Portland Cement Concrete Pavement Joint Sealant Practices and Performance (2021) / Chapter Skim
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Pages 41-48
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41 DOT representatives from six states (Arizona, California, Iowa, Louisiana, North Dakota, and South Dakota) were interviewed to collect additional information on joint sealant practices incorporated into specific projects.
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42 Portland Cement Concrete Pavement Joint Sealant Practices and Performance Joint cleaning consists of five processes -- removing debris, drying, sandblasting, air blasting, and vacuuming -- that are covered in detail by the agency's specifications. The installation is accepted on the basis of constructed dimensions and visual inspection of completed seals for voids.
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Case Examples 43 approval and acceptance procedures and specifications used for PCC pavement joint sealants is effective for product quality assurance. The typical joint width used by the agency is 1⁄8 in.
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44 Portland Cement Concrete Pavement Joint Sealant Practices and Performance finished dimension. Blow the dry sawing residue from the joint with air compressors to provide moisture and oil-free compressed air within 3 hours after a seal is restored to the finished size (Iowa DOT 2015)
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Case Examples 45 South Dakota SDDOT indicated projects with joint sealants demonstrating performance greater than 15 years of service life. Its practices include a 3⁄8 in.
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46 Portland Cement Concrete Pavement Joint Sealant Practices and Performance SDDOT reported that important factors in improving the performance of joint sealant are • "for silicone sealants, to ensure during Inspection the necessary cleanliness to promote a good bond between the sealant and the concrete; also, to recess the sealant a little below the surface of the pavement to minimize contact with the passing traffic while maintaining the proper shape factor" and • "for hot-pour sealant, again to ensure during Inspection the necessary cleanliness prior to sealing to promote bond and enough depth of sealant to prevent loss of bond during the winter months." SDDOT practices include having its maintenance forces carry out occasional spot-fixing with hot-pour sealants on an as-needed basis. Project-level resealing is done only by contract and tends to occur every 12 to 25 years.
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Sealant Life Projects Condition Rating(0–5) Traffic (ADT)
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48 Portland Cement Concrete Pavement Joint Sealant Practices and Performance • Joint sealant design either follows the manufacturer's instructions or is carried out within the scope of ACPA design recommendations. • Most joint preparation procedures are carried out at least twice before installation.
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