Regressing Air Voids for Balanced HMA Mix Design Study

Wisconsin Department of Transportation (WisDOT) is working towards increasing the percentage of asphalt binder content due to performance and durability concerns with low asphalt binder in our Hot Mix Asphalt (HMA) pavements. One method to achieve higher content is to use air void regression. In regression, a mix is designed for 4.0 percent air voids and a prediction is made as to the additional virgin asphalt binder needed to obtain 3.5 percent or 3.0 percent, thereby increasing design asphalt content 0.4 percent. Several states, including Illinois and Michigan, have used this method. This study will evaluate the impacts of regression on cracking, rutting and overall pavement performance and validate the appropriate air void target for three mix design categories-low, medium and high traffic.


  • English


  • Status: Active
  • Funding: $150000
  • Contract Numbers:


  • Sponsor Organizations:

    Wisconsin Department of Transportation

    4802 Sheboygan Avenue
    Madison, WI  United States  53707
  • Project Managers:

    Hefel, Steven

  • Performing Organizations:

    Auburn University

    National Center for Asphalt Technology
    310 Sanford Hall
    Auburn, Alabama  United States  36849-5131
  • Principal Investigators:

    West, Randy

  • Start Date: 20161108
  • Expected Completion Date: 20180808
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01638230
  • Record Type: Research project
  • Source Agency: Wisconsin Department of Transportation
  • Contract Numbers: 0092-16-06
  • Files: RiP, STATEDOT
  • Created Date: Jan 9 2017 1:53PM