A Performance of Asphalts Modified with PPA (Polyphosphoric Acid)

Many highway agencies are concerned about the performance characteristics of polyphosphoric acid (PPA) modification and possible negative interactions with other mix components such as lime and liquid anti-strips. Such concerns also exist for emulsion-based warm mix asphalt (WMA) additive-modified asphalt binders containing PPA. Since PPA is a hydrophilic material and easily absorbs water, asphalt binders modified with higher percentages of PPA have a tendency to absorb water and lose strength, which is expected to result in increased moisture damage. The proposed study will investigate this issue and propose solutions through laboratory and field evaluations of PPA-modified asphalts. Conducting this research using commonly used asphalts in Arkansas will allow for the results to be calibrated for conditions prevailing in Arkansas. Currently Arkansas State Highway and Transportation Departments (AHTDs) Standard Specifications do not allow PPA as a asphalt modifier, however asphalt binder suppliers are believed to be including PPA in the asphalt.


    • English


    • Status: Completed
    • Funding: $216108
    • Contract Numbers:


    • Sponsor Organizations:

      Federal Highway Administration

      1200 New Jersey Avenue, SE
      Washington, DC  United States  20590
    • Project Managers:

      McKenney, Christopher

    • Performing Organizations:

      Arkansas State University, State University

      Department of Engineering, P.O. Drawer 1740
      State University, AR  United States  72467-1740

      Henderson State University

      Arkadelphia, AR  United States 
    • Principal Investigators:

      Hossain, Zahid

      Hardee, John

    • Start Date: 20141110
    • Expected Completion Date: 20160630
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01631178
    • Record Type: Research project
    • Source Agency: Arkansas Department of Transportation
    • Contract Numbers: TRC1501
    • Files: RiP, STATEDOT
    • Created Date: Mar 29 2017 5:37PM