slabs on Grade by Anthony Lamanna, Arizona State University
When Structural Concrete is Architectural Concrete by Kevin MacDonald, Beton Consulting Engineers LLC
403 N Wabash—Innovative Tower Crane Support Scheme for a Challenging Urban Site by Eamonn Connolly, James McHugh Construction Co.
History of Concrete
This session, includes presentations of historical aspects of concrete and concrete construction practice. Attendees will gain a greater understanding and appreciation of the development of the concrete industry.
How Did North America's First Portland Cement Concrete End Up in Halifax Harbour? by Sean Monkman, CarbonCure Technologies Inc.
CSI of Girl Encased in Concrete by Megan Huberty, American Engineering Testing
Who is Carl Menzel? by Anne Werner, Southern Illinois University Edwardsville
History of the Hard Hat by Luke Snell, Western Technologies
Hot Topic Session: Busting 90 Minutes
The ASTM C94 90-minute time limitation has been around for over 80 years and committee members are now discussing its removal! The committee is now reviewing current science and modern design techniques for concrete mixtures by considering the time limit to be determined by the specifier and/or ready mix producer. This session will explain why this proposed change is being debated and give examples of scenarios showing expanded time limits of 2 or more hours. We'll show how the pot-life of concrete can be extended without harm and why the typical 90-minute limit has become an antiquated standard. Examples of successful projects will illustrate the capabilities possible where longer time limits have been implemented.
90 Minutes: Love It or Lose It? by G. Terry Harris, GCP Applied Technologies
Evaluation of the 90-Minute Rule as an Acceptance Criteria by Mohamed Mahgoub, New Jersey Institute of Technology; and Wayne Rawlins, New Jersey Institute of Technology
Extending Concrete Slump Life: ProvenTechnologies and Projects with Challenging Placements by Mark Bury, BASF Admixtures Inc.
Hot Topic Session: Can Codes and Standards Improve the Performance and Longevity of Existing Concrete Structures?
Over the past 30 years, concrete repair professionals have recognized a need to improve the performance of concrete repair practice. Various references indicate that approximately 50% of concrete repairs fail within a period of 10 years. The premature failure of concrete repairs creates a series of problems, including:
Safety risks associated with potential falling debris hazards
Risks associated with unsafe structures
Costs in the billions of dollars associated with the repair and re-repair of concrete structures
The concrete industry has developed several new standards and codes specifically to improve the design side of concrete repair practice. These include ACI 562, Concrete Repair Code; ACI 563, Concrete Repair Specifications; and ACI 437.2, Standard for Load Testing of Existing Concrete Structures. While the ACI 562 code is gaining acceptance at the state level, it has not been adopted into the International Existing Building Code, largely because of resistance from some anti-code design professionals. The hot topic session will aim to explore five viewpoints on how to improve concrete repair practice from the perspective of design professionals, contractors, and academics.
It Is All on the Contractors by Carl Larosche, Wiss, Janney, Elstner Associates, Inc
It Is All About Academic Instruction by Lawrence Kahn, Georgia Institute of Technology School of Civil and Environmental Engineering
Adoption of ACI 562 into IBC/IEBC by Keith Kesner, CVM Professional
Unifying ACI 318 and ACI 562 into One Code, "ACI 880" by Tracy Marcotte, CVM Professional
Materials Science Aspects Related to Digital Manufacturing (3-D Printing) of Cementitious Materials
The field of digital manufacturing (3-D printing) of concrete is rapidly evolving. An understanding of material properties and processing related parameters, and how they influence the properties of three-dimensional (3-D) printed structural components, is essential to ensure further advances in this nascent field. The proposed sessions will provide new information on selection of binder materials and combinations for successful 3-D printing; rheological characterization of cementitious materials as applied to digital manufacturing; the role of interfaces in the plastic and hardened stages; and microstructural architectures achievable by digital manufacturing to enable novel, multi-functional cementitious composites with special properties. This session will be valuable for researchers and students, and industrial entities interested in digital manufacturing and material processing.
Rheological Control of 3D Printable Cement Paste and Mortars by Scott Jones, National Institute of Standards and Technology; Dale Bentz, National Institute of Standards and Technology; Nicos Martys, National Institute of Standards and Technology; and William George, National Institute of Standards and Technology
How the Rigidity-To-Thixotropy Transition in Rheology Affects the Shape Stability of Dense Suspensions? by Iman Mehdipour, University of California, Los Angeles; Gaurav Sant, University of California, Los Angeles; H. Atahan (ITU); and N. Neithalath (ASU)
Mechanical Response and Micro-CT Characterization of 3D Printed Cement Paste Elements with Controlled Architecture by Jan Olek, Purdue University; Mohamadreza Moini, Purdue University; Pablo Zavattieri, Purdue University; and Jeffrey Youngblood, Purdue University
Microstructural Packing, Rheology, and Ram Extrusion Characteristics of 3-D-Printable Cementitious Binders by Sooraj Nair, Arizona State University; Aashay Arora, Arizona State University; Hussam Alghamdi, Arizona State University; and Narayanan Neithalath, Arizona State University
Approaches to Producing Additively Manufactured Concrete Mixtures by Raissa Ferron, University of Texas at Austin
Seismic Rehabilitation—From Analysis to Practical Application
This session will present the latest advances in seismic rehabilitation of existing concrete buildings that have come out of recent research projects and experiences from recent earthquakes around the world. The session will present results of evaluation studies applied to existing structures using current ASCE 41, ACI 369.1R-17, or other local seismic evaluation and retrofit standards. Attendees will also be presented with information on recent research results of laboratory experiments of retrofitted structural components. An overview of ongoing activities within ACI 369 to update the ACI 369.117 standard will also be presented.
Guidance on Nonlinear Modeling of RC Buildings by Laura Lowes, University of Washington
Overview of the NIST-ATC Project on Benchmarking of Evaluation Methodologies for Existing Buildings by Siamak Sattar, National Institute of Standards and Technology
Evaluation of Seismic Assessment Procedures for Existing Reinforced Concrete Structures Damaged in the 2016 Meinong Earthquake by Laura Lowes, University of Washington; Dawn Lehman, University of Washington; and J. Sumearil, University of Washington
ASCE 41 versus TEASPA: Comparison of Seismic Evaluation Results of RC Frame Buildings Damaged During 2016 Meinong Earthquake, Taiwan by Jiun-Wei Lai, University of California, Berkeley; ShyhJiann Hwang, National Taiwan University; Insung Kim, Degenkolb Engineers; Daniel Zepeda, Degenkolb Engineers; Garrett Hagen, Degenkolb Engineers; and Kirk Johnston, Degenkolb Engineers
Performance of a Nonductile RC Building for the FEMA P695 Far-Fault Ground Motion Data Set, by Adolfo Matamoros, University of Texas at San Antonio; Andres Lepage, University of Kansas; Anil Suwal, University of Texas at San Antonio
Ongoing Activities for Future Updates of the ACI Standard 369.1-17 by Insung Kim, Degenkolb Engineers; Sergio Brena, University of Massachusetts; Adolfo Matamoros, University of Texas at San Antonio; Garrett Hagen, Degenkolb Engineers; and Arne Halterman, Holmes Culley
Quantifying Benefits of Seismic Retrofitting Gravity Columns Using CFRP Jackets Based on Nonlinear Modeling Parameters per ACI 369.1 by Saeed Fathali, Structural Technologies; Bill Graft, ImageCat; and Mohammad Jalalpour, Structural Technologies
Seismic Evaluation of Beam-Column Assemblages Strengthened with FRP and Anchored with Spike Anchors by Elias Saqan, American University in Dubai; Hayder Rasheed, Kansas State University; and Tarek Alkhrdaji, Structural Technologies
Seismic Performance of Repaired Lightly Reinforced Concrete Walls by Christopher Motter, Washington State University
Repaired Reinforced Concrete Wall Buildings in Chile after 2010 Earthquake by Matias Hube, Pontifical Catholic University of Chile
Residual Capacity of Damaged and Epoxy-Repaired Reinforced Concrete Plastic Hinges by Kai Marder, University of Auckland; Kenneth Elwood, University of Auckland; Christopher Motter, Washington State University
Specifications for Repair of Concrete in Buildings
In developing 563, topics emerged for which the industry does not have consensus, or for scope that is currently under study and is not ready for standardization. A round table discussion of repair trends and new work needed in the future will be convened by the incoming chair of 563, with input from the session speakers.
What the Future Might Hold for 563 by John Lund, Martin / Martin Inc.
Sustainable and Low-Cementitious-Materials-Content Self-Consolidating Concrete
The use of self-consolidating concrete (SCC) can contribute to increased productivity, an improved working environment, and improved concrete mechanical behavior and durability. However, use of SCC is still generally low, mainly due to the high cost associated with the high cement content and admixtures. The effective reduction of cement and cementitious materials contents in SCC mixtures will reduce cost and also minimize environmental impact. Among other benefits of reduced cement content leading to reduced paste content is reduced concrete shrinkage and thereby reduced risk for crack formation. This section includes presentations on the benefits, design, and performance of SCC with low cementitious materials content.
Particle Packing and Mixture Design Approach for Eco-SCC by Kamal Khayat, Missouri S&T; Olafur Wallevik, Innovation Center Iceland; and Behrouz Esmaeilkhanian, Beton Provincial Ltee
Sustainable Self-Consolidating Concrete: Utilization of Limestone Powders by Natalia Cardelino, Mercer University; Kimberly Kurtis, Georgia Institute of Technology; and Russell Gentry, Georgia Institute of Technology
The Rheology of Control Flow Concrete by G. Terry Harris, GCP Applied Technologies; Klaus Alexander Rieder, GCP Applied Technologies; Elizabeth Burns, GCP Applied Technologies; Joshua Curto, GCP Applied Technologies; and N. Tregger, GCP Applied Technologies
Eco-Efficient Self-Consolidating Concrete (Eco-SCC) with Low Powder Content and Recycled Concrete Aggregate by Jiong Hu, University of Nebraska–Lincoln
The Role of Materials in Sustainable Concrete Construction
ACI 130's Sustainability of Concrete Materials book will have been approved and published by the time of the Las Vegas convention. Therefore, this session will introduce the ACI community to this new publication.
Achieving Sustainability and Resiliency in the Built Environment Through the Use of Blended Cements by Julie Buffenbarger, Beton Consulting Engineers
Natural Pozzolans as Sustainable Supplementary Cementitious Materials by Raissa Ferron, University of Texas at Austin
Reducing Clinker Content and Carbon Footprint of Concrete Using SCMs, Limestone Cement, and Optimized Aggregate Gradations by R. Doug Hooton, University of Toronto
Achieving Sustainability by Use of Alternative Cements by Mary Christiansen, University of Minnesota Duluth
2017 ACI Spring Convention, Detroit, MI
Beneficiation of Fly Ash for Use in Concrete Mixtures
Fly ash has become a strategic material for solving concrete durability challenges and making concrete construction more resilient and sustainable. Fly ash quality can be improved through various processing techniques. To meet market demand for quality and quantity, beneficiation is an increasing necessity. In addition, reclaiming fly ash from disposal in landfills and ponds is becoming more common and often requires beneficiation. This session will present the most widely used technologies in the market today. This session will be of great value to specifiers, engineering consultants, contractors, and material suppliers.
Georgetown, SC: A Reclaiming Success Story by Hank Keiper, The SEFA Group
What Problem Am I Fixing? by Craig Plunk, Boral Construction Materials
Bond in Concrete
This series of sessions, co-organized by fib, serves as an interim to the Bond in Concrete conference series, held in Europe every 10 years. Various presentations will highlight the following information: 1) important changes required to development and lap splice provisions for reinforcement; 2) new works and developments as related to the modelling of bond between reinforcing steel and concrete; and 3) the results of recent experimental studies relating to lap splicing of straight bars.
Assessing Historical Provisions for the Bond of Plain Bars by Lisa R. Feldman, University of Saskatchewan; and John Cairns, Heriot-Watt University
Development Length of Straight Bars in Tension Using High-Strength Materials by Samir Yasso, University of Kansas; and Remy D. Lequesne, Andres Lepage, David Darwin, and Matthew O'Reilly, University of Kansas
Proposed Code Provisions for Anchoring Reinforcing Bars with Standard Hooks and Heads by David Darwin, University of Kansas; and Matthew O'Reilly, Giuseppe Centonze, Krishna P. Ghimire, and Yun Shao, University of Kansas
Case Studies of Performance-Based Specifications
Various experts will share their experience in implementing performance-based specifications in projects. Projects will cover a broad range of applications. The focus will be on lessons learned and how someone can implement a successful performance-based specification.
