Portland Cement Concrete Pavement Joint Sealant Practices and Performance (2021) / Chapter Skim
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30 State of the Practice The purpose of the questionnaire prepared for this synthesis (see Appendix B) was to document joint sealant practices by state DOTs in the United States.
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State of the Practice 31 Questions regarding the following practices and factors had widely varying responses, and in some cases, state agencies did not provide information on these items: • Cleaning procedures • Moisture preparation • Tooling methods/protocols • Factors affecting performance • Resealing criteria General Joint Sealant Practice The survey received responses from 42 out of 50 states (84 percent) , as shown in the top panel of Figure 15.
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32 Portland Cement Concrete Pavement Joint Sealant Practices and Performance Figure 16. Type of joint sealant used by 33 responding state agencies that use sealant (respondents could select multiple answers)
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State of the Practice 33 Figure 18. Map of type of joint sealant used by state DOTs.
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34 Portland Cement Concrete Pavement Joint Sealant Practices and Performance Figure 19. Results of responses (top)
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State of the Practice 35 Table 1 in the previous chapter. Hot-pour sealants should be placed at widths of 3⁄8 in., 1⁄4 in., and 1⁄8 in.; silicone sealants should be placed at width ranges of 3⁄8 in.
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36 Portland Cement Concrete Pavement Joint Sealant Practices and Performance The survey was designed to yield data on the configurations used for each joint type. In the case of hot-pour sealants, the results of the survey indicate that 60 percent of the states install hot-pour sealants with a recessed configuration (rather than the flush-filled configuration recommended by ACPA)
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State of the Practice 37 • The sealant is installed within hours of the final compressed air blasting. They use a single sawcut with no sealant when the PCCP is on a cement-treated base.
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38 Portland Cement Concrete Pavement Joint Sealant Practices and Performance Performance Life The objective of the survey questions was to gain sufficient data to correlate DOTs' current practices with the life span of joint sealants. Most states lack information regarding the life span of their joint sealants.
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State of the Practice 39 most frequent debonding and adhesive separation. The next most frequently occurring distress types are aging and cohesive cracking.
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40 Portland Cement Concrete Pavement Joint Sealant Practices and Performance using alternative methods prefer the reduced maximum joint opening approach. Examples of responses include the following: • The reduced maximum joint opening method has been determined, and a very narrow concrete joint is a single cut and left open.
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