Revised Pay Adjustment Factors for HMA and Concrete Pavements

The current pay adjustment system for hot mix asphalt (HMA) production, placement, and ride consistently rewards contractors, but does not necessarily result in improved performance of constructed HMA pavements and longer service life. The current system needs to be changed in order to improve the quality of pavements in Texas and provide performance-related incentives. A database framework was developed incorporating Texas Department of Transportation's (TxDOT’s) SiteManager quality control/quality assurance (QC/QA) database and network-level performance data in the Pavement Management Information System (PMIS) database, yielding a large dataset comprising more than 600 pavements across Texas with available QC/QA data and performance records spanning 3 to 10 years. The research team evaluated the influence of variations in the construction QC/QA parameters on pavement performance. Advanced statistical modeling of these relationships using econometric approaches was conducted to establish the significance, sensitivity, and consistency of these parameters in regard to pavement performance. The statistical models provided the tools necessary to evaluate the current pay adjustment system with an eye to developing new performance-related specifications. This report provides recommendations for revising the production and placement pay adjustment factors for HMA pavements and revised pay adjustments for the ride quality of HMA and concrete pavements.

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