Develop Recommendations for Evaluating Surface Types and Aggregate Properties to Minimize Wet Weather Crashes

The current design methodology for asphalt and seal coat surfaces is limited when considering safety aspects like friction and surface texture, also known as skid resistance. The only requirement for asphalt or seal coats placed on high demand areas is that they use surface aggregate classification (SAC) A coarse aggregates. This approach has several shortcomings: does not consider the friction and texture of the final surface; does not consider the change in skid resistance versus trafficking; SAC system is defined by the acid insolubility test, not a direct measurement of aggregate properties that mechanically generate skid resistance; and SAC categories are very broad with no distinction of the best and worst performing aggregates in each class. Consequently, some recent resurfacing projects have resulted in unacceptable skid resistance shortly after construction, even when SAC A aggregates were used. As such, there is a serious need to improve the current design process for asphalt and seal coat to ensure that the surfaces will have acceptable long-term skid resistance. The research team will develop a laboratory-based system to select the pavement surface type and coarse aggregate types that will provide adequate skid resistance over the life of the pavement surface.


  • English


  • Status: Active
  • Funding: $599992
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Managing Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Odell, Wade

  • Performing Organizations:

    Texas A&M Transportation Institute

    Texas A&M University System
    3135 TAMU
    College Station, TX  United States  77843-3135

    The University of Texas at Tyler

    3900 University Blvd
    Tyler, TX  United States  75799
  • Principal Investigators:

    Wilson, Bryan

  • Start Date: 20221110
  • Expected Completion Date: 20260228
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01894859
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7151
  • Files: RIP, STATEDOT
  • Created Date: Sep 27 2023 5:11PM