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Warm Mix Asphalt (WMA)

Warm Mix Asphalt (WMA). WMA is an asphalt mixture that can be produced at substantially lower temperatures than traditional asphalt mixes. Temperature reductions = 30 to 100 F Chemical additives/other processes reduce viscosity There is currently intense interest in the U.S. regarding WMA.

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Warm Mix Asphalt (WMA)

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  1. Warm Mix Asphalt (WMA) WMA is an asphalt mixture that can be produced at substantially lower temperatures than traditional asphalt mixes. • Temperature reductions = 30 to 100 F • Chemical additives/other processes reduce viscosity • There is currently intense interest in the U.S. regarding WMA.

  2. Environmental Benefits Conventional HMA Warm Mix Asphalt • Reduced Emissions • Improved Working Conditions • More Compatible with Surrounding Community Photos from presentation at AASHTO Standing Committee on Highways Technical Meeting, Sept. 16, 2005, Nashville, TN

  3. Other Benefits • Significant reduction in fuel needs • Reduce need for increasingly expensive fuel • Reduce overall production costs • Reduced differential in mat temperature and ambient temperature • Open to traffic sooner • Lengthen paving season

  4. Research Objectives • Assess WMA design parameters • Air voids, VMA, Binder Grade and Content • Evaluate Performance • Rutting, Stripping, Compaction • Investigate Curing Process • Sensitivity to temperature • QC/QA Implementation Plan • Methods for measuring quality

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