Use of Tamper Bar Paver to Place Thick Lift Asphalt Concrete Pavement (ACP)

Asphalt concrete placement specifications have maximum allowable lift thicknesses to ensure adequate mixture compaction. When the design thickness exceeds this limit, placement must be phased in multiple lifts, creating other problems: - Increased construction time, traffic exposure, and traffic disruption; - Potentially worse performance from poor stiffness/bonding at the lift interface. In 2018, an Atlanta District contractor experimented with a tamper bar paver for single-lift placement of Superpave Type C at four (4) to six (6) inches thick. Both the top and bottom of the lift had acceptable air void contents. Further study of tamper bar pavers for thick-lift construction is warranted. The research team will: 1) Review the literature for performance of tamper bar pavers in thick-lift placement and recommended maximum lift-thicknesses. 2) Develop a field-based testing plan that considers different construction scenarios, paver types, number of lifts, total thickness, tamper bar settings, and roller patterns. 3) Construct test sections and evaluate in-place air voids with traditional methods and innovative methods like full-coverage Ground Penetrating Radar (GPR) based density testing and Computed Tomography (CT) X-ray scanning. Also evaluate pavement profile roughness, and stiffness and cracking performance of cores. 4) Statistically analyze the data. 5) Develop guidelines for the use of tamper bar pavers, highlighting best practices and limitations.

Language

  • English

Project

  • Status: Active
  • Funding: $301657
  • Contract Numbers:

    0-7064

  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Texas Department of Transportation

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

    Schwerdt, Tom

  • Performing Organizations:

    Texas Transportation Institute

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

    Wilson, Bryan

  • Start Date: 20191206
  • Expected Completion Date: 20220122
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01744094
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7064
  • Files: RiP, STATEDOT
  • Created Date: Jun 25 2020 3:26PM