2024 Volume 80 Issue 21 Article ID: 24-21004
In cold regions, low-temperature cracking of asphalt pavements brings rainwater intrusion, that causes deterioration from surface to base course due to repeated freezing and thawing as well as loading. In this study, we analyzed the mechanism by which low-temperature cracks occur, clarified the performance required for asphalt mixtures that prevent low-temperature cracks, and developed an evaluation method. The required performance index consists to the two aspects according to short-term performance and long-term performance. The former (short-term performance) is the tensile strain corresponding to the maximum daily temperature change measured in winter. The latter (long-term performance) is the accumulated strain when temperature stress acts for a long period of time.
A static tensile test was used to evaluate the former, and a newly developed testing system capable of conducting three types of tests, a temperature stress test under complete restraint, a creep test, and a static tensile test, was used to evaluate the latter. The new asphalt mixture developed for anti-low-temperature cracking met the required performance