Performance Specification Compliance for Design-Build and P3 Projects by Neal S. Berke, Tourney Consulting Group
Development and Execution of a Performance Specification for Mass Concrete in a Transit Station by R. Doug Hooton, University of Toronto; and John A. Bickley, John A. Bickley Associates
VDOT's Experience with Performance Specifications by Michael Sprinkel, Virginia Transportation Research Council
Implementation of Performance Specifications for Concrete at the Illinois Tollway by Daniel J. Gancarz, Applied Research Associates
Case Study Using Performance-Based Criteria for SCC Coastal Condominium Column Repair by David G. Tepke, SKA Consulting Engineers Incorporated
The Christopher S. Bond Bridge—An Icon for Kansas City by Karthik Obla, National Ready Mixed Concrete Association
The Port Authority of New York & New Jersey's Experiences with Performance Specifications by Casimir J. Bognacki, The Port Authority of New York & New Jersey
Performance-Based Specifications – State of the Industry by Colin Lobo, NRMCA
Durability of Concrete Members Incorporated with Conventional and Advanced Materials
The presentations in this session will emphasize the durability of concrete bridges and buildings subjected to aggressive environmental or physical distress. Presentations will encompass a variety of technical aspects, such as the residual behavior of concrete members, performance of concrete structures reinforced or strengthened with fiber-reinforced polymer composites, and damage detection and assessment techniques. Both experimental and analytical investigations are of interest. The session brings to light recent research findings and provides an opportunity to discuss present challenges and technical demands. Critical information is given to those who lead tomorrow's structural design and construction, including practicing engineers, government officials, and academics.
Australian Developments in Concrete Durability Consultancy by David Millar, Building and Construction Research and Consulting
Behavior of Prestressed Concrete Beams with CFRP Strands by Franz N. Rad, Portland State University; and Yasir M. Saeed, Portland State University
ASR Damage Detection and Assessment of Supplementary Cementitious Materials Subjected to Environmental Loadings by Shuaicheng Guo, Michigan Technological University; and Qingli Dai, Michigan Technological University
Microscopic Cracking of ASR-Affected Fiber-Reinforced Concrete by Bishnu P. Gautam, University of Toronto; and Daman K. Panesar, University of Toronto
Durability of SEACON: Concrete Made with Sea Water and Salt-Contaminated Aggregate by Morteza Khatib, University of Miami; F. De Caso and Antonio Nanni, University of Miami
Long-Term Durability of GFRP Internal Reinforcement in Concrete Structures by Omid Gooranorimi, University of Miami; John J. Myers, Missouri S&T; Doug D. Gremel, Hughes Brothers; and Antonio Nanni, University of Miami
Behavior of Concrete Beams with Corroded Reinforcement Retrofitted with CFRP by Franz N. Rad, Portland State University; and Needa Lingga, Portland State University
Fire Resistance and Resiliency-Threats to Use of Concrete and Masonry Construction
Non-combustibility, fire resistance, and resiliency have always been inherent properties of concrete and masonry construction. Because of these properties, concrete and masonry construction were preferred building materials in many applications, including multi-family housing and high-rise construction. Recent trends, both in the United States and internationally, have put these applications at risk to various types of light frame and mass timber construction. Throughout the world, there has been a push for larger and higher light frame construction, and with that, significant risks related to the vulnerability of these structures to fires. It is expected the upcoming code development cycle for the International Building Code (IBC) will see continued efforts to provide more applications for light frame and mass timber construction, into applications where concrete and masonry construction have been used. With this IBC development cycle starting in early 2018, this session is important and timely to review current code provisions, anticipate threats, review the situation internationally, and provide avenues for the concrete and masonry industry to combat these threats.
Strategies for Enhancing Fire Resistance and Resiliency of Modern of Concrete Structures by Venkatesh Kumar R. Kodur, Michigan State University
Resilience of Structure Related to Fire by Stephen S. Szoke, American Concrete Institute
Historical Evolution of Buildings and Fire Resistance in U.S. Codes by Stephen V. Skalko, P.E. & Associates
High-Strength (HS) Steel Reinforcement-Emerging Trends
Learn about emerging trends in the metallurgy of high-strength (HS) steel reinforcement, design considerations, current research focusing on ductile and non-ductile behavior of concrete structures reinforced with HS, and proposed ACI Subcommittee.
Metallurgy of High Strength—Emerging Trends by Jacob Selzer, Commercial Metals Corporation
State of Practice and Design Considerations by David Fields, Magnusson Kemencic Associates
Proposed ACI 318 Code Provisions for High Strength by Dominic Kelly, Simpson Gumpertz & Heger
Advances in High-Strength Reinforcing Bars in the U.S. by Wassim Ghannoum, University of Texas at San Antonio
Shotcrete: New 506 Guide and Recent Developments
The main objective of the session is to publicize and present the recently published new ACI 506 "Guide to Shotcrete" (published in July 2016) and demonstrate how it is now in sync with our specification document (ACI 502.6-13). The attendees' outcome is a better knowledge of the recent (and most importantly shotcrete-related) ACI documents (Guide + Spec) and how to navigate them, as well as state-of-the-art news on technical shotcrete developments. Following this main theme for the session, the attendees will also learn of the detailed differences between shotcrete and concrete (both technically and contractually) and receive clear directive on selecting the dry or the wet process for a given job. Moreover, two selected technical presentations will bring forward the most recent development and research on the effect of bond quality on reinforcement development length and on the control of rheology to further improve inplace strength and durability.
The Fundamental Approach of Shotcrete Application for an Adequate Structural Use by Pasquale Basso Trujillo, Laval University; Bruno Massicotte, Ecole Polytechnique Montreal; and Marc Jolin and Benoit Bissonnette, Laval University
The Role of Time and Temperature in Hot Weather Concreting
Contractors, Specifiers, Concrete Producers and Concrete Testing Agencies will be able to better understand the impact of time, temperature and drum revolutions on the performance of ready-mix concrete during production and placement of concrete during hot weather.
Hot Weather Concreting in Florida—The 14/Selmon Expressway Connector by G. Terry Harris Sr, GCP Applied Technologies; Raymond O. Fox, GCP Applied Technologies; and David Westcott, Cemex, Inc.
Hot Weather Concreting in South Louisiana: Project Profile by TJ Harris, Ascension Ready Mix
UHPC—Innovations for Broad Application
Ultra-high-performance concrete (UHPC) is seen as an influential material innovation in the construction industry in the twenty first century. Many research groups overseas as well as in the United States have studied the material and structural behavior in the last two decades. One of the most critical challenges is finding innovative approaches in material design, quality control, and structural performance to strengthen the broad application of this material. UHPC is a preferable construction material of the twenty-first century due to its excellent strength, durability, ductility, and energy dissipation capacity. The session will invite national and international research groups, material suppliers, and contractors to share their knowledge in innovations for broad application. This session fits naturally into the theme "Driving Concrete Technology."
Exterior Ultra-High-Performance Concrete Thin Wall Cladding Panels & Building Code Compliance by Mahmut Ekenel, ICC Evaluation Service
Study on the Field Thermal Curing of Ultra-High-Performance Concrete Employing Heat of Hydration by Amirpasha Peyvandi, Stantec Inc.
Seismic Design and Performance of UHPC Bridge Bents by Mohamed Moustafa, University of Nevada, Reno; and Christopher Joe, University of Nevada, Reno
UHPC Application in Cladding Panels by Luke R. Pinkerton, Polytorx
Latex-Modified UHPC for Innovative Strengthening Technique of RC Beams by Moneeb Genedy, University of New Mexico; and Mahmoud M. Reda Taha, University of New Mexico
The Challenges and Solutions of Utilizing a Fluid UHPFRC for Large Pours by William T. Kulish, Kulish Design Company & The Steelike Concrete System
2017 ACI Fall Convention, Anaheim, CA
Concrete and Digital Fabrication: Perspectives, Challenges and Developments
This session, co-organized with RILEM (Technical Committee DFC: Digital fabrication with cement-based materials and RILEM 266-MRP – Measuring Rheological Properties of Cement-Based Materials) seeks to present the latest developments on the topic of 3-D printing of concrete. This new frontier in building materials technology investigates methods and materials that will allow concrete to be made rapidly, at a lower cost, in unique designs and without formwork. This revolutionary idea exists at an intersection between concrete materials science and advanced processing technologies.
Digital Concrete at ETH Zurich by Timothy Wangler, ETH Zurich; and Ena Lloret, Norman Hack, and Lex Reiter, ETH Zurich
3-D Printing Concrete—Workability and Rheology by Mohammed Sonebi, Queen's University Belfast; Sofiane Amziane, Blaise Pascal University; Damien Rangeard, National Institute of Applied Sciences; and Arnaud Perrot, Universite de Bretagne-Sud
Performance-based Laboratory Testing of Cementitious Materials for Construction-Scale 3-D Printing by Ali Kazemian, University of Southern California; and Xiao Yuan, Department of Industrial and Systems Engineering
FRP Symposium
This international symposium attracts interest from researchers, practitioners, and manufacturers involved in the use of fiber-reinforced polymers (FRPs) as reinforcement for concrete structures. This includes the use of FRP reinforcement in new construction and FRP for strengthening and rehabilitation of existing structures.
Characteristics of FRP Pretensioned Concrete Beams after Long-Term Exposure by Hirofumi Watanabe, Kawada Construction Company, Ltd.; Hiroshi Nakai, Maeda Kohsen Co., Ltd; and Tsuyoshi Enomoto, Tokyo Rope Company, Ltd.; and Taketo Uomoto, Public Works Research Institute
2-D Debonding Evolution in FRP Strengthened Plates Under Combined Loading by Shai Feldfogel, Technion-Israel Institute of Technology; and Oded Rabinovitch, Technion-Israel Institute of Technology
Evaluation of Prestress Stress Relaxation Losses and Harping Strength Reduction of Prestressing CFRP Cables and Bars by Abdeldjelil Belarbi, University of Houston: Hamidreza Tahsiri and Mina M. R. Dawood, University of Houston; and Bora Gencturk, University of Southern California
FRP Bond Strength to Concrete Using Bio-Sourced Resin Wet Layup by Amir Fam; Queen's University
FRP Shear Friction Reinforcement for Concrete Joints by Amr Abdel Fattah El Ragaby,University of Windsor; and Faouzi Ghrib, Jehad Alkatan, and Mofrhe Alruwaili, University of Windsor
Impact Tests of RC Beams Flexurally Strengthened with CFRP Material by Norimitsu Kishi, National Institute of Technology, Japan; Masato Komuro and Yusuke Kurihashi, Muroran Institute of Technology, Japan; and Hiroshi Mikami, TRI of Sumitomo-Mitsui Construction Co., Ltd
Interface between Carbon Fiber-Reinforced Polymer Sheets and Concrete Exposed to Freeze-Thaw Cycles by Wanting Wang, University of Colorado, Denver; and Yail Jimmy Kim, University of Colorado, Denver
Research and Development of Concrete-Infilled FRP Pultruded Tubes by Thiru Aravinthan, University of Southern Queensland; and Weena Lokug and Ali Umran Alsaddi, University of Southern Queensland
Seismic Evaluation of RC Frame Members Strengthened with CFRP NSM Bars by Elias I. Saqan, American University in Dubai; Hayder A. Rasheed, Kansas State University; and Tarek Alkhrdaji, Structural Technologies
Steel-Free Multi-Girder Hybrid Deck System—Design Considerations and Construction Challenges by Raafat El-Hacha, University of Calgary
Very Stiff Pultruded FRP Elements for Non-Continuous Reinforcement of Concrete by Ardavan Yazdanbakhsh, City College of New York; and Lawrence C. Bank, City College of New York
Hot Topic Session: Damaging Effects of Hurricanes Irma and Maria, and Recent Mexican Earthquakes
This session will describe preliminary reconnaissance of damage due to recent earthquakes and hurricanes. It will also discuss ways to improve resiliency of man-made structures to minimize devastating effects of natural hazards and to provide guidance for community planning.
Seismic Data During September 7 and 19 Earthquakes Measured in a Building Located in Mexico City by Roberto Stark, Stark + Ortiz, S.C.
Hurricane Maria by Jose (Pepe) M. Izquierdo Encarcion, Principal of PORTICUS CSP Consulting Firm, Rio Piedras, Puerto Rico
The September 7 and 19, 2017 Earthquakes in Mexico: A First Look at their Impact by Sergio M. Alcocer, Professor Institute of Engineering, UNAM, Mexico
How to Design and Construct Concrete and Masonry to Comply with New Energy Codes
This session will address and clarify the requirements of the new energy conserving building codes and explain a clear path to compliance using the ACI 122R-14 guide as a reference. Descriptions of methods of optimizing energy performance integrating structural design and design for energy efficiency. This course will explain why energy code compliance and optimization of energy performance are key aspects of sustainable concrete and masonry building construction.
