Abstract: The low-temperature anti-cracking performance of Superpave asphalt mixture is evaluated respectively by low temperature curvature rupture test and thermal stress restrained specimen test (TSRST).The results show that freezing temperature and transition point temperature are the indexes to evaluate the low temperature performance of superpave asphalt mixture.It is also found that the curvature strain energy density used as an evaluation index indicates well the low temperature performance of Superpave asphalt mixture;meanwhile, the test result can accord with the result got by TSRST.

Key words: Superpave asphalt mixture, low-temperature anti-cracking performance, thermal stress restrained specimen test (TSRST), low temperature curvature rupture test, bending strain energy density

摘要： 采用低温弯曲破坏试验和约束试件温度应力试验,评价了Superpave沥青混合料的低温抗裂性,并对两种试 验方法及其评价指标进行对比分析。研究结果表明:约束试件温度应力试验中的冻断温度和转折点温度可以较好 的评价Superpave沥青混合料的低温抗裂性;弯曲破坏试验中用弯曲应变能密度作为评价指标可以很好表征Superpave 沥青混合料的低温性能,并且与约束试件温度应力试验结果基本吻合。

关键词: Superpave沥青混合料, 低温抗裂性, 约束试件温度应力试验, 低温弯曲破坏试验, 弯曲应变能密度