Validation of contractor HMA testing data in the materials acceptance process - phase II : final report.
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2016-08-01
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Edition:Final report
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Abstract:This study conducted an analysis of the SCDOT HMA specification. A Research Steering Committee provided oversight
of the process. The research process included extensive statistical analyses of test data supplied by SCDOT.
A total of 2,789 AC tests, 2,234 AV tests, and 2,230 VMA tests were provided from 20 different projects, with some
projects having multiple Mix Types and JMFs involved. A total of 2,010 density test results also were provided from 15
of the 20 projects. Relatively small amounts of data from certain Courses and Mix Types limited analyses only to
Surface Type A and Surface Type B mixes.
The analyses led to a recommendation that SCDOT switch to using the differences from the AC, AV, and VMA target
values rather than the actual AC, AV, and VMA values. This will allow the possibility of combining test results from
more than 1 JMF in the Lot payment decision.
In addition, SCDOT verification test results were provided from 16 of the 20 projects. These data consisted of 487 AC
and 452 AV and VMA test results from SCDOT. In addition, the data set included 411 AC, and 387 AV and VMA
Contractor verification test results. These data were analyzed to evaluate current SCDOT verification procedures and
issues concerning them were presented and discussed.
Power curves were developed for various sample sizes for the F-test, the two-sample t-test, and the paired-sample t-test
to allow SCDOT to evaluate the risks associated with their current verification procedures as well as any possible
changes to the current procedures.
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