Optimizing Energy Code Compliance for Concrete and Masonry by William McGinley, University of Louisville
Influence of Early-Age properties on Crack Development and Long-term Durability – Bridge Decks
The causes for concrete pavement cracking and how they are related to the development of early-age properties and their effect on long-term durability will be explored during this session. This includes:
The effect of mixture design (including materials used and proportion of materials) on early-age properties and bridge deck and/or concrete pavement cracking
The influence of construction practices on early-age properties and bridge deck and/or concrete pavement cracking
The impact of specifications on early-age properties and bridge deck and/or concrete pavement cracking
The relation between bridge deck and/or concrete pavement cracking caused by early-age properties development and the reduction of long-term durability
Early-age measurement techniques that can evaluate early-age properties that are most related to bridge deck and/or concrete pavement cracking
Quality assurance practices to prevent cracking
Low-Shrinkage Fiber-Reinforced Concrete for Improved Crack Control and Durability by Amir Bonakdar, The Euclid Chemical Company
Evaluating Crack-Reduction Technologies for Settlement Cracking in Concrete Bridge Decks by James D. Lafikes, University of Kansas; and Rouzbeh Khajehdehi, Muzai Feng, Eman Khalid Ibrahim, Matthew O'Reilly, and Dave Darwin, University of Kansas
Modification to ASTM C157 to Measure Early-Age Deformation of Concrete Specimens by Muzai Feng, University of Kansas; and Eman Khalid Ibrahim, Rouzbeh Khajehdehi, James D. Lafikes, Matthew O'Reilly, and David Darwin, University of Kansas
Field Evaluation of Early-Age Cracking in Concrete Bridge Decks and its Impact on Long-Term Durability by Aleksandra Radlinska, Pennsylvania State University; and Farshad Rajabipour, Pennsylvania State University
Early-Age Bridge Deck Cracking—A Case Study by Elizabeth Nadelman, Wiss, Janney, Elstner Associates, Inc.
Making Connections – The Future of Our Infrastructure
This session will highlight a diverse range of infrastructure project types on the U.S. West Coast and the innovative uses of precast concrete, cast-in-place concrete, and grout to solve complex engineering issues. Various applications of concrete pavements will also be discussed from both the client and designer perspective to understand the current serviceability challenges and advancements geared toward producing longer-lasting concrete pavements.
The Future of Our Infrastructure, A Caltrans Perspective by Thomas Pyle, Caltrans
SR99 Bored Tunnel by Chad Mathes, Dragados USA; and Francisco Gonzalez-Fernandez, Dragados USA
Gerald Desmond Replacement Bridge Project by Tanya Wyckoff, Caltrans; and Zephaniah Varley, WSP/Parsons Brinckerhoff
Cementitious and Non-Cementitious Grouting Techniques for Underground Construction by Luis Piek, Walsh-Shea Corridor Constructors
Performance-Based Design
This session aims to provide the current knowledge in performance-based design of bridges. Bridges are a critical component of our infrastructure system and failure of bridges is a safety issue. More progress has been made in performance-based design in seismic analysis of buildings than that of bridges. AASHTO seismic requirements are based on the level of ductility of structural members, importance of the structure, level of deformation, and soil conditions. On the other hand, performance-based design is based on having bridge performance achieve defined performance criteria such as strength, ductility, or deformation. The session contains presentations of experimental and/or analytical research focusing on the performance-based design of bridges and bridge components.
Seismic Performance Assessment of Concrete Bridge Piers Designed Following Canadian Highway Bridge Design Code by Rashedul Kabir, Qi Zhang and M. Shafria Alam, The University of British Columbia
Seismic Design of Shape Memory Alloy Reinforced Concrete Bridge Pier by AHM Muntasir Billah, University of British Columbia; and Shahria Alam, University of British Columbia
A Probabilistic Study to Identify the Effect of Different Damping Modeling Characteristic on the Seismic Response of R/C Bridges by Mohamed Moustafa, University of Nevada, Reno
Performance of Horizontally Curved Highway Bridge with Seismic Isolation by Ahmed M. Abdel-Mohti, Ohio Northern University; Eric V. Monzon, California State University, Sacramento; Ian G. Buckle, University of Nevada, Reno; Ahmad M. Itani, University of Nevada, Reno
Performance Limit States of Reinforced Concrete Filled Steel Tube Drilled Shafts by Diego A. Aguirre-Realpe, North Carolina State University
Performance-Based Seismic Design of RC Buildings: State of Practice
This session presents the state of practice for the performance-based seismic design (PBSD) of reinforced concrete buildings. The use of PBSD for new construction is expanding, as evidenced by the design guidelines that are available and the stock of completed building projects. These presentations bring together the implementation of PBSD through state-of-the art project examples, the current design guidelines employed, and research that supports PBSD.
Performance-Based Seismic Design of the New Tocumen International Airport South Terminal in Panama City, Panama by Andrea Soligon, Partner Foster + Partners
Revitalizing a Community Space Using Performance-Based Seismic Design by Saeed Fathali, Structural Technologies; and Bret Lizundia and Francisco Parisi, Rutherford + Chekene
First Performance-Based Seismic Design Tower in Oakland, CA by Devin K. Daniel, Magnusson Klemencic Associates Inc.; and Ian S. McFarlane, Magnusson Klemencic Associates Inc
Proportioning Strength to Limit Building Movements of Slender Core-Only Towers by David Shook, Skidmore, Owings & Merrill LLP; and Mark P. Sarkisian and Eric Long, Skidmore, Owings & Merrill, LLP
Performance-Based Seismic Design by Joe Ferzli, Cary Kopczynski & Company; and Mark Whiteley and Cary S. Kopczynski, Cary Kopczynski & Company
Design and Modeling Issues Related to Diaphragms of Tall Buildings by Gian Carlo Piatos, Univeristy of California, Los Angeles; John W. Wallace, University of California, Los Angeles; and Kristijan Kolozvari, California State University, Fullerton
Analysis and Design of Reinforced Cast-in-Place Concrete Diaphragms by Drew Kirkpatrick, Thornton Tomasetti, Inc.; and Leonard M. Joseph, J. Ola Johansson, and Karem Gulec, Thornton Tomasetti, Inc.
Performance Based Seismic Design vs. Code Level Design by Tom C. Xia, DCI Engineers
Trends in Demands for Concrete Performance-Based Seismic Design Towers by Kevin Aswegan, Magnusson Klemencic Associates Inc.; and Ian S. McFarlane, Magnusson Klemencic Associates Inc
Assessment of a 12-Story Code-Compliant Reinforced Concrete Special Moment Frame Using Performance-Based Seismic Engineering Standards and Guidelines: ASCE 41, TBI, and LATBSDC by Mustafa K Buniya, Oregon State University; Andre R. Barbosa, Oregon State University; and Siamak Sattar, National Institute of Standards Technology
SoCal Modernism – Preserving Concrete Modernist Structures
These presentations will highlight the modernist structures in Southern California as well as throughout the country, including the unique technical challenges associated with preservation, repair, and restoration of these structures. Attendees with an interest and expertise in historic structures will leave with a better understanding of the architectural and construction history of these structures, their inherent challenges, and an overview of successful repair approaches.
Dodger Stadium, Keeping an Icon Relevant by Janet Marie Smith, Los Angeles Dodgers; and Ryan Wilkerson, Nabin Yousset Associates Structural Engineers
Troubleshooting Concrete Pavements
Concrete pavements are an important pavement type for a range of applications—from lightly loaded streets to heavily loaded roadways and airfield facilities. It is becoming an established practice in the United States to require that concrete pavements provide low maintenance service lives of 40 or more years irrespective of the application. Long-life concrete pavements have been attainable for a long time (as evidenced by the fact that a number of very old pavements remain in service); and recent advances in design, construction, and concrete materials technology give us the knowledge and technology needed to consistently achieve what we already know to be attainable. To achieve long life, pavements must not exhibit premature failures and must have a reduced potential for cracking, faulting, spalling, and materials related distress. However, even though it is not a widespread occurrence, concrete pavements do once in a while exhibit premature or early-age failures, reducing the service life of the facility at a cost to the owners and facility users as well as creating a potential for litigation between the different parties involved in the affected projects. The proposed two-part technical sessions will include presentations by nationally recognized concrete materials, pavement design, and pavement construction experts on concrete pavement premature failures case studies and best practices to minimize or eliminate premature failures in concrete pavements. The session is targeted at concrete pavement, materials, and construction engineering professionals who are involved in various aspects of concrete pavement design, construction, testing and evaluation, and rehabilitation. These professionals include state and municipal engineers, consulting engineers, contractors, concrete materials suppliers, and academia.
Troubleshooting and Improving Pavement Performance in Michigan by Daniel M. DeGraaf, Michigan Concrete Association
Ward R. Malisch Concrete Construction Symposium
This session brings together important and influential information with respect to concrete construction in honoring Ward R. Malisch, Honorary Member of ACI. Contractors and engineers interested in the application of ACI documents to construction projects and in evaluating construction information with respect to constructability. Part 1 includes furthering knowledge of interesting common construction activities including: estimating effects of humidity, temperature an wind on curing slabs by estimating evaporation rates using 'sophisticated' the Menzel/NRMCA Nomograph approach; learning methods to accept concrete delivery times of 90 minutes or more in certain applications; understanding best location of vapor retarders below slabs-on-ground to minimize moisture penetration negatively affecting moisture sensitive floor coverings; real effect of placing water that is 20 F colder than concrete curing water on freshly placed slabs-on-ground; identify successful applications for using self-consolidating concrete in high strength concrete applications and use of hydration stabilizing admixtures to deliver and pump concrete in congested urban high rise building projects that far exceeds normal projects.
Leveraging 3-D Laser Scanning for Concrete Analysis by Philip G. Lozenzo, Rithm
2016 ACI Spring Convention, Milwaukee, WI
ACI 562 Concrete Repair Code, Applicability, and Use (ACI Spring 2016 Convention, Milwaukee, WI)
The objective of the session is to educate government code officials, licensed design professionals, owners, and contractors on the applicability and use of ACI 562-13, "Code Requirements for Evaluation, Repair, and Rehabilitation of Concrete Buildings and Commentary," and the new ACI/ICRI "Guide to the Code for Evaluation, Repair, and Rehabilitation of Concrete Buildings" through practical examples.
Design Strength Requirements for Externally Applied Reinforcing Systems by Tarek Alkhrdaji, Structural Technologies
Advances in Test Methods to Evaluate Alkali-Aggregate Reactivity in Job Concrete Mixtures (ACI Spring 2016 Convention, Milwaukee, WI)
The principal objectives of the existing standard test methods for evaluating alkali-aggregate reactivity (AAR) in mortars and concrete is to identify the susceptibility of aggregates to undergoing alkali-silica reaction (ASR), to identify the effectiveness of supplementary cementitious materials (SCMs) in mitigating ASR, and quantify the suitable dosage level of SCMs in the concrete mixtures. However, these short-duration tests (the concrete prism test, mortar bar method test, accelerated mortar bar test, new concrete cylinder test, and new autoclave concrete prism test) have limitations in their ability to provide a direct measure of how a job's concrete mixture might perform in the field over the long term. These sessions will shed light on developments in the areas of new test methods that are focused on assessing the alkali-silica reactivity potential of a job's concrete mixture and new nondestructive test methods to evaluate the extent of damage in job concrete mixtures. Engineers, contractors, researchers, and students will benefit from learning about the latest research and test methods that will pave the way for a performance-based approach in specifying durability in concrete mixtures.
Considerations in Application of Miniature Concrete Prism Test (MCPT) to Evaluate Alkali-Silica Reactivity Potential of Job Concrete Mixtures by Prasad R. Rangaraju, Clemson University
Concrete Bridges Built with Advanced Materials: Seismic Performance and Design Issues (ACI Spring 2016 Convention, Milwaukee, WI)
ACI Committee 341, "Earthquake-Resistant Concrete Bridges," hosted a session on the seismic performance evaluation, design, and retrofitting of concrete bridges by using advanced materials such as shape memory alloy (SMA) in the form of reinforcing bar, wire, or strand; ultra-high-strength metals; ultra-high-performance cement composites; and nanosilica. The main objective of this session is to present results from recent research studies (experimental/numerical/analytical) and practical examples of application of advanced materials in reinforced concrete (RC) bridge piers, bents, or full bridges. This session is for practitioners, educators, and researchers.
Durability and Seismic Performance of Bridge Columns with Ductile Fiber-Reinforced Cementitious Materials and Superelastic Alloys by Bora Gencturk, University of Houston
A Bridge Bent Suitable for Accelerated Bridge Construction (ABC) in High Seismic Regions by John F. Stanton, University of Washington
Performance-Based Damage States of Shape Memory Alloy (SMA) Reinforced Concrete Bridge Piers by Shahria Alam, University of British Columbia
Innovative Techniques for Seismic-Resistant Bridge Columns under Ground Motion Excitations by Mohamed A. El-Gawady, Missouri S&T
Concrete Consolidation in the 21st Century (ACI Spring 2016 Convention, Milwaukee, WI)
The purpose of the session is to show the audience how consolidation needs to be reconsidered for modern twenty-first-century concrete mixtures. The anticipated presentations will show the influence of concrete proportioning and workability on the consolidation energy necessary. The contributions will mainly focus on flowable concrete that is not yet consolidating. The main audience for the session is contractors, but concrete producers, materials suppliers, designers, architects, and scientists will also have interest in this session.
The Milwaukee Art Museum and Discovery World: Two Hundred Yards and Four Years Apart, Illustrating the Evolution of Concrete from the 20th to the 21st Century by John F. Gibbons, Concrete Materials Consultant
Concrete Pavement Construction (ACI Spring 2016 Convention, Milwaukee, WI)
Effective construction practices are essential to the long-term performance of the concrete pavement structure. This session reviews successful construction practices for a range of concrete pavements.
