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Illinois Department of Transportation (IDOT) developed two HMA pay specifications, quality control for performance (QCP) and pay for performance (PFP). These specifications assign pay incentives and/or disincentives based on air voids, voids in mineral aggregate, and in-place density. The paper investigated the pay disincentive sources in QCP and PFP projects. Eleven construction contracts were evaluated during the 2018 construction season. First, on-site field observations of contracts were conducted to HMA production, construction, sampling, coring, and testing procedures. Then quality acceptance data were analyzed. Results indicate mix production, and construction issues were the main cause of pay disincentives to the contractors. The production issues found were related to aggregate quality, handling, variability, and contamination as well uncontrolled mix switches. However, there were cases that which testing issues compromised the contractor’s pay. The issues observed included: sample reheating, lab-gyratory compaction bias, and inconsistent volumetric test weights.

road materials and pavement design

Field factors impacting incentives of quality control for performance (QCP) and pay for performance (PFP) specifications for hot-mix asphalt in Illinois