Impact of Asphalt Thickness on Pavement Quality (2019) / Chapter Skim
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Pages 44-50
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44 This chapter presents case examples of agencies that have dealt with compaction and thin lifts in a variety of ways. The early experiences of the Florida DOT with excessive permeability of coarse graded Superpave mixes and how they modified their specifications are summarized first.
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Case Examples 45 were officially changed to require fine graded mixes for all traffic levels. This reflects the evolution of the Florida DOT's specifications as it gained experience with the new mix design system.
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46 Impact of Asphalt Thickness on Pavement Quality In addition to being willing to make specification changes to address the issues it was seeing, the Florida DOT was also willing to share its experiences with other agencies. Part of that willingness stemmed from Florida's role as one of the AASHTO Superpave Lead States.
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Case Examples 47 A test strip was required to ascertain if adequate compaction could be achieved. Full depth cores were pulled from the test strip and correlated to nuclear and nonnuclear gauges.
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48 Impact of Asphalt Thickness on Pavement Quality readings are used to monitor compaction during paving. There is no incentive pay for density in these thin lift applications.
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Case Examples 49 • Using WMA as a compaction aid; and • Using new technologies to assess the placement and compaction process, such as intelligent compaction and thermal imaging. Two states in the first phase had test sections allowing comparison of differing NMASs in the same lift thickness (thus yielding differing t/NMAS ratios)
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50 Impact of Asphalt Thickness on Pavement Quality This contractor has made a number of changes to their practices, such as using finer mixes and greater compactive effort. The Bailey method has been used to guide changes in the aggregate gradations to obtain dense, stable mixes while allowing enough room for an adequate film thickness.
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