Bonded Concrete Overlay of Asphalt—Urban Pavement Rehabilitation Solutions by Tim Cost, LafargeHolcim
Construction of an Unbonded Concrete Overlay under Traffic by Peter C. Taylor, CP Tech Center
Evolution of RCC Construction in Texas by Jan R. Prusinski, Cement Council of Texas
Design of Concrete Elements Using High-Strength Reinforcement (ACI Spring 2016 Convention, Milwaukee, WI)
"Concrete elements have used reinforcement to improve concrete behavior. Advances in steel reinforcement have changed the traditional design and application of reinforced concrete elements. This session will discuss deflections of concrete beams reinforced with high-strength steel, design efficiencies using high-strength steel, using high-strength welded wire reinforcement in concrete structural applications, and design methodology for using ATM A1035 Grade 100 steel in reinforced concrete structural applications.
High-Strength WWR in Concrete Structural Applications by David H. DeValve, Oklahoma Steel & Wire
Ground Limestone and Mineral Filler: Inert Fillers or Active Ingredients? (ACI Spring Convention, April 2016, Milwaukee, WI)
This session will explore whether ground limestone and mineral filler should be considered inert fillers or considered to contribute to hydration, strength, economy, and sustainability of concrete mixtures. This session will show how the use of ground limestone and mineral filler affects concrete properties and how mixture proportions can be optimized to take advantage of these materials.
Examining the Interactions of Limestone Powder with Portland Cement and Fly Ash in Binary and Ternary Blends by Scott Jones, National Institute of Standards & Technology
What Does Isothermal Calorimetry Tell Us about Limestone and Ground Lightweight Aggregates? by Jason Weiss, Oregon State University
White Concrete Using Ground Limestone by Bobby Bergman, Huber Carbonates LLC
Durability of Blended Binder Concretes Containing Limestone: Chloride Ion and Transport Experiments and Simulations by Narayanan Neithalath, Arizona State University
Hot Topic Session II: New One-Way Shear Equations for the 318 Building Code, Is it Time? (ACI Spring 2016 Convention, Milwaukee, WI)
The basic one-way shear equations in the ACI 318 Building Code have not changed since 1971, while other codes in the world have made changes. The current code consists of over 17 different equations. There have been advances in the understanding of size effect, members without transverse reinforcement, and members with the light longitudinal reinforcement. Members of Joint ACI-ASCE committees 445 and 446, and ACI Subcommittee 318-A devoted a great effort in the last two decades to investigate the effectiveness and safety of the current 318 one-way shear design equations. Immediately after the 318-14 Code cycle, the above committees challenged the researcher and practitioner community to present proposals for new one-way shear design methods that are safer and more effective for possible incorporation into the 318-19 code cycle. To date, six proposals have been submitted. These proposals were first evaluated against the existing 445 experimental shear database and then implemented in a comprehensive design example database that includes slabs, beams, and columns with prestress and non-prestress. This session will present the result summary of these evaluations and give a chance to each proposal's author to describe the advantages of their method over the current 318-14 equations. The discussions held at this Hot Topic Session will be used by 318-E and 318 as input into their deliberations on the next step for one-way shear design for the 318-19 Building Code. This will be followed with a period of Q/A and attendees' input and feedback on the new approaches.
Presentations include:
New Look at One-Way Shear Design Approach – ACI 318-E Initiative by David H. Sanders, University of Nevada
Summary of ACI-ASCE 445 Activities on One-Way Shear Design Methods by Abdeldjelil Belarbi, University of Houston
Use of Design Database to Compare Design Approaches by Daniel A. Kuchma, Tufts University
One-Way Shear Design Method Based on a Multi-Action Model by Antoni Cladera, University of Balearic Islands; and Antonio Marí and Jesús Bairan, Polytechnic University of Catalonia
One-Way Shear Design Method – A Unified Approach by Robert J. Frosch, Purdue University; Qian Yu, University of Pittsburgh; Zdenek P. Bazant and Gianluca Cusatis, Northwestern University; Mija H. Hubler, University of Colorado, Boulder; and Jialing Le, University of Minnesota, Minneapolis
One-Way Shear Design Method – Simplifying the ACI Shear Provisions by Evan C. Bentz, University of Toronto; and Michael P. Collins, University of Toronto
One-Way Shear Design Method – Unified Theory by UH-NTU Version by Thomas T.C. Hsu, University of Houston; and Yi-An
Leveraging Mobile Technology in Design of Low-Rise Concrete Buildings (ACI Spring 2016 Convention, Milwaukee, WI)
"Guide to a Simplified Design for Reinforced Concrete Buildings," ACI 314R-16 presents simplified methods and design techniques that facilitate and speed the engineering of low-rise buildings within certain limitations. Material is presented in an order that follows typical design process with procedures introduced as the designer will need them in the course of a building design. An overview of ACI 314R-16 and the easiness of integrating modern calculation platforms for quick analysis and design will be presented.
Using Mobile Technology to Determine Concrete Properties Onsite by Aali R. Alizadeh, Pouria Ghods, Giatec Scientific Inc.
Leveraging Technology Advances to Stem the Gap in Workforce Shortages by David H. DeValve, Oklahoma Steel & Wire
Guide to Simplified Design for Reinforced Concrete Buildings—ACI 314R-11 by Jose M. Izquierdo-Encarnación, PORTICUS CSP
Precast Concrete Pavements (ACI Spring Convention, April 2016, Milwaukee, WI)
The production use of precast concrete pavement (PCP) has come a long way over the last 15 years. Since the first new-generation PCP projects were constructed during 2001, the technology has gained wider acceptance in the United States for rapid repair and rehabilitation of concrete pavements, as well as for heavily trafficked asphalt concrete pavements and intersections. Since 2001, many projects have been constructed and many advances have been made and continue to be made in the design, panel fabrication, and panel installation aspects of the technology. In the United States, the PCP technology is being used for intermittent repairs (full-depth or full-panel replacement) and for continuous applications (longer length/wider area rehabilitation) with service life expectations of at least 20 years for repairs and at least 40 years for continuous applications, without significant future corrective treatment.
This session, organized by ACI Committee 325, with support from the Federal Highway Administration (FHWA), will present the current developments and best practices related to PCP design, panel fabrication, and panel installation processes. In the first session, experts from several highway agencies, including Wisconsin DOT, will present the implementation details related to new PCP applications by their agencies.
Overview of Precast Concrete Pavement Practices and Recent Innovations by Shiraz D. Tayabji, Advanced Concrete Pavement Consultancy LLC
Implementation of Precast Concrete Pavement Technology in the United States—FHWA Initiatives by Samuel S. Tyson, Federal Highway Administration
Recent Innovations in Jointed Precast Concrete Pavement Systems by Peter J. Smith, The Fort Miller Company Incorporated
FHWA/SHRP2 Precast Concrete Pavement Implementation Assistance Program Projects by Shiraz D. Tayabji, Advanced Concrete Pavement Consultancy LLC
Precast Concrete Pavement Implementation in California by Mehdi Parvini, California Department of Transportation
Proportioning with Ground Limestone and Mineral Filler (ACI Spring Convention, April 2016, Milwaukee, WI)
This session will introduce the new document developed by ACI Subcommittee 211-N, "Guide to Proportioning Concrete Mixtures with Ground Limestone and Other Mineral Fillers," and provide case studies for ground limestone and mineral filler.
Performance of SCC Made with Limestone Fillers by Kamal H. Khayat, Director, Center for Infrastructure Engineering Studies, Missouri S&T
A Concrete Proportioning Method for Nonstandard Aggregates by Sarwar Siddiqui, Project Engineer, Smislova, Kehnemui & Associates
Optimization of the Use of Ground Limestone in Concrete by Caroline M. Talbot, Euclid Chemical
Hydration and Strength Development in Ternary Portland Cement Blends Containing Limestone and Fly Ash or Metakaolin
2016 ACI Fall Convention, Philadelphia, PA
Advanced Analysis of FRP-Strengthening Concrete Structures (ACI Fall 2016 Convention, Philadelphia, PA)
This session targets the application of advanced analytical techniques for the analysis and design of fiber-reinforced polymer (FRP) strengthened concrete structures, with an emphasis on structure and member behavior, as well as debonding and anchorage devices. It will be suitable to designers of FRP strengthening measures as well as researchers and manufacturers.
Modeling the Improvement in the Effective Intermediate Crack Debonding Strain in FRP Strengthened Beams Using Spike Anchors by Ahmed Al-Rahmani, Smislova, Kehnemui and Associates; and Hayder Rasheed, Kansas State University
The Use of U-Wrap Anchors to Improve the Effective Intermediate Crack Debonding Strain in FRP-Strengthened Beams by Hayder A. Rasheed, Kansas State University
Exploring the Potential of a New Type of CFRP Laminate and Technique for the Strengthening of RC Structures by Joaquim A. O. Barros, University of Minho; and Mohammadali Rezazadeh and Honey Ramezansefat, University of Minho
Permissible Moment Redistribution Limits for Continuous FRP-Strengthened RC Beams by Pedro Silva, George Washington University; R.K. Singh, George Washington University; and T.J. Ibell, University of Bath
Incremental Dynamic Analysis of CFRP-Strengthened RC Frames with Masonry Infills by Scott Thomas Smith, Southern Cross University; and Xiaolan Pan, Zhenyu Wang, and Daiyu Wang, Harbin Institute of Technology
Collapse Assessment of RC Structures by Riadh Al-Mahaidi, Swinburne University of Technology; and Javad Hashemi, Yassamin Al-Ogaidi, Robin Kalfat, and John Wilson, Swinburne University of Technology
A Guideline and Review on the Modeling Techniques Used in Finite Element Simulations of Concrete Structures Strengthened Using FRP by Robin Kalfat, Swinburne University of Technology; and Riadh Al-Mahaidi, Swinburne University of Technology
Construction Documents Using ACI 301 to Comply with ACI 318 Chapter 26 (ACI Fall 2016 Convention, Philadelphia, PA)
ACI Subcommittee 440-M, FRP-Repair of Masonry Structures, is sponsoring this technical session focusing on various applications of fiber-reinforced polymer (FRP) systems for masonry structures. Presentations relate to the FRP strengthening of existing masonry elements, and the use of FRP bars as internal reinforcement in new masonry construction. Current developments in design guides are presented, including international coverage of research and application. The goal of this session is to present the current state of the art in research and practice on the use of FRP systems to strengthen existing masonry structures, and to reinforce new masonry construction.
Overview of ACI 301 by Michelle L. Wilson, Portland Cement Association
Early-Age Concrete Properties Measurements for Concrete Pavement Construction Operations and Traffic Opening (ACI Fall 2016 Convention, Philadelphia, PA)
This session will promote best practices for obtaining the early-age concrete properties desirable for good concrete pavement performance based on reliable measurements instead of empirical evaluation, guessing estimates, or personnel experience.
Accuracy of Maturity-Based Predictions as Influenced by Method, Datum Temperature, and Activation Energy by Chang Hoon Lee, Cornell University
Contactless Ultrasonic System for Continuous Monitoring of Concrete Setting and Hardening by Hajin Choi, University of Illinois at Urbana-Champaign
Effect of Early Opening to Traffic on the Fracture Mechanics Parameters of IDOT Concrete Pavement and Patches by Mohsen A. Issa, University of Illinois
Maturity and Dynamic Modulus Tests for the Strength Prediction of IDOT Concrete Pavement and Patches at Early Opening to Traffic by Mohsen A. Issa, University of Illinois
Workability and Setting Time by Peter C. Taylor, CP Technology Center
Evaluation of Concrete Structures (ACI Fall 2016 Convention, Philadelphia, PA)
The structural evaluation process of existing concrete structures involves the understanding of existing capacity, safety, and future expected life. Although there are some codes and guidelines to help engineers to obtain this information, the acceptable criterion is the target reliability index, which is rarely used or defined in current codes. The objective of the proposed session is to present the challenges and solutions using more rational reliability approaches in evaluating concrete structures. Papers on evaluation methods, prediction models, reliability analysis, and code calibration will be presented.
Risk Acceptance Criteria in Safety Evaluation and Design of Existing Concrete Structures by Ming Liu, Naval Facilities Engineering Command
Fiber-Reinforced Polymer (FRP) Systems for the Strengthening of Existing Masonry Structures and for Reinforcement of New Masonry Structures (ACI Fall 2016 Convention, Philadelphia, PA)
Behavior, Modeling, and Design of Infill Masonry Walls Strengthened with FRP Using Various End Anchorage by Dillon Lunn, Fluhrer Reed
Long-Term Performance of CFRP CMU Bond by Mostfa Al Azzawi, University of South Florida
Experimental Study on Flexural Behavior of Reinforced Masonry Walls Strengthened with FRCM Composite or NSM with Cementitious Adhesive by John J. Myers, Missouri S&T
CNR-DT 200 R1 Guidelines for Strengthening of Masonry Structures with FRP in Italy by Elio Sacco, University of Cassino and Southern Lazio
Hot Topic Session (ACI Fall 2016 Convention, Philadelphia, PA)
The use of alternative cementitious materials (ACMs) in construction is a developing technology. Currently, specifications and design codes are based on the use of portland cement as the primary binding ingredient. The use of ACMs is rapidly advancing, requiring owners, contractors, and engineers to address specifying, testing, and performance of ACMs. This session will offer perspectives on the challenges of ACMs and how specifications, building codes, and construction practices are adapting to new ACM technology.
