由于掺入道路DTC相变调温材料（DTC）后的相变沥青混合料可以调节材料的温度，使其在同样外界温度状况下，其极端高低温度比不掺DTC的同等材料有所减小，为了研究掺入DTC前后材料的性能变化，故针对基质沥青混合料与相变沥青混合料在相同外界温度下，即同一服役温度工况下表现出来的不同工作温度，研究其低温力学性能。为了获取同一服役工况下两种材料的温度差异，在以基质沥青混合料为基准的试验设计温度-10、-20与-30 ℃时，依据室外试验路段路面实际温度与室内车辙板在高低温交变箱中数据，分别测量了相变沥青混合料的温度，取二者平均作为相变沥青混合料对应试验温度，结果分别为-6.8、-16.5与-26.7 ℃。在此基础上进行两种混合料的小梁弯曲试验与半圆弯曲试验。试验结果表明，在相同温度时相变沥青混合料的低温性能均低于基质沥青混合料；在同一服役工况下，相变沥青混合料在低温时比基质沥青混合料的温度提高3~4 ℃，相变沥青混合料的低温性能优于基质沥青混合料，其均满足试验规范要求。

Asphalt mixtures with road phase change thermoregulation materials (DTC) can regulate the temperature of the material. The extreme high and low temperatures of DTC phase change asphalt mixtures are reduced compared to the equivalent material without DTC under the same external temperature conditions. In order to study the performance changes of the material before and after mixing DTC, the low-temperature mechanical properties of matrix asphalt mixtures (referred to as JZLH) and DTCLH were investigated with respect to their different operating temperatures exhibited under the same external temperature, i. e., the same service temperature operating condition. In order to obtain the temperature difference between the two materials under the same service condition, outdoor and indoor thermoregulation tests were conducted at the experimental design temperatures of -10, -20, and -30 ℃ based on JZLH. The test was based on the actual temperature of the pavement of the outdoor test section and the data of the indoor rutted plate in the high and low temperature alternating box, the temperature of the DTCLH was measured, and the average of the two was taken as the corresponding test temperature of the DTCLH, and the results are -6.8, -16.5 and -26.7 ℃, respectively. On this basis, the trabecular bending test and semicircular bending test of both mixes were carried out. The results show that the low temperature performance of DTCLