Evaluation of Low-Temperature Cracking (LTC) Performance Testing Methods to Assess Nebraska Asphalt Mixtures

Nebraska Department of Transportation (NDOT) has embarked on the development of balanced mix design (BMD) method with the two previous NDOT-funded research projects, Phase I (SPR-FY22 (002)) and Phase II (SPR-FY23(016) that considers 2 main distresses: rutting and mid-temperature cracking. Although the research outcomes show that the proposed BMD methods are practically efficient and implementable, they are limited and do not assess low temperature cracking resistance of asphalt mixtures, which is considered as one of the main concerns in cold climate states like Nebraska. Based on the NCHRP 20-07(406) report, there are three states (Iowa, Minnesota, and Missouri) in the mid-US regions that require a thermal cracking test in their mix design specifications [1]. The report further indicated that among state DOTs and asphalt contractors, the most commonly used thermal cracking tests were the Semi-Circular Bend Test (SCB), the Disc-Shaped Compact Tension Test (DCT), the Indirect Tensile (IDT) Creep Compliance and Strength Test, the Thermal Stress Restrained Specimen Test (TSRST), the Illinois Flexibility Index Test (I-FIT) and Bending Beam Rheometer (BBR) test (Figure 1).


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    • Status: Inactive
    • Funding: $152382
    • Sponsor Organizations:

      Nebraska Department of Transportation

      1500 Nebraska 2
      Lincoln, NE  United States  68502
    • Project Managers:

      Halsey, Lieska

    • Principal Investigators:

      Ho, Chun-Hsing

      teixeira, jamilla

    • Start Date: 20240701
    • Expected Completion Date: 20260531
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01920443
    • Record Type: Research project
    • Source Agency: Nebraska Department of Transportation
    • Files: RIP, STATEDOT
    • Created Date: Jun 3 2024 2:26PM