Alternative Cementitious Materials (ACMs) State-of-the-Art Summary by Lawrence L. Sutter, Michigan Technological University
Alkali-Activated and Geopolymer Cements: Design from Atoms to Applications by John L. Provis, University of Sheffield
The Challenge of Assuring ACM Performance for Highway Concrete by Richard C. Meininger, Federal Highway Administration
Rational Design Methodologies: Fire Resistance of Concrete and Masonry (ACI Fall 2016 Convention, Philadelphia, PA)
This session will review the current methodologies for fire resistance design, including the ACI/TMS 216.1 requirements for determining fire resistance of concrete and masonry assemblies. Looking forward, rational design approaches will be discussed, as well as the current knowledge gaps that must be addressed before such methodologies could be standardized. A review of current research in fire performance of concrete and masonry will also be reviewed, especially as that research relates to promoting rational design methods.
Provisions of ACI/TMS 216.1—Concrete and Masonry Fire Resistance Calculation by R. Lang, National Concrete Masonry Association
Towards Rational Design Approaches for FRP Reinforced Concrete Structures in Fire by Mark F. Green, Queens University
Rational Design Methodology for Evaluating Fire Resistance of FRP-Strengthened Concrete Structures by Venkatesh Kumar R. Kodur, Michigan State University
Implementation of Performance-Based Fire Design Methodologies for Reinforced Concrete Structures by M. Monir Ajjan Alhadid, University of Western Ontario
Repair and Rehabilitation Tech Notes (ACI Fall 2016 Convention, Philadelphia, PA)
The Tech Notes produced by ACI Committee 364, Rehabilitation, cover important aspects of a concrete rehabilitation program, ranging from the initial stages of evaluation to strengthening and to conducting repairs so as to ensure a long service life.
Concrete Removal in Repairs Involving Corroded Reinforcing Steel (364.6T-02(11)) Use of Hydrodemolition for Removal in Unbonded Post Tensioned Systems (354.8T-02(11)) by Racheal D. Lute, University of Texas
Responsibility in Concrete Repair (ACI Fall 2016 Convention, Philadelphia, PA)
The responsibilities for parties involved in a repair project may be significantly different than those traditionally encountered in new concrete construction. The new ACI 562 Code Requirements for Assessment, Repair, and Rehabilitation of Concrete Buildings and anticipated ACI 563 Specification identify requirements for the Licensed Design Professional and the contractors' specialty engineer during repair programs. Differing lines of authority are presented through industry practice recommendations and case studies, along with identification of industry needs, informing parties engaged in concrete evaluation and repair projects.
Need to Initiate Responsibility Concept in the Largest Repair Industry—India Perspective by Surendra K. Manjrekar, SUNANDA Specialty Coatings Pvt LTD
Owner Participation in Innovative Engineering Solutions by Avanti C. Shroff, Invisible Innovations, Inc.
Are We Taking Concrete Repair Seriously—An Industry Point of View by Sarwar Siddiqui, Smislova, Kehnemui & Associates; and David J. Rodler, Smislova Kehnemui & Associates
Examining the Standards of Care for Evaluation of Existing Structures by Keith E. Kesner, CVM Engineers
Responsibility for Safety in Building Assessments—Personnel and Property by John S. Lund, Martin/Martin, Inc.
Case Studies on Repair—Expanding Responsibility Lines for the Engineer of Record by David A. VanOcker, CVM Engineers
Education Initiatives by ASCE Technical Council on Forensic Engineering—The Role of the Investigating Engineer by Norbert J. Delatte, Oklahoma State University
Is this the Concrete Mixture You Want? by Ashok M. Kakade, Concrete Science, Inc.
Responsibility for Mixed Performance/Prescriptive Concrete Mix Designs b Kevin A. MacDonald, Beton Consulting Engineers
Revolutionary Tilt-Up Design (ACI Fall 2016 Convention, Philadelphia, PA)
Recently, tilt-up concrete has been used in new building types, which has advanced the industry's technology and has provided unique solutions to building programs. This has been achieved through innovative engineering and construction. This session will disseminate information related to slender reinforced concrete, known as "tilt-up" or "site-cast tilt-up concrete.
Modeling Tilt-Up Panels by Jeff Griffin, LJB Inc
A Structural Engineer's Hacks to Tilt-Up Construction in Big-Box Warehouses by Doug Antholz, KPFF Consulting
Sulfate Attack on Concrete (ACI Fall 2016 Convention, Philadelphia, PA)
This course explores deterioration of concrete due to sulfate attack, a complex process characterized by multiple manifestations including volume expansion, cracking, spalling, softening of the cementitious matrix creating mushy concrete. Sulfate attack can be classified as internal or external to the cementitious matrix. The underlying damage of sulfate attack can be chemical or physical deterioration. The course scope involves theoretical and experimental aspects of different forms of sulfate attack as well as case studies. This course is an effort to compile current developments in research and standards, and educate practitioners and researchers about this concrete durability issue and its underlying mechanisms. And the effects of supplementary cementitious materials on mitigating external sulfate attack on concrete exposed to sulfates.
Performance Based Tests and Criteria for Concrete Durability by Colin L. Lobo, NRMCA; and Karthik H. Obla, NRMCA
2015 ACI Spring Convention, Kansas City, MO
Building Resiliency (ACI Spring Convention, April 2015, Kansas City, MO)
The Road to Resilience lies in adapting. Cities, towns, and communities, working with the construction industry, continue to rebuild and prevent against the challenges that face our buildings—both from natural disasters and aging structures. These presentations offer knowledge that stricter standards and design elements can go a long way to reaching our goal of being "resilient."
Resilience: What Role Will Concrete Play in Making Our Communities Safer? by Lionel A. Lemay, Senior Vice President, Sustainability, National Ready Mixed Concrete Association (NRMCA), Libertyville, IL Download the PDF
Enhancements in Building Design and Construction: Prerequisites for Resilient Communities by Stephen S. Szoke, Director Codes and Standards, Portland Cement Association, Skokie, IL Download the PDF
Building Resilience as a Design Objective by Mehrdad Sasani, Professor, Northeastern University, Boston, MA Download the PDF
Form Pressure of Self-Consolidating Concrete—Hydrostatic or Not? (ACI Spring Convention, April 2015, Kansas City, MO)
This technical session will highlight recent advances carried out to understand key factors affecting formwork pressure of SCC, including concrete thixotropy, casting rate, and formwork characteristics. The session will highlight various models that have been developed to estimate form pressure characteristics of SCC. A number of field-related projects targeting the calibration of various models are discussed. The session should be of interest to designers and construction professionals dealing with SCC technology, as well as researchers and educators interested in the science behind the control of form pressure.
Mixture Design and Materials Aspects Affecting Form by Kamal H. Khayat, Director, Center for Infrastructure Engineering Studies, Missouri S&T, Rolla, MO
Heavy-Duty Concrete Pavements (ACI Spring Convention, April 2015, Kansas City, MO)
Heavy-duty pavements span a wide variety of uses, from truck distribution facilities, to intermodal yards, to military equipment hardstands, to high-volume interstates. These pavements can be subjected to extremely high axle loadings, millions of heavy vehicle load repetitions, high-speed truck traffic, or all of these. Designers and contractors must understand the unique requirements of these pavements, and use appropriate design tools, specification provisions, and construction techniques to properly design and build the pavements for their expected service lives. Concrete pavements are ideally suited for these applications because of their rigidity, strength, and durability. However, different types of concrete pavements, including conventional jointed pavements, roller-compacted concrete (RCC), and precast, may be optimal choices depending on the circumstances.
Internally Cured Concrete Pavement for Intermodal Facility by Chetana Rao, Senior Research Engineer, Rao Research and Consulting, LLC, Champaign, IL Download the PDF
Fast-Track Precast Concrete Pavements for High-Volume Roadways by Shiraz D. Tayabji, Senior Principal Engineer, Applied Research Associates, Inc., Ellicott City, MD Download the PDF
Development of ACI 327R-14, "Guide to Roller-Compacted Concrete Pavements" by Norbert J. Delatte, Assistant Professor, Cleveland State University, Broadview Heights, OH Download the PDF
Value-Engineered Heavy-Duty RCC by Fares Y. Abdo, Director of Technical Services, Morgan Corp, Vestavia, AL Download the PDF
Development of ACI 330's Industrial Pavement Guide by Tim Cost, Senior Technical Service Engineer, Holcim (US) Inc., Canton, MS Download the PDF
Influence of Admixtures on Early-Age Properties (ACI Spring Convention, April 2015, Kansas City, MO)
The objective of this session will be to address the influence of chemical and mineral admixtures on the early-age properties of concrete, mortar, and grout. The session will educate practitioners on methods to measure early shrinkage, and to examine the effect of admixtures on early-age properties.
Early-Age Stiffening and Air Voids Stability Problems due to Incompatible Combinations of Cements, Fly Ashes, and Chemical Admixtures by Jan Olek, Associate Professor, Purdue University, West Lafayette, IN Download the PDF
Use of Chemical Admixtures to Enable Successful Manufacture of Concrete with Low Portland Cement Content by Ara A. Jeknavorian, Jeknavorian Consulting Services, Chelmsford, MA Download the PDF
Pumpability of SCC (ACI Spring Convention, April 2015, Kansas City, MO)
This session intends to inform concrete producers, contractors, academics, and students on the latest developments, common practices, and problems associated with pumping of self-consolidating concrete (SCC). The session focuses on selecting materials and optimizing mixture design to ensure adequate pumping of SCC. Practical experiences on the quality control of SCC for the construction of the Burj Khalifa, as well as the influence of SCC fresh properties on changes in the air void system due to pumping are discussed. The latest theoretical developments on prediction of pumping pressure, influence of constituent elements, and the changes in fresh concrete properties are also presented.
Burj Khalifa—A New High for High-Performance SCC by James M. Aldred, Principal Professional, AECOM, Sydney, NSW, Australia Download the PDF
Practical Experiences on Pumping of SCC by Matt Kaminsky, Postdoctoral Research Associate, ACI Concrete Placement, Spring Hill, KS
Influence of Pumping on Fresh Concrete Properties for SCC by Thomas A. Bier, Professor, TU Bergakademie Freiberg-Lehrstuhl Baust, Freiberg, Germany Download the PDF
Rational Approaches for Fire Resistant Design of Concrete Structures (ACI Spring Convention, April 2015, Kansas City, MO)
This session provides an opportunity for researchers, architectural/civil/structural engineers, and students to exchange recent advances in applied research and to share information, experiences, and knowledge in the implementation of rational design approaches for determining the fire resistance of a range of concrete structures.
Out-of-Plane Behavior and Failure of Full-Scale RC Bearing Walls during and after One-Sided Fire Exposure by Kevin Mueller, Structural Fire Engineer/Physical Security Consultant, Hinman Consulting Engineers, San Francisco, CA
Rational Design for FRP-Strengthened Reinforced Concrete Structures in Fire by Mark F. Green, Associate Professor, Queen's University, Kingston, ON, Canada Download the PDF
Effect of Rapid and Slow Heating Rate History on High-Strength Concrete Deformation and Failure Behavior by Elin A. Jensen, Assistant Professor, Lawrence Technological University, Southfield, MI Download the PDF
Tools for Performance-Based Design of Reinforced Concrete Structures by Maged A. Youssef, Professor, University of Western Ontario, London, ON, Canada Download the PDF
Recent Updates to Blast Design Guidance (ACI Spring Convention, April 2015, Kansas City, MO)
In this session, recent updates to blast design guidance will be presented. The session will focus on new criteria incorporated in "Structures to Resist the Effects of Accidental Explosions," UFC 3-340-02, Change 1 (2014). These criteria include a major revision to the UFC's analysis and design procedures for reinforced and unreinforced masonry walls and a new testing protocol and performance requirements for mechanical splices that will, for the first time, permit their use on certain explosives safety applications. In addition, recent research will be presented on the performance of concrete elements under blast loading.
Overview of UFC 3-340-02, Change 1 by William H. Zehrt, Jr., Safety (Structural) Engineer, DoD Explosives Safety Board, Alexandria, VA Download the PDF
Performance of Reinforcement Bar Mechanical Couplers at Low, Medium, and High Strain Rates by Stephen P. Rowell, Research General Engineer, Engineer Research and Development Center, U.S. Army Corps of Engineers, Vicksburg, MS Download the PDF
DoD Research in Support of Future UFC 3-340-02 by Robert T. Conway, Research Structural Engineer, NAVFAC Engineering and Expeditionary Warfare Center, Port Hueneme, CA
Resilient Housing (ACI Spring Convention, April 2015, Kansas City, MO)
This session will explore the topic of resilience as it pertains to the homes we live in and the communities they create. Attendees will come away with a greater understanding of economic and societal impacts of less durable housing, what it means to be resilient, and ways to create better buildings with concrete systems. New research into measuring the resilience of a home will link the use of concrete materials and systems to sustainable, longer-lasting structures. It will also detail the ways in which specific weather events such as high winds and storm surge can affect the built environment. Attendees will hear about protective measures for creating hazard-resistant housing using concrete building solutions. Case studies of real-world concrete homes subjected to severe weather will examine their design, construction, and performance to demonstrate that current technology exists to prevent this type of damage.
