Hot mix asphalt voids acceptance review of QC/QA data 2000 through 2010.
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2011-10-01
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Abstract:This report analyzes the quality control/quality assurance (QC/QA) data for hot mix asphalt (HMA) using
voids acceptance as the testing criteria awarded in the years 2000 through 2010. Analysis of the overall
performance of the projects is accomplished by reviewing the Calculated Pay Factor Composite (CPFC) and
Incentive/Disincentive Payments (I/DP). Analysis of each of the elements: asphalt content, voids in mineral
aggregate (VMA), air voids, mat density, and joint density is presented in tables, figures, and reports. Various
data groupings are used to evaluate the data including: year, region, and grading.
The specification and the projects are performing reasonably well. The results for the data show that quality
of the projects is remaining fairly consistent. No definite upward or downward trends can be seen in the data.
Over the eleven-year time period more projects have received incentive payments than disincentive
payments. The average CPFC over the eleven years evaluation is 1.00569. The quality levels in the
individual elements are at relatively high levels. The VMA and mat density elements show the best results
being above 93 percent within the specification limits. The asphalt content and air voids elements are at
approximately 90 percent. The joint density pay factor is under 1.0 but is expected to rise as contractors gain
experience in this area.
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