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.

• Record URL:
  • https://oitco.hylandcloud.com/cdotrmpop/docpop/docpop.aspx?docid=19502274
• 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

• TRT Terms: Correlation analysis; Cracking; Fracture properties; Hot mix asphalt; Laboratory tests; Low temperature; Performance; Properties of materials; Rheometers; Stiffness; Thermal degradation; Thermal stresses
• Uncontrolled Terms: Field performance
• Old TRIS Terms: Correlations; Test results; Thermal-stress restrained-specimen test
• Subject Areas: Data and Information Technology; Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

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