Enhanced Resilience: Why We Need It by Stephen S. Szoke, Director Codes and Standards, Portland Cement Association, Skokie, IL
Concrete Housing and Sustainability by Julie K. Buffenbarger, Construction Specialist, Lafarge, Cleveland, OH
High-Performance Concrete Housing by Brent Douglas Anderson, President, BDA Associates, LLC, Edina, MN
Tornadoes and Storm Shelters: Update on FEMA Design Guides by Lionel A. Lemay, Senior Vice President, Sustainability, National Ready Mixed Concrete Association (NRMCA), Libertyville, IL
Coastal Housing by J. Edward Sauter, Executive Director, Tilt-Up Concrete Association, Mount Vernon, IA
Case Study: Disaster-Resistant Guam Housing by Kenneth A. Luttrell, Vice President, CYS Structural Engineers Inc., Sacramento, CA
Ternary Blends and More (ACI Spring Convention, April 2015, Kansas City, MO)
This session looks at the use of multiple blends of cementitious materials used for designing durable and ultradurable concretes. The use of ternary and quaternary blends to achieve long-term lifetimes, and thus lower environmental impact, will be discussed.
Advantages of Silica Fume-Slag Ternary Binders for Production of Durable Concrete by R. Doug Hooton, Professor, University of Toronto, Toronto, ON, Canada Download the PDF
Ternary Blends and More: Durability by R. Michael D.A. Thomas, Professor, University of New Brunswick, Fredericton, NB, Canada
Use of High-Strength Concrete in Tall Buildings (ACI Spring Convention, April 2015, Kansas City, MO)
The objective of the session is to inform practitioners and engineers on the use of high-strength concrete (HSC) in tall buildings. There has been a significant amount of research regarding the development of HSC, but the learning outcomes of this session include topics related to the delivery, placement, testing (including in-place), and case studies of HSC in tall buildings.
Testing High-Strength Concrete in Chicago by R. Walter H. Flood IV, Manager/Engineer, Flood Testing Labs Inc., Chicago, IL Download the PDF
Successful High-Strength Concrete in Tall Buildings in North America by William S. Phelan, Senior Vice President of Marketing & Technical Services, The Euclid Chemical Co., East Brunswick, NJ
The Successful Use of High-Strength Concrete in United States High-Rise Buildings by Cary S. Kopczynski, President/Senior Principal, Cary Kopczynski & Co Inc., Bellevue, WA; and Joe Ferzli, Cary Kopczynski & Co Inc. Download the PDF
The Use of High-Strength Concrete in Tower One of the World Trade Center by Casimir J. Bognacki, Chief of Materials, The Port Authority of New York & New Jersey, New Hyde Park, NY
High-Strength, High-Performance Iconic Supertall Towers: Trump Tower, Chicago, USA; Cayan Tower, Dubai, UAE; Burj Khalifa, Dubai, UA by Bradley S. Young, Associate Director, Skidmore, Owings & Merrill LLP, Chicago, IL
2015 ACI Fall Convention, Denver, CO
ABC Connections for Seismic-Resistant Design (ACI Fall Convention, October 2015, Denver, CO)
ABC connections for concrete bridges are becoming more common in practice. It is the goal of this session to assess the current state of the art in research and practice regarding the use of ABC connections for the seismic design of concrete bridges.
Connections for ABC in Seismic Regions by John F. Stanton, Professor, University of Washington, Seattle, WA
Seismic Behavior of Pipe Pin Connections for Accelerated Bridge Construction by Ali Mehrsoroush, University of Nevada, Reno
Experimental Evaluation and Analytical Simulation of Bridge Column to Footing Joints Connected Using Grouted Splice Sleeves by Chris P. Pantelides, Professor, University of Utah, Salt Lake City, UT
BIM for Cast-in-Place Concrete (ACI Fall Convention, October 2015, Denver, CO)
The objective of the session is to inform ACI members of the progress made by ACI Committee 131 on developing open information exchange between various software products used in the concrete supply chain. The information delivery manual (IDM) and model view definitions (MVD) developed by the committee will be presented and explained. A presentation will also be made of state-of-the-art applications of BIM in the concrete supply chain.
Introduction to Industry Foundation Classes (IFC) and the Role of Information Delivery Manuals (IDM) and Model View Definitions (MVD) by Charles M. Eastman, Professor, Georgia Institute of Technology, Atlanta, GA
An Overview of ACI 131.1 IDM for Cast-in-Place Concrete by Allan P. Bommer, Chief Design Engineer—Structural Concrete Products, Bentley Systems Inc., Seattle, WA
A Model-Based Process for the Reinforced Concrete Value Chain by Peter J. Carrato, BIM Manager, Bechtel Corporation, Frederick, MD
BIM Implementation by the Concrete Contractor by William M. Klorman, President/CEO, W. M. Klorman Construction Corp, Woodland Hills, CA
BIM in Formwork Applications: A Case Study by Andrew R. Lloyd, Engineering Manager, MEVA Formwork Systems, Inc., Wake Forest, NC
The Future of BIM in Cast-in-Place Concrete by Julian Kang, Associate Professor, Texas A&M University, College Station, TX
Cement-Admixture Interaction (ACI Fall Convention, October 2015, Denver, CO)
The session will discuss various test methods that can be used to evaluate early stiffening of cement paste or mortar to anticipate complex cement-admixture interactions. The session will also highlight recent findings aiming at understanding the physical and chemical phenomena affecting the adsorption of chemical admixtures on binder materials and the resulting effects on fresh and hardened properties of concrete. The session should be of interest to researchers, concrete engineers, material suppliers, and students dealing with modern materials design and construction. Attendees will become aware of recent advances in testing techniques and governing mechanisms affecting cement-admixture interaction.
Modified ASTM C359 Early Stiffening of Mortar to Anticipate Complex Cement Admixture Interactions by Ara A. Jeknavorian, President, Jeknavorian Consulting Services, Chelmsford, MA
Measuring Cement Paste Rheology Using a Modified Dynamic Shear Rheometer: An Approach to Detect Cement Admixtures' Incompatibilities by Anol K. Mukhopadhyay, Research Scientist and Graduate Faculty, Texas A&M Transportation Institute, Texas A&M University, College Station, TX
Cementitious Materials for Nuclear Waste Storage and Disposal (ACI Fall Convention, October 2015, Denver, CO)
Cementitious materials have widespread use in nuclear waste storage and disposal applications, including waste form stabilization, dry storage structures, and repository applications, and in each application, the use of cement-based materials presents unique challenges. For cement-stabilized wastes and repository applications, the transport of radionuclides through the cementitious materials is of great concern, as certain radionuclides are highly mobile in high-pH pore fluid. For intermediate-term dry storage, thermal, radiation, and environmental loading can influence degradation of the portland cement concrete structures, which in turn impacts safe storage.
This session addresses the measurement and modeling of properties that will improve the understanding and prediction of the long-term structural, hydraulic, and chemical performance of cementitious materials used in nuclear waste disposal.
Performance of Deteriorated Dry-Cask Storage Systems Subjected to Impact Loading by Bora Gencturk, Assistant Professor, University of Houston, Houston, TX
Concrete Over Packs in Dry-Cask Storage Containment Units by Samuel Johnson, Electric Power Research Institute, Charlotte, NC
Development of Ultra-High-Performance Concretes for Dry Cask Waste Storage Applications by Brian H. Green, Research Geologist, U.S. Army Corps of Engineers—Engineer Research & Development Center, Vicksburg, MS
Chloride Limits and Thresholds for Concrete Containing Supplementary Cementitious Materials (SCMs) (ACI Fall 2015 Convention, Denver, CO)
ACI uses cement content alone as the basis for allowable chloride limits for new construction. With the heightened use of SCMs and performance specifications for cement, there is need to evaluate using total cementitious materials content as the basis for allowable chloride limits in new construction and for chloride thresholds. These allowable and critical chloride values, along with other important factors, can significantly impact the service life of reinforced concrete structures. The purpose of these sessions is to inform the audience of recent research in these areas so that recommendations on the allowable and critical chloride values can be evaluated and validated. This session will be useful for researchers, engineers, consultants, and those developing standards and specifications.
Effect of Fly Ash and Silica Fume on Time to Corrosion Initiation for Specimens Exposed Long-Term to Seawater by Francisco Presuel-Moreno, Florida Atlantic University
Concrete with Recycled Materials (ACI Fall 2015 Convention, Denver, CO)
Concrete is one of the most widely used construction materials in the world. However, the production of portland cement, an essential constituent of concrete, leads to the release of significant amount of carbon dioxide, a greenhouse gas. It also leads to depletion of aggregate and water resources.
Environmental issues are playing an important role in the sustainable development of the cement and concrete industry. A sustainable concrete structure or infrastructure is concrete which is constructed which minimizes the environmental impact through its life cycle, Concrete is considered sustainable material. It has low inherent energy requirements, it's produced to order with little waste, it's made from plentiful resources and can be made with recycled materials and recycled crushed aggregates, and it is recyclable itself. Many recycled materials that can be used in concrete, starting from recycled water and recycled aggregates and recycled by-product materials can be implemented in many different concrete structure applications.
Structural Performance of Recycled Asphalt Pavement Self-Consolidating Concrete by Yasser A. Khodair, Associate Professor, Bradley University, Peoria, IL; and Ahmed Abdel-Mohti, Ohio Northern University
Can We Recycle Recycled Coarse Aggregates (RCA)? How Many Times? by Dr. M. Shahria Alam, P. Engineering, The University of British Columbia
Recycled Concrete Aggregates for Improved Sustainability of Reinforced Concrete Structures by Robert D. Devine, Civil & Environmental Engineering & Earth Sciences, University of Notre Dame
Curing—Finish the Construction (ACI Fall 2015 Convention, Denver, CO)
Curing is an often-overlooked part of the concrete construction process. When planning for constructability, don't forget to plan for curing. This course will be useful to all participants in concrete construction projects.
Overview of the New ACI 308R-15 Guide to External Curing of Concrete by Lawrence Homer Taber, Black & Veatch
Effect of Different Periods of Moist Curing on Near Surface Drying and Sorption of Fluids by R. Doug Hooton, University of Toronto
Discussion of Maryland State Highway Administration's Experience in Minimizing Bridge Deck Cracking through the Implementation of a Specification Requiring Early Wet Curing of the Concrete by B. Prenger, Lafarge Cement
Deflections and Construction Tolerances: The Good, the Bad, and the Ugly (ACI Fall Convention, October 2015, Denver, CO)
Demands for thinner, lighter structures, coupled with advances in material strengths, construction techniques, and structural analysis software, make serviceability an increasingly important limit state for modern concrete buildings and bridges. This session tackles concrete issues related to deflections, particularly through the lens of constructability. The session will highlight project successes and misfires and delve into reasons leading to the outcomes.
350 Mission: High-Performance Flat-Plate Post-Tension Design with Innovative Multi-Story Construction Methodologies by Eric S. Peterson, Senior Superintendent, Webcor Builders, Knightsen, CA
Effect of Early-Age Material Properties on Concrete Slab Deflections by Caitlin Mancuso, Student, University of Western Ontario, London, ON, Canada
Incremental and Total Long-Term Deflection Calculation (Including the Effect of Construction Loads) Using SAFE by Kevin MacLean, Associate, Read Jones Christofferson Ltd., Toronto, ON, Canada
Planning for the Control of Construction Tolerances and Deflections by Eamonn F. Connolly, Structural Engineer, James McHugh Construction Co, Chicago, IL
Elevated Concrete Floor Slabs: How to Be on the Level by Douglas Sarkkinen, Principal, Otak Incorporated, Battle Ground, WA
Lessons Learned from Deflection Issues during Construction by Bruce A. Suprenant, Senior Construction Engineer, American Society of Concrete Contract
Design and Performance of Concrete Bridges and Buildings When Interacting with Soils and Foundations (ACI Fall Convention, October 2015, Denver, CO)
This special session will emphasize the design and performance of concrete bridges and buildings with consideration for interaction with soils and foundations, including deep or shallow foundations. Given soil structure interaction as being a critical factor in the design of most buildings and bridges, a technical forum is needed to exchange current knowledge and develop research needs. Presentations will encompass a wide variety of technical issues such as the effect of differential settlement on the behavior of structures, backfills for bridge abutment, and earthquake-induced responses of structures. Both experimental and analytical investigations are of interest. The session brings to light recent research findings and provides an opportunity to discuss present challenges and technical issues. Critical information is provided to those who lead tomorrow's structural design and construction in conjunction with soils and foundations, including practicing engineers, government officials, and academics.
