United States Department of Transportation
i
Illinois’ Experience Using Quality Control for Performance and Pay for Performance To Determine Pay for Hot-Mix Asphalt
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2021-07-01
[PDF-523.83 KB]
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Abstract:The study addressed practical concerns and questions regarding QCP and PFP specifications, which reveal the following key outcomes: Contractors have more experience working with QCP projects. Training of contractors on PWL computations used in the PFP specification is warranted. Although pay incentives (PF>100%) are only possible in the PFP specification, PFP has reported consistently higher CPF pay disincentives than QCP. PFP does not have a maximum disincentive before being deemed as unacceptable material. For QCP, the maximum disincentive is 10% before being deemed as unacceptable material. Pay disincentives in QCP and PFP specifications are caused by several factors that require collaborative efforts to address them by agency and contractors. In the QCP specification, the performance of the contractors for individual pay factors (field density, AV, and VMA) is similar. The QCP specification is more lenient than that of PFP, especially for the density pay factors. When the PFP specification is used, the factor driving the pay disincentive is frequently related to the construction stage (field density), because of variability. Approximately, 82%, 88%, and 91% of field density, VMA, and AV, respectively, are statistically similar when comparing contractor and agency test results. Hence, production is highly impacting the pay. Both mix production and construction issues cause contractors’ pay loss. Production and construction control are important to increase pay and improve HMA constructed quality. IDOT’s Quality Management Program for HMA is appropriate for identifying mix production and/or construction issues and assigning pay correspondingly. Consistency in sampling and testing are required to limit variability between contractors and agencies.
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