The Comparison of the Low-Temperature Performance Evaluation Methods of Asphalt Mixtures

There are many methods to evaluate the low temperature performance of asphalt mixture, but it is difficult for engineers to decide which kind of method can evaluate the low temperature performance of asphalt mixture accurately. In this paper, beam bending test (three points bending), thermal stress restrained specimen test (TSRST) and direct tensile relaxation test were adopted to evaluate two categories (AC and SMA), six kinds of asphalt mixtures low temperature performance. It can be concluded from test results that low temperature cracking resistances performance of asphalt mixture evaluated by the index of bending strength is not consistent with the failure strain obtained from beam bending test, it is because the low temperature performance of asphalt mixture determined by many factors, not only determined by strength characteristics or deformation capacity. By the same token, relaxation time obtained from direct tensile relaxation test cannot be used to evaluate the low temperature performance of asphalt mixture. The curve of strain versus stress can be obtained through the beam bending test of asphalt mixture. The area below the strain C stress curve is the bending strain energy density of asphalt mixture. The greater bending the strain energy density, the better low temperature performance. From the regression analysis it can be found that there is a good correlation between the bending strain energy density and fracture temperature. This correlation shows that the critical values of bending strain energy density can be used to determine the low temperature performance of asphalt mixture in the absence of fracture temperature.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK50 Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Yiqiu, Tan
  • Zhang, Lei
  • Lun, Ji
  • Shan, Liyan
• Conference:
  • Transportation Research Board 91st Annual Meeting
  • Location: Washington DC, United States
  • Date: 2012-1-22 to 2012-1-26
• Date: 2012

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 12p
• Monograph Title: TRB 91st Annual Meeting Compendium of Papers DVD

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Bending; Cracking; Low temperature; Mechanical relaxation; Regression analysis
• Uncontrolled Terms: Strain energy density; Thermal stress restrained specimen test
• Subject Areas: Highways; Materials; I30: Materials;

Filing Info

• Accession Number: 01373214
• Record Type: Publication
• Report/Paper Numbers: 12-1042
• Files: TRIS, TRB
• Created Date: Jun 21 2012 2:05PM