F. Air-entrainment is required for all exterior concrete and as required for Section 32 05 23, CEMENT AND CONCRETE FOR EXTERIOR IMPROVEMENTS. Air content must conform with ACI 318 Table 4.4.1. 2.4 BATCHING AND MIXING A. Store, batch, and mix materials as specified in ASTM C94. 1. Job-Mixed: Mix in a batch mixer in manner specified for stationary mixers in ASTM C94. 2. Ready-Mixed: Comply with ASTM C94, except use of nonagitating equipment for transporting concrete to the site will not be permitted. With each load of concrete delivered to project, concrete producer must furnish, in duplicate, certification as required by ASTM C94. 3. Mixing structural lightweight concrete: Charge mixer with 2/3 of total mixing water and all of the aggregate. Mix ingredients for not less than 30 seconds in a stationary mixer or not less than 10 revolutions at mixing speed in a truck mixer. Add remaining mixing water and other ingredients and continue mixing. Above procedure may be modified as recommended by aggregate producer. SPEC WRITER NOTES: 1. Modify the following to include tighter construction tolerances for placement, alignment, plumbness, straightness, and elevation for formwork for columbarium walls, memorial walls and any specifically identified elements for the project, where the tighter construction tolerances are required for the portions of the concrete that are visible in the final installation. 2. Coordinate the construction tolerances in the specifications so the tighter tolerances from either the drawings or the specifications govern, regardless of the order of precedence for specification information. 3. Recommended that the construction tolerances for the tops of the foundations for the columbarium precast units, and memorial wall precast core be indicated on the drawings. 4. Wherever the foundation for a columbarium or memorial wall element is to be visible in the final installation, the allowable construction tolerance for the exposed portion of the foundation cannot be
F. Air-entrainment is required for all exterior concrete and as required for Section 32 05 23, CEMENT AND CONCRETE FOR EXTERIOR IMPROVEMENTS. Air content must conform with ACI 318 Table 4.4.1. 2.4 BATCHING AND MIXING A. Store, batch, and mix materials as specified in ASTM C94. 1. Job-Mixed: Mix in a batch mixer in manner specified for stationary mixers in ASTM C94. 2. Ready-Mixed: Comply with ASTM C94, except use of nonagitating equipment for transporting concrete to the site will not be permitted. With each load of concrete delivered to project, concrete producer must furnish, in duplicate, certification as required by ASTM C94. 3. Mixing structural lightweight concrete: Charge mixer with 2/3 of total mixing water and all of the aggregate. Mix ingredients for not less than 30 seconds in a stationary mixer or not less than 10 revolutions at mixing speed in a truck mixer. Add remaining mixing water and other ingredients and continue mixing. Above procedure may be modified as recommended by aggregate producer. SPEC WRITER NOTES: 1. Modify the following to include tighter construction tolerances for placement, alignment, plumbness, straightness, and elevation for formwork for columbarium walls, memorial walls and any specifically identified elements for the project, where the tighter construction tolerances are required for the portions of the concrete that are visible in the final installation. 2. Coordinate the construction tolerances in the specifications so the tighter tolerances from either the drawings or the specifications govern, regardless of the order of precedence for specification information. 3. Recommended that the construction tolerances for the tops of the foundations for the columbarium precast units, and memorial wall precast core be indicated on the drawings. 4. Wherever the foundation for a columbarium or memorial wall element is to be visible in the final installation, the allowable construction tolerance for the exposed portion of the foundation cannot be
033053ShortFormCastinPlaceConcrete.docx