Evaluation of Enhanced-Friction Asphalt Overlays and Surface Treatments

This project will evaluate alternative asphalt-based solutions, both thicker asphalt mixtures and thinner asphalt-based surface treatments, that may provide similar frictional benefits to HFSTs, but with reduced cost and/or increased durability. Specifically, this project will explore potential high friction aggregate options that could be used in Florida and can be incorporated into asphalt mixtures and/or surface treatments. The project will explore and optimize the type(s) and amount of high friction aggregate(s) needed in existing Florida Department of Transportation (FDOT) friction courses (FC-4.75, FC-9.5, and FC-5) containing other aggregates commonly used in Florida for surface mixtures (south Florida limestone and Georgia granite) to significantly improve the frictional characteristics of these mixtures. Note 1: FC-4.75 has been used on occasion by FDOT. It is governed by a developmental specification located on the Department’s website. FC-4.75 can be placed thinner than traditional dense graded friction courses commonly used by the Department and may provide a more cost-effective option than FC-9.5. The project will also determine the most cost-effective measure for improving friction characteristics to multiple prescribed levels.


    • English


    • Status: Active
    • Funding: $240000
    • Contract Numbers:


    • Sponsor Organizations:

      Florida Department of Transportation

      Research Center
      605 Suwannee Street MS-30
      Tallahassee, FL  United States  32399-0450
    • Project Managers:

      Chami, Ahmad

    • Performing Organizations:

      Auburn University

      Department of Civil Engineering
      238 Harbert Engineering Center
      Auburn, AL  United States  36849
    • Principal Investigators:

      Moore, Nathan

    • Start Date: 20220422
    • Expected Completion Date: 20240630
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01895144
    • Record Type: Research project
    • Source Agency: Florida Department of Transportation
    • Contract Numbers: BED59
    • Files: RIP, STATEDOT
    • Created Date: Oct 3 2023 8:50AM