Identification of Soil-Foundation Dynamic Stiffness from Seismic Response Signals by S.F. Ghahari, Post-Doctoral Research Assistant, University of California, Los Angeles, CA
Soil Structure Interaction under Semi Static Loads in an Integral Abutment Bridge by Miguel Muñoz, PhD Candidate, Fuzhou University, Fuzhou, China
Emerging Technologies in Civil Infrastructure (ACI Fall Convention, October 2015, Denver, CO)
The session's aim is to highlight some of the current emerging industry technologies identified by SDC. This particular session will present overviews of newer curing technologies currently or soon to be impacting the concrete industry. They are in various stages of and directly involved in their implementation and further development.
Recent Developments in Concrete Curing Monitoring by Dan Zollinger, Professor, Texas A&M University, College Station, TX
Hot Topic Session: Constructability of Projects Designed for 100+ Year Service Life (ACI Fall Convention, October 2015, Denver, CO)
This Hot Topic Session addresses aspects of construction on projects that demand a 100+ year service life. The session will provide perspectives from the diverse set of players involved in these projects. This includes owners charged with balancing the requirements of the project with the expectations of the public; design engineers who must develop plans and specifications that must address the complexity of the structural, durability, and constructability requirements of the project; contractors who must implement these demands; and materials testing laboratories that need to validate the durability of the materials.
What Can the Owner Expect to Get with a 100-Year Service Life Specification? by Ramon L. Carrasquillo, Founder and President, CA Associates, Ltd, Austin, TX
Submittal and QC/QA Reports to Meet Project Service Life Performance Requirements by Paul G. Tourney, President, Tourney Consulting Group, Kalamazoo, MI
Legacy of Per Fidjestøl (ACI Fall Convention, October 2015, Denver, CO)
Per Fidjestøl was a pioneer in the concrete industry. An ACI Fellow and Honorary ACI member, Fidjestøl spent 45 years in the concrete industry. During the tenure of his concrete career, Fidjestøl contributed to the development of high-performance concrete incorporating silica fume for sustainable construction. The purpose of this session is to honor both the legacy of Per Fidjestøl's early work with concrete and highlight some of the current state-of-the-art research. Ultimately, the technical session is designed to celebrate the 45 years that Fidjestøl contributed to advancing the sustainable development of concrete structures. We celebrate not only his involvement in new concrete technologies but also how he educated the industry. Whether through his many appearances at conferences across the world or as a Professor at the University of Agder, Fidjestøl helped cultivate and refine a new generation of concrete scientists and engineers.
Long-Term Chloride Intrusion in Field-Exposed Concrete with and without Silica Fume by Doug Hooton, Professor, University of Toronto, Toronto, ON
Parking Structures, Case Histories by Anthony N Kojundic, Technical Sales, Elkem Materials Inc., Pittsburgh, PA
The Storebaelt Link-First Major Use of Ternary Blend Concrete-1 Million Cubic Meters by Robert C. Lewis, Technical Marketing Manager, Elkem Silicon Materials, Reading Berkshire, United Kingdom
SHM Real-Life Applications (ACI Fall Convention, October 2015, Denver, CO)
Structural health monitoring (SHM) is a process aimed at providing actionable, accurate, and in-time information concerning structural health condition and performance of concrete structures. The information obtained from monitoring is generally used to plan and design maintenance activities, to increase the safety and to mitigate post-event consequences, to verify hypotheses, to reduce uncertainty, and to widen the knowledge concerning the concrete structure being monitored. While SHM benefits have great promise, SHM is still not applied in a widespread manner, and the end users are frequently reluctant to apply it.
The aims of this session are to pull together several examples of SHM real-life applications, raise awareness about how the SHM is applied, understand:
1. The overall behavior of concrete structure, and identify related challenges; and
2. To present case studies of SHM real-life applications and assess the corresponding SHM benefits, and present them to interested parties and broader public by presentations during the session.
Live Load Test and Long-Term Monitoring of the Varina Enon Bridge by Carin L. Roberts Wollmann, Professor, Virginia Tech, Blacksburg, VA
Long-Term Monitoring of Pretensioned Bridge Piles in Salt Water by H R Trey Hamilton, Professor, University of Florida, Gainesville, FL
Performance Measurement of Voided Slab Concrete Bridge Synergy of Current and Emerging SHM Technologies by Devin K. Harris, Associate Professor, University of Virginia, Charlottesville, VA
Monitoring the Structural Health of a Bridge during Fatigue Repair and Rehabilitation with a New Lightweight Concrete Deck by Michael C. Brown, Associate Director, Virginia Transportation Research Council, Charlottesville, VA
Comparative Analysis of Different Technologies to Measure the Vertical Deflection in High-Span High-Rise Concrete Box-Girder Viaducts by Miguel Angel Vicente, Professor, University of Burgos, Burgos, Spain
Strain-Based Monitoring of the Streicker Bridge Using Fiber-Optic Sensors by Branko Glisic, Associate Professor, Princeton University, Princeton, NJ
Short- and Long-Term Field Evaluation of Pavements at O'Hare International Airport by Jacob Henschen, Assistant Professor, Valparaiso University, Valparaiso, IN
2014 ACI Spring Convention, Reno, NV
The ACI 562 Code (ACI Spring Convention, March 2014, Reno, NV)
The development, approval, and adoption of the ACI 562 Code for Evaluation, Repair and Rehabilitation of Existing Concrete Structures represents a milestone in the concrete repair industry. For the first time, a code has been developed to specifically address and provide code requirements for the repair of existing concrete structures. The session will describe key features of ACI 562, describe the process for adoption of ACI 562 into general building codes, and present the process for ongoing development of ACI 562.
History and Background of the ACI 562 Code by Lawrence F. Kahn, Professor, Georgia Institute of Technology, Atlanta, GA
Chapter 1—The ACI 562 Code by Gene R. Stevens, Principal, JR Harris & Co Structural Engineers, Denver, CO
The Building Official's Perspective by Constadino (Gus) Sirakis, Executive Director of Technical Affairs, NYC Buildings, New York, NY
Evaluation of Existing Concrete Structures by Carl J. Larosche, Principal, Wiss, Janney, Elstner Associates, Inc., Austin, TX
Structural Design Requirements for Concrete Repair by Eric L. Edelson, Vice President, Edelson Consulting Group, LLC, Potomac, MD
Durability Requirements in ACI 562 by Fred R. Goodwin, Fellow Scientist, BASF Construction Chemicals, Beachwood, OH
Chapters 9 and 10—Construction and Quality Assurance by Jay H. Paul, Senior Principal, Klein & Hoffman Inc., Chicago, IL
ACI 563—Specifications for Repair by Marjorie M. Lynch, President, Lynch Consulting Engineers, New York, NY
Contractors' Day Session: Bridges that Endure (ACI Spring Convention, March 2014, Reno, NV)
Concrete Bridges in the region face numerous obstacles to endure: seismic loading, severe climatic conditions, marine environments, and high wind loading. Learners will hear how each of these obstacles was overcome for two signature bridge projects in Nevada and California.
Controlling Shrinkage Cracking in Bridge Decks by Ric Maggenti, Senior Materials and Research Engineer, California Department of Transportation, Sacramento, CA
Current Practices in Online Learning (ACI Spring Convention, March 2014, Reno, NV)
This session will provide information on the most current practices related to online learning to include webinars; online courses for credit; and hybrid courses where students view course material online, then work on problems during class.
Effectiveness of Elementary Engineering Outreach with Personal Instruction and Videos by Tyler Ley, Associate Professor, Oklahoma State University, Stillwater, OK Download the PDF
Lessons from an Inverted Classroom by Shawn P. Gross, Associate Professor, Villanova University, Villanova, PA Download the PDF
ACI's Online Programs for Education of the Concrete Professional by Michael L. Tholen, Managing Director, Professional Development, American Concrete Institute, Farmington Hills, MI Download the PDF
Teaching Engineering Online by Ruth Wertz, Assistant Professor of Civil Engineering, Valparaiso University, Valparaiso, IN
Strategies to Strengthen Online Course Instruction by Michael Ciocco, Director of Online Services, Rowan University, Glassboro, NJ Download the PDF
Hot Topic Session: Moisture in Concrete Slabs (ACI Spring Convention, March 2014, Reno, NV)
Due to several changes in the construction market, including EPA regulation changes to the allowable VOC content in adhesives and the rise of fast-track construction projects, moisture-related flooring failures have become more prevalent in concrete slab construction. In response, contractors have been seeking ways to combat these problems without impacting construction schedules. The panelists, including a general contractor, vapor-barrier manufacturer, national consulting firm specializing in moisture testing, and a national flooring consultant, will provide a 360-degree view of this important topic.
Moisture Related Flooring Failure: The Causes and the Problems that Result by Ryan Henkensiefken, P.E., Business Development Engineer, Central Concrete, San Jose, CA
Moisture in Concrete Storage, Migration, Measurement by Ned Lyon, P.E., Staff Consultant, Simpson Gumpertz & Heger, Waltham, MA
Mitigating the Effects of Moisture in Concrete Subfloors by Peter Craig, FACI, FICRI, Concrete Floor Specialist, Concrete Constructives, Greene, ME
Hydration of Low Portland Cement Binders: Industry Experience and Needs (ACI Spring Convention, March 2014, Reno, NV)
This session will showcase new advances in experimental, theoretical, and computational tools for characterizing cements, IBPs, natural minerals, and hydration and microstructure development in low-cement-content concrete binders. The technical content should be of great interest to both the academic and industrial community and of special interest to those involved in sustainable materials design and development, those who specify binder materials to be used in construction, and those who promulgate standards and codes for using low-cement-content concretes.
The Development and Commercialization of Low-Portland-Cement Concrete in the San Francisco Bay Area by Ryan A. Henkensiefken, Technical Services Supervisor, USC Technologies, San Jose, CA Download the PDF
Current Practice on the Use of Admixtures to Enable Successful Manufacture of Concrete with Low Portland Cement Content by Josephine H. Cheung, Principal Scientist, WR Grace, Cambridge, MA Download the PDF
Concrete of the Future: Overcoming the Challenges of Using Low Portland Cement Mixtures by Jussara Tanesi, Concrete Materials Engineer/Lab Manager, FHWASES & Associates, Vienna, VA
Monitoring for Cold Weather Concreting (ACI Spring Convention, March 2014, Reno, NV)
The current model for cold weather concreting operations is based on the Thermos Concept–make the concrete hot and then keep it hot. The bulk of the technical aspects of the current ACI 306 document are based on work done over 30 years ago. The practice of cold weather concreting has changed significantly since that time. The changes in cement chemistry and fineness, the widespread use of slower-reacting materials in the interest of sustainability, as well as the ubiquity of the Internet and electronic sensors needs to be incorporated into the revisions to the guide to cold weather concreting as well as to the specification currently under development.
Cold Weather Research Findings for Residential Concrete Foundation Walls by James R. Baty, Technical Director, Sauter Baty Associates, Mount Vernon, IA Download the PDF
Effect of Frozen Rebar on Surrounding Concrete During Cold Weather Placement by Ronald L. Kozikowski, Materials Engineer, Northstarr Concrete Consulting, Dover, NH
Proportioning of Mixtures for Concrete Pavements (ACI Spring Convention, March 2014, Reno, NV)
This session will provide insight into current developments regarding mixture design and proportioning, specifically for concrete pavements. The session will include discussions of current issues and innovations related to mixture design, including use of self-consolidating mixtures, optimization of aggregate gradation, handling of various durability situations, and mixture component incompatibilities. The speakers have different backgrounds and come from material suppliers, associations, consulting, and academia.
ACI 325, Guide for Design and Proportioning of Concrete Mixtures for Pavements by David Newton Richardson, Associate Professor, Missouri S&T, Rolla, MO
Proportioning Mixtures for Concrete Pavements by Peter C. Taylor, Associate Director, National Concrete Pavement Technology Center, Ames, IA
Alternative Testing Strategies for Support of Concrete Pavement Mixture Development by Tim Cost, Senior Technical Service Engineer, Holcim (US) Inc., Canton, MS
Impact of Sand Gradation on Optimized Graded Concrete for Concrete Pavements by Tyler Ley, Assistant Professor, Oklahoma State University, Stillwater, OK
Seismic Assessment of Existing Reinforced Concrete Buildings (ACI Spring Convention, March 2014, Reno, NV)
ACI Committee 369 is working with ASCE Committee 41 on the state of the art of seismic assessment of reinforced concrete buildings. These sessions will present potential updates for ASCE 41 and summarize work done by committee members on modeling parameters and acceptance criteria for concrete components, including columns, joints, and walls. Example applications of ASCE 41-13 to existing concrete buildings will also be presented. This session will be of value to practicing engineers engaged in seismic retrofit projects using ASCE 41.
