Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt

Details

• Creators:
  Aschenbrener, Timothy B.
• Corporate Creators:
  Colorado. Department of Transportation
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Thermal degradation
  • Field tests
  • Stiffness
  • Thermal stresses
  • Low temperature
  • Correlation analysis
  • Cracking
  • Fracture properties
  • Hot mix asphalt
  • Laboratory tests
  More +
• Publication/ Report Number:
  CDOT-DTD-R-95-7
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Corporate Publisher:
  Colorado. Department of Transportation
• Description:
  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.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/93735/dot_93735_DS1.pdf
• File Type:
  [PDF - 2.95 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c25d2e01eb89d455f1c5226f4ede0180dc97fec030b6f58fdbd50eaddb4b6ed2c2c889fce2f7c487df989910b2ffb5a917fc435731212867f7afbd36dcd6c0ca