Scaling Up and Finalizing Ozone Ageing for Hot Mix Asphalt (HMA)

Evaluating the cracking resistance of asphalt mixtures after long-term aging is essential to ensure its long-term performance. NCHRP project 9-54 recommended aging loose asphalt mixtures at 95C for a period of 4 to 8 days (depending on the location in Texas) to simulate 4 years of field aging at 6 mm below the pavement surface. Subsequently, Texas Department of Transportation (TxDOT) Project 0-7061 examined ways to reduce the time required for long-term aging without increasing the aging temperature to beyond 100C to avoid aging artifacts. Project 0-7061 concluded that 5 days of long-term aging at 95C could be reduced to approximately 2 days by increasing the pressure or approximately 1 day by exposing the mix to ozone. This research project will: (1) develop a scalable prototype ozone aging oven that can used for routine implementation by mixture labs throughout the state, (2) optimize and standardize the ozone concentration to ensure repeatability and sensitivity, (3) provide a standard test method, training, and ozone aging equipment to TxDOT, and (4) conduct round robin testing to establish confidence with the test method and make any refinements to the standard test method if necessary.

Language

  • English

Project

  • Status: Active
  • Funding: $554,754.00
  • Contract Numbers:

    0-7061-01

  • Sponsor Organizations:

    Texas Department of Transportation

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

    Schwerdt, Tom

  • Performing Organizations:

    Center for Transportation Research

    3925 W. Braker Lane
    Austin, TX  United States  78759
  • Principal Investigators:

    Bhasin, Amit

  • Start Date: 20250122
  • Expected Completion Date: 20271231
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01944830
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7061-01
  • Files: RIP, STATEDOT
  • Created Date: Feb 4 2025 10:05AM