Evaluation of the Performance of Warm Mix Asphalt in Washington State
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2012-10-01
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Edition:Final report.
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Abstract:Warm mix asphalt (WMA) is a relatively new and emerging technology for the asphalt industry.
It offers potential construction and environmental advantages over traditional hot mix asphalt
(HMA). However, WMA must perform at least as well as HMA before it can be used to replace
HMA. This study evaluates the performance of HMA and WMA mixes obtained from various
field sites in the state of Washington. Different WMA technologies are examined in four separate
projects; these technologies include Sasobit® and three water foaming technologies, Gencor®
Green Machine Ultrafoam GX®, Aquablack™ and water injection. Performance tests are
conducted on the cores and extracted binders to evaluate the resistance of HMA and WMA
samples to fatigue and thermal cracking, rutting and moisture susceptibility. Additionally, the
early-age field performance of WMA and HMA control pavements is compared.
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