United States Department of Transportation
i
Impact of Incentive/Disincentive Specifications on Long-Term Asphalt Pavement Performance
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2022-12-01
[PDF-9.60 MB]
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Edition:Final Report
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Abstract:FDOT’s Percent Within Limits (PWL) specification for acceptance and payment of asphalt materials was first implemented in 2002. The objective of this study was to determine the level of impact that FDOT’s PWL specification has on the long-term performance of asphalt pavements. To meet this objective, Multinomial Logistic Regression Analyses (MLRA) were performed. The results indicated that FDOT’s Composite Pay Factor (CPF) is cost-effective (i.e., the higher the CPF, the lower the probability of distresses). Moreover, it was shown that CPF has a profound effect on cracking and raveling of both dense and open graded mixtures. According to the results of MLRA, it is recommended that FDOT continue to use the AQC weights revised and implemented in 2019 for dense graded mixtures. For open graded mixtures, it is recommended that FDOT explore the option of increasing the weight of Percent Passing 3/8 Inch Sieve (PF_P3.8) by 5 percent and reducing the weight of Percent Passing No. 8 Sieve (PF_P8) by 5 percent.
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