Collapse Assessment of Non-Ductile, Retrofitted, and Ductile Reinforced Concrete Frames by Majid Baradaran Shoraka, Postdoctoral Fellow, University of British Columbia, Vancouver, BC, Canada
Nonlinear Modeling Parameters for Jacketed Columns Used in Seismic Rehabilitation of RC Buildings by Jose Alvarez, PhD Candidate, University of Massachusetts Amherst, Amherst, MA
Seismic Assessment and Retrofit of Existing RC Buildings: Case Studies from Degenkolb Engineers by Insung Kim, Project Engineer, Degenkolb Engineers, San Francisco, CA
Structural Evaluation and Code Compliance: Sacred Heart University 1904 Original Building and Addition Complex by Jose M. Izquierdo-Encarnación, Owner, PORTICUS, San Juan, PR
Unconventional Reinforced Concrete Bridge Columns (ACI Spring Convention, March 2014, Reno, NV)
New trends in innovative design and construction of unconventional concrete columns will be presented to promote advancement in this important application. The sessions will include the use of innovative materials, new confinement techniques, and fiber-reinforced concrete. It also includes varying the loading patterns and the geometry of the columns.
Use of Post-Tensioning in Columns to Mitigate Earthquake Damage by David H. Sanders, Professor, University of Nevada, Reno, Reno, NV Download the PDF
Concentric and Eccentric Behavior of Rectangular Columns Confined by Steel Ties and FRP Wrapping by Ahmed Al-Rahmani, Student, Kansas State University, Manhattan, KS Download the PDF
Replacement of the Sellwood Bridge by Mike Lopez, Design Engineer, TYLin International, Salem, OR Download the PDF
Confinement Model for Bridge Columns Using Cross Spirals by Riyadh A. Hindi, Associate Professor, Saint Louis University, Saint Louis, MO Download the PDF
Seismic Assessment of Existing Reinforced Concrete Buildings—New Developments (ACI Spring Convention, March 2014, Reno, NV)
Nonlinear Modeling Parameters and Acceptance Criteria for Concrete Columns by Wassim M. Ghannoum, Assistant Professor, University of Texas at Austin, Austin, TX Download the PDF
Assessment of Concrete Column Provisions of ASCE 41 Using a Shaking Table Test Database by Kenneth J. Elwood, Professor, University of British Columbia, Vancouver, BC, Canada Download the PDF
2014 ACI Fall Convention, Washington, D.C.
Advances in Pervious Concrete (ACI Fall Convention, October 2014, Washington, D.C.)
This session focuses on disseminating the advances that have happened in the field of pervious concretes, in material design, proportioning, properties, standards development, and field applications.
Effects of Silica Fume on Pervious Concrete Performance and Durability by John T. Kevern, Assistant Professor of Civil Engineering, University of Missouri-Kansas City, Kansas City, MO
Development of Portable Devices for Characterizing the Workability of Pervious by Betiglu Jimma, Student, Clemson University, Central, SC
Importance of Site Design to Pervious Concrete Pavements by Scott Erickson, NRMCA Pervious Craftsman
Observations of Corrosion of Reinforcement in Pervious Concrete: Laboratory Results Inspired by Field Performance by George W. Seegebrecht, Senior Evaluation, Concrete Consulting Engineers LLC, Westchester, IL
Overview and Recap of ACI's Pervious Concrete Student Competition by Walter H. Flood IV, Manager-Engineer, Flood Testing Labs Inc., Chicago, IL
Development of a New Test Method for Determining the Surface Infiltration Rate of Permeable Unit Pavement Systems by David R. Smith, Technical Director, Interlocking Concrete Pavement Institute, Chantilly, VA
Aggregate Optimization and Packing (ACI Fall Convention, October 2014, Washington, D.C.)
The mechanical properties of portland cement concrete, such as mechanical strength, modulus of elasticity, creep, and shrinkage, greatly depend on the properties of their main constituent: the aggregates. Packing density, compaction degree, particle size, and spatial distribution of aggregates affect the macromechanical behavior of concrete. This session will discuss how better aggregates' packing and optimal distribution can improve the performance of concrete.
What Aggregate Packing is Optimal? by Eric P. Koehler, Director of Quality, Titan America, Miami, FL Download the PDF
Development and Implementation of Aggregate Grading for Pavements and Structures by Tyler Ley, Associate Professor, Oklahoma State University, Stillwater, OK Download the PDF
Aggregate Optimization for Concrete Mixtures with Low Cement Factor by Mohamadreza Moini, MS Student, University of Wisconsin – Milwaukee, Milwaukee, WI Download the PDF
3-D Aggregate Shape Analysis and Packing Model by Edward J. Garboczi, Fellow, Applied Chemicals and Materials, National Institute of Standards and Technology, Boulder, CO Download the PDF
Particle Packing from a Rock's Perspective by James M. Shilstone, Jr., Concrete Technologist, Command Alkon, Inc., Frisco, TX Download the PDF
Celebrating 100 Years of John Joseph Earley and the Earley Studio Work (ACI Fall Convention, October 2014, Washington, D.C.)
This session will be dedicated to M. K. (Mary Krumboltz) Hurd, The Woman Who Formed Concrete. Architectural concrete and ACI pioneer John J. Earley left a legacy of distinctive work throughout the United States, but nowhere more than in Washington, DC. These sessions will present some of the outstanding Earley Studio projects in the nation's capital and other parts of the country. The history of John J. Earley's innovation will highlight distinctive features at Meridian Hill Park, the Shrine of the Sacred Heart, the Polychrome Houses, and the Franciscan Monastery of the Holy Land in America. These spectacular projects illustrate the revolutionary work done in concrete nearly 100 years ago. You will be amazed by concrete's resilience and aesthetic durability.
Repairing Old Concrete at Meridian Hill Park, Washington, D.C. by Robert A. Weinstein, President, Architrave P.C., Washington, D.C.
Time Goes, You Say? Ah, No, Alas, Time Stays: We Go by Kimberly Waggle Kramer, Director of Graduate Studies, Kansas State University, Manhattan, KS
Secrets of John Earley's Mosaic Concrete on the Baha'i Temple by Robert F. Armbruster, President, The Armbruster Company Inc., Northbrook, IL
Repairing Old Concrete at Meridian Hill Park by Judith M. Capen, Architrave P.C., Washington, D.C.
John Earley's Mosaic Art—Saints, Dinosaurs, and Battle Ships by Robert F. Armbruster, President, The Armbruster Company Inc., Northbrook, IL
Current-Day Architectural Concrete by Larry Rowland, Manager-Marketing Technical Services, Lehigh White Cement Company, Allentown, PA
Emerging Technologies in Civil Infrastructure (ACI Fall Convention, October 2014, Washington, D.C.)
The goal of the ACI Foundation's Strategic Development Council (SDC) is industry-wide collaboration to address the concrete industry's technological challenges and to create a forum for the introduction and nurturing of new technologies. This session highlights issues of importance in the concrete industry and overviews of newer technologies currently or soon to be impacting the concrete industry. The presentations are by individuals who are both well-versed in the specific issue or technology and directly involved in their implementation and further development.
NRC Participation and Perspectives on Codes and Standards for Nuclear Construction by Carol E. Moyer, Team Leader, International Programs, U.S. Nuclear Regulatory Commission, Washington, D.C. Download the PDF
An Update on EPRI Concrete Research by Kenneth F. Barry, Technical Executive, EPRI, Charlotte, NC Download the PDF
James K. Wight: A Tribute from His Students and Colleagues (ACI Fall Convention, October 2014, Washington, D.C.)
This session is aimed at disseminating information related to past and current research on behavior of reinforced concrete flexural members and walls, as well as on structural collapse.
Design of Discontinuity Regions of Earthquake-Resisting Structural Walls by Jack P. Moehle, T.Y. and Margaret Lin Professor of Engineering, University of California, Berkeley, Berkeley, CA
Deformation Capacity and Strength of RC Frame Members Constructed with High-Strength Materials by Min Yuan Cheng, Assistant Professor, National Taiwan University of Science and Technology, New Taipei City, Taiwan
Shear Strength of RC Flexural Elements Reinforced with T-Headed Transverse Reinforcement in Safety-Related Nuclear Facilities by Michael E. Kreger, Garry Neil Drummond Endowed Chair in Civil Engineering, University of Alabama, Tuscaloosa, AL
Reinforced Concrete in Motion: A Retrospective of Developments on Knowledge Related to Flexural Response of Reinforced Concrete by Mete A. Sozen, Kettlehut Distinguished Professor, Purdue University, West Lafayette, IN
Self-Consolidating Concrete for Precast/Prestressed Applications (ACI Fall Convention, October 2014, Washington, D.C.)
The hardened properties and performance of self-consolidating concrete (SCC) developed for use in precast prestressed applications will be discussed. Presentations will specifically focus on SCC mechanical properties, durability, time-dependent behavior, structural behavior, and case studies that document the use of SCC in full-scale precast prestressed applications.
A Review of Creep and Shrinkage of Self-Consolidating Concrete for Prestressed Applications by Royce W. Floyd, Assistant Professor, University of Oklahoma, Norman, OK
Precast Prestressed Concrete Truss Using Self-Consolidating Concrete by George Morcous, Associate Professor, University of Nebraska-Lincoln, Omaha, NE
A Probabilistic Model for Predicting Early-Age Creep Deformation of Self-Consolidating Concrete Members by Young Hoon Kim, Assistant Professor, University of Louisville, Louisville, KY
Structural Health Monitoring of Concrete Structures (Durability)—Tribute to Richard Weyers (ACI Fall Convention, October 2014, Washington, D.C.)
Sponsored by ACI Committees 444, Structural Health Monitoring and Instrumentation; 209, Creep and Shrinkage in Concrete; 222, Corrosion of Metals in Concrete; 345, Concrete Bridge Construction, Maintenance and Repair; 348, Structural Reliability and Safety; 365, Service Life Prediction; 435, Deflection of Concrete Building Structures; and Joint ACI-ASCE Committees 343, Concrete Bridge Design, and 441, Reinforced Concrete Columns.
Corrosion of Reinforcement in High-Performance Concrete by Michael M. Sprinkel, Associate Director, Virginia Center for Transportation Innovation and Research, Charlottesville, VA Download the PDF
Evaluation of the Proposed European Rapid Screening Test for Stainless Steel Reinforcing Bar by Carolyn M. Hansson, University of Waterloo Download the PDF
Utilizing Large Laboratory Specimens to Develop Field Evaluation Techniques for Reinforced Concrete by Neal S. Berke, Vice President, Research, Tourney Consulting Group LLC, Kalamazoo, MI Download the PDF
Use of Passive and Wireless-Based RFID Sensors to Measure Chloride Ingress in Concrete by Tyler Ley, Associate Professor, Oklahoma State University, Stillwater, OK Download the PDF
Modeling the Remaining Service Life of Reinforced Concrete Bridges by David Trejo, Professor and Hal Pritchett Endowed Chair, Oregon State University, Corvallis, OR
Sustainable Performance of Concrete Bridges and Elements Subject to Aggressive Environments: Monitoring, Evaluation, and Rehabilitation (ACI Fall Convention, October 2014, Washington, D.C.)
This session will emphasize the sustainable performance of concrete bridges and their elements when subjected to aggressive environments. Presentations will include a variety of technical aspects such as durability of concrete members, performance monitoring technologies, evaluation methodologies, damage assessment, and structural rehabilitation. Both experimental and analytical investigations are of interest. The session brings to light recent research findings and provides an opportunity to discuss present challenges and technical issues. Critical information is given to those who lead tomorrow's bridge design and construction, including practicing engineers, government officials, and academics.
Finite Element Modeling of RC Beams Strengthened with Prestressed NSM-CFRP Strips Subjected to Severe Environmental Conditions by Raafat El-Hacha, Associate Professor, University of Calgary, Canada
Durability and Mechanical Performance of a Sustainable Low-Cement Concrete for DOT Applications by Reza Moini, Research Teaching Assistant, University of Wisconsin – Milwaukee, Milwaukee, WI
Early-Age Cracking in Cast-in-Place Concrete Bridge Decks due to Shrinkage Strain by Baolin Wan, Associate Professor, Marquette University, Milwaukee, WI
Sustainable Earthquake-Resistant Design of Hollow Bridge Columns Using Low-Cost Fiber-Reinforced Cement Composites by Myoungsu Shin, Assistant Professor, Ulsan National Institute of Science and Technology, Ulsan Metropolitan City, South Korea
Monitoring of the 205 ft Precast Girders of the Alaskan Way Viaduct in Seattle, WA by Sameh S. Badie, Associate Professor, George Washington University, Washington, DC
Using GFRP Reinforcing Bar as a Cost-Effective Solution to Extend the Service Life of New and Replacement Bridge Decks: A Case Study of the I-635 Bridge Deck Replacement for the Kansas Department of Transportation by Ryan Koch, FRP Applications Engineer, Hughes Brothers, Seward, NE
Reducing Deck Cracking in Composite Bridges by Controlling Shrinkage and Creep Properties by Fatmir Menkulasi, Assistant Professor, Louisiana Tech University, West Monroe, LA
Analytical Modeling of Reinforced Concrete Beams Strengthened with Mechanically Fastened Fiber-Reinforced Polymers (MFFRP) by Vicki Brown, Widener University
Rapid Repair of Reinforced Concrete Columns Using a Mechanically Fastened Steel Jacket
by Taylor Brodbeck, North Carolina State University