United States Department of Transportation
i
Regressing Air Voids for Balanced HMA Mix Design [Final Report]
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2018-09-01
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[PDF-3.48 MB]
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Edition:Final Report, November 2016 - September 2018
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Abstract:This project evaluated the impact of the air voids regression approach on cracking, rutting, and moisture damage resistance of asphalt mixtures. The experimental plan included a total six mixes designed for low, medium, and high traffic levels, with various contents of RAP and RAS. Mixture performance tests included the Illinois Flexibility Index Test to evaluate intermediate temperature cracking resistance, the Disc-Shaped Compacted Tension for low-temperature cracking resistance, and the Hamburg Wheel Tracking Test for rutting and moisture resistance. The results indicate that the regressed air voids concept can improve mixture cracking resistance without compromising the rutting resistance of asphalt mixes. Recommendations to WisDOT include a strategy to be accomplished in three stages: (1) implementation of the 3.0% regressed air voids mix designs without performance tests; (2) continued use of the 3.0% regressed air voids mix designs with added Hamburg rutting criteria based on traffic levels; and (3) implementation of a Balanced Mix Design specification and eventually withdrawing the regressed air voids design requirement.
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