Warm Mix Asphalt Final Report

The performance of pavements constructed using warm mix asphalt (WMA) technology was compared to the performance of conventional hot mix asphalt (HMA) pavements placed on the same project. Measurements of friction resistance, rutting/wear, ride and pavement condition (alligator, longitudinal and transverse cracking) did not show that the WMA either improved or worsened performance.

WMA is an allowable substitute for conventional HMA on all projects using less than 20 percent recycled asphalt pavement (RAP). WMA is not allowed when the RAP content exceeds 20 percent or when any percentage of recycled asphalt shingles (RAS) is incorporated.
Publication Date: 
Saturday, November 1, 2014
Publication Number: 
WA-RD 723.2
Last modified: 
10/12/2016 - 15:41
Keith Anderson, Mark Russell, Jeff Uhlmeyer, Jim Weston, Jerry Roseburg, Tim Moomaw, Joe DeVol.
Washington (State). Department of Transportation. Materials Laboratory.
Number of Pages: 
Warm mix asphalt, Paving materials, Hot mix asphalt, Pavement performance, Recycled materials, Alternatives analysis, Asphalt pavements.