INVESTIGATION OF LOW TEMPERATURE THERMAL CRACKING IN HOT MIX ASPHALT. FINAL REPORT

A study was performed to determine the influence of material properties on the thermal cracking performance of hot mix asphalt (HMA), and to determine the ability to predict thermal cracking from pavements of known field performance. The testing device used to measure the HMA properties was the thermal-stress, restrained-specimen test (TSRST), and the device used to measure the binder properties was the bending beam rheometer (BBR). The laboratory study was conducted to determine the variability of test results as an influence of 1) asphalt cement stiffness, 2) asphalt cement quantity, 3) mixes with various aggregate qualities, 4) aging, and 5) the presence of hydrated lime. The influence of the asphalt cement stiffness was the single largest factor that controlled the test results. The field study was performed with 9 sites of known thermal cracking performance. Correlation of the test results to the known field performance was not very good. The best correlation was with the fracture strength measured by the TSRST and the m-value from the BBR. For samples prepared and aged in the laboratory, the BBR results on the binder gave approximately 2 deg C warmer temperatures than the TSRST results on the mix. For field samples, the BBR results on the binder gave approximately 2 deg C cooler temperatures than the TSRST results on the mix.

  • Corporate Authors:

    Colorado Department of Transportation

    4201 E Arkansas Avenue
    Denver, CO  United States  80222

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Aschenbrener, T
  • Publication Date: 1995-2

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 53 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00676453
  • Record Type: Publication
  • Report/Paper Numbers: CDOT-DTD-R-95-7
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 31 1995 12:00AM