Benchmarking Delta TC (∆Tc) for Wisconsin Materials

Details

• Creators:
  Bennert, Thomas A. ; Rowe, Geoffrey ; Ericson, Christopher ; Tulanowski, Jake
• Corporate Creators:
  Rutgers University. Center for Advanced Infrastructure and Transportation ; Wisconsin Highway Research Program
• Corporate Contributors:
  Wisconsin Department of Transportation. Research and Library Unit ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Asphalt Based Materials Best Practices Binders Delta Functions Delta Tc Evaluation Fatigue Cracking Glover-Rowe Parameter (GRP) IDEAL-CT Index Implementation Literature Reviews Procedures Rheology Specifications

  More +
• Publication/ Report Number:
  WHRP -0092-23-01
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report: October 2023 to May 2025
• Corporate Publisher:
  Wisconsin. Dept. of Transportation. Research and Library Unit
• Abstract:
  The purpose of the study was to evaluate the ΔTc parameter for potential inclusion in the WisDOT asphalt binder specifications for cracking potential. The research encompassed a literature review and extensive laboratory program consisting of both asphalt binder and mixture testing. Using the information and data collected, it was determined that ΔTc should not be selected as an asphalt binder cracking parameter due to variability issues, as well as its difficulty to properly rank polymer modified asphalt binder performance. Instead, the study provided two parameters that can be determined at a single test temperature and loading frequency; Glover-Rowe Parameter at 15C (GRP15C) and R-value at 15C. Criteria for the parameters were calibrated against an IDEAL-CT Index value of 30 after WisDOT long-term mixture aging. The parameters were found to be sensitive to asphalt binder supplier, different PG grades, inclusion of recycled asphalt binder and aging. Currently approved WisDOT asphalt binders were found to meet the requirements of the procedure after 20 hour PAV conditioning, but many had issues meeting the requirements after 40 hour PAV conditioning. When blended with typical RAP binder from Wisconsin, the test parameters would limit most asphalt binders to 35% asphalt binder replacement before failing the proposed criteria. Lastly, the criteria was compared to recovered asphalt binder from the WisDOT BMD Implementation test sections and could identify Test Section #4, which was the only section designed and produced to have an IDEAL-CT Index less than 30.
• Format:
  PDF
• Funding:
  WHRP 0092-23-01
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:420a692c79fd3af08d786ec8bbf47bdd96b04184e3fac79da5ad72f0bde57a10c281a6571cbc2a1c41dd775ffd1d4ed2a2282e9a0ae20670a2938a215457cd78
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/89216/dot_89216_DS1.pdf
• File Type:
  [PDF - 2.98 MB ]