2273 - Development of Guidelines for Selection and Evaluation of Tack Coats in Oklahoma

Flexible pavements are typically constructed by compacting asphalt mixes in multiple layers. It is important that the pavement structure behave as one system, rather than multiple independent layers. Inadequate interlayer bond leads to distresses such as half-moon-shaped cracks, delamination (debonding), followed by longitudinal wheel path cracking, potholes, fatigue cracks, slippage, and rutting. The quality and integrity of the bond between the asphalt layers, especially the bond between the existing road surface and an overlay is crucial to pavement performance and durability. In order to improve the interlayer bonding of asphalt pavements, tack coat is used frequently. Tack coat involves application of a thin layer of liquid asphalt to promote bonding between the existing pavement and the new layer or between two lifts and provide a waterproofing barrier. This study will aid the Oklahoma Department of Transportation (ODOT) in improving its current practice of selection of tack coat type and application rate. The results from this study will be used to develop recommendations and development of quality control measures for tack coats for enhanced performance. Such measures will benefit ODOT by reducing pavement maintenance costs by minimizing tack coat-related failures of pavements.

    Language

    • English

    Project

    • Status: Active
    • Funding: $84232
    • Contract Numbers:

      SPR 2273

      SPRY-0010(69)RS

    • Sponsor Organizations:

      Oklahoma Department of Transportation

      200 NE 21st Street
      Oklahoma City, OK  United States  73105
    • Project Managers:

      Stephens, Teresa

    • Performing Organizations:

      University of Oklahoma, Norman

      School of Civil Engineering and Environmental Science
      202 West Boyd Street, Room 334
      Norman, OK  United States  73019
    • Principal Investigators:

      Zaman, Musharraf

    • Start Date: 20161001
    • Expected Completion Date: 20171230
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01578487
    • Record Type: Research project
    • Source Agency: Oklahoma Department of Transportation
    • Contract Numbers: SPR 2273, SPRY-0010(69)RS
    • Files: RiP, STATEDOT
    • Created Date: Oct 22 2015 2:01PM