Statewide Implementation of the Surface Performance-Graded (SPG) Specification for Seal Coat Binders in Service

A Surface Performance-Graded (SPG) Specification for seal coat binders in service was developed and validated in Texas Department of Transportation (TxDOT) Research Projects 0-1710 and 0-6616 using binder properties measured in the laboratory and visual performance of 75 highway sections. The objective of this project is to implement the SPG specification statewide. Implementation will improve performance and extend the life of seal coats by providing an improved method for seal coat binder selection that accounts for differences in climate and directly relates to performance in terms of aggregate loss and bleeding over the critical first-year period. Seal coats make up approximately 40% of road surfaces statewide. This performance-related specification would replace the current TxDOT Seal Coat Material Selection Table (with the tier system) and conventional seal coat binder specifications for materials in service provided in TxDOT Item 300. TxDOT spends over $300 million on the contracted district-wide seal coat preventive maintenance program annually to treat approximately 8% of the state highway system. Implementation of this specification is expected to result in annual savings of $9 million by extending the life of 20% of the total seal coats by one year.


  • English


  • Status: Active
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

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

    Adams, Joe

  • Performing Organizations:

    Texas Transportation Institute

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

    Martin, Amy

  • Start Date: 20131008
  • Expected Completion Date: 20180831
  • Actual Completion Date: 0
  • Source Data: RiP Project 39982

Subject/Index Terms

Filing Info

  • Accession Number: 01569084
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 5-6616-01
  • Files: RiP, STATEDOT
  • Created Date: Jul 1 2015 2:45AM