Install the backer rod. If used, a backer rod, approved by the sealant manufacturer, should be installed. The backer rod should be approximately 25 percent larger in diameter than the width of the joint. Install the new sealant. Joint should be resealed using either a hot-poured thermoplastic sealant, low-modulus silicone sealant, or other thermosetting sealant materials. The general construction process for sealing includes (NHI 2007): Cleaning the crack. The crack should be cleaned with high-pressure air or water followed by sandblasting. Immediately prior to backer rod (if used) and sealant installation, any remaining debris should be removed with water- and oil-free air. Install the backer rod. If used, a backer rod, approved by the sealant manufacturer, should be installed. The backer rod should be approximately 25 percent larger in diameter than the width of the crack. Install the new sealant. The crack should be resealed using either a hot-poured thermoplastic sealant, low-modulus silicone sealant, or other thermosetting sealant materials. Table 10-13. Key characteristics of crack sealing/joint resealing. Pavement Performance Conditions Addressed Contraindications Indicators Affected Functional/Other Extensive structural failure + Mean joint faulting. Longitudinal cracking. (i.e., significant faulting or + Load-related transverse slab Transverse cracking. spalling). cracking. Unsealed/partially sealed + spalling. joints. Different sealant materials can Smoothness (if sealed in an – be expected to have different overband configuration; performance lives; thus, material also, material may bulge Structural Adds no structural benefit, selection should be based on during warmer months). but may reduce rate of expected time until next structural deterioration. treatment. May also postpone time until rehabilitation. Concrete crack sealing is not intended to repair, but instead prevent further deterioration of cracked slabs. Expected Life 4 to 8 years for hot pour; 6 to 10 years for silicone sealant.
Install the backer rod. If used, a backer rod, approved by the sealant manufacturer, should be installed. The backer rod should be approximately 25 percent larger in diameter than the width of the joint. Install the new sealant. Joint should be resealed using either a hot-poured thermoplastic sealant, low-modulus silicone sealant, or other thermosetting sealant materials. The general construction process for sealing includes (NHI 2007): Cleaning the crack. The crack should be cleaned with high-pressure air or water followed by sandblasting. Immediately prior to backer rod (if used) and sealant installation, any remaining debris should be removed with water- and oil-free air. Install the backer rod. If used, a backer rod, approved by the sealant manufacturer, should be installed. The backer rod should be approximately 25 percent larger in diameter than the width of the crack. Install the new sealant. The crack should be resealed using either a hot-poured thermoplastic sealant, low-modulus silicone sealant, or other thermosetting sealant materials. Table 10-13. Key characteristics of crack sealing/joint resealing. Conditions Addressed Contraindications Pavement Performance Indicators Affected Functional/Other Longitudinal cracking. Transverse cracking. Unsealed/partially sealed joints. Structural Adds no structural benefit, but may reduce rate of structural deterioration. May also postpone time until rehabilitation. Concrete crack sealing is not intended to repair, but instead prevent further deterioration of cracked slabs. Extensive structural failure (i.e., significant faulting or spalling). Different sealant materials can be expected to have different performance lives; thus, material selection should be based on expected time until next treatment. + Mean joint faulting. + Load-related transverse slab cracking. + spalling. – Smoothness (if sealed in an overband configuration; also, material may bulge during warmer months). Expected Life 4 to 8 years for hot pour; 6 to 10 years for silicone sealant.