Incorporating Lab Skid Measurements into the Balanced Mix Design Process

Texas Department of Transportation (TxDOT) research developed the Balanced Mix Design (BMD) concept around 2005 where the conflicting mix properties of rutting and cracking are measured using laboratory tests and a binder type and content selected which provides satisfactory results for both requirements. The next and final stage of the BMD development is to incorporate a defensible and practical laboratory assessment of skid resistance into the process. TxDOT has been conducting research on predicting skid resistance for over 5 decades. This research has focused on measuring the polishing resistance of the coarse aggregate portion of mixes. This has led to the development of a surface aggregate classification where the SAC A materials are rated as having good skid resistance properties. However recently it is reported that some mixes with predominantly SAC A materials have low skid resistance. In addition some of the fine surface mix with little coarse aggregate have been shown to have excellent skid resistance. One conclusion is that the long-term skid resistance of any surface mix is a function of many factors including mix, type, gradation, the quality of the fines used, and others not simply coarse aggregate properties. It is proposed that a laboratory test procedure needs to be developed and implemented to measure skid resistance of the proposed mix. This test will eventually be incorporated into TxDOT's BMD.

Language

  • English

Project

  • Status: Active
  • Funding: $688699
  • Contract Numbers:

    0-7212

  • Sponsor Organizations:

    Texas Department of Transportation

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

    Dassi, Martin

  • 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:

    Goehl, Darlene

  • Start Date: 20241018
  • Expected Completion Date: 20270831
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01935542
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7212
  • Files: RIP, STATEDOT
  • Created Date: Oct 30 2024 3:02PM