United States Department of Transportation
i
Performance Measures of Warm Asphalt Mixtures for Safe and Reliable Freight Transportation
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2009-04-01
[PDF-3.53 MB]
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Edition:Final Report
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Abstract:Warm mix asphalt (WMA) is an emerging technology that can allow asphalt to flow at a lower temperature for mixing, placing and compaction. The advantages of WMA include reduced fuel consumption, less carbon dioxide emission, longer paving season, longer hauling distance, reduced oxidation of asphalt, early opening to traffic and a better working environment in the field. In the United States, WMA has become popular in recent years. However, to provide a safe and reliable highway for heavier truck traffic with a high tire pressure, WMA mixtures must meet requirements for strength, stiffness, rutting, and moisture resistance. WMA mixtures with six commercially available WMA additives that include CECABASE RT(R), Sasobit(R), Asphalt-min(R), Advera WMA, Evotherm J1, and RedisetTM WMX, along with the control WMA mixture without any additive and the control HMA mixture, were evaluated for their air voids, indirect tensile strengths and moisture susceptibilities. To evaluate a long-term reliable performance over a wide range of traffic and climatic conditions, the dynamic modulus and the repeated load tests were conducted on these mixtures using the simple performance testing equipment. Based on the limited test results, Sasobit(R), Evotherm J1 and RedisetTM WMX were effective in producing WMA mixtures in the laboratory that is comparable to HMA mixtures.
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