Update Seal Coat Application Rate Design Method

A successful seal coat is one that provides over the design life, adequate surface texture and seals the pavement structure from water intrusion. There are design methods for seal coat application rates, however these design methods have been around since the 1960's and have not been updated. TxDOT typically uses experience to determine seal coat application rates. Unfortunately [due to rare use] the experience level is variable and loss of experienced personnel can lead to increased problems until experience is gained. Some of these problems are flushing, bleeding and rock loss. There are problems with underseals as well as surface seals. Poor underseals can lead to base failures and cause hot mix rutting. Contractors have also lost experience and in general will have less experienced personnel on small quantity seal coat projects. The disconnect from how the plan rates are established and the actual construction application rates can cause disputes on projects. An established design method can remove risk and result in better performing seal coat projects. Project objectives include evaluating current seal coat application rate design methods used by TxDOT district and evaluating materials used in seal coat and their influence on application rates. Researchers will propose a new design procedure or modified existing procedure. Better design methods will result in fewer problems and the the seal coat will be successful over its service life.


  • English


  • Status: Active
  • Funding: $125000
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

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

    Jensen, Darrin

  • Performing Organizations:

    Texas A&M Transportation Institute, College Station

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

    Goehl, Darlene

  • Start Date: 20180901
  • Expected Completion Date: 20210831
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01690718
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6989
  • Files: RiP, STATEDOT
  • Created Date: Jan 9 2019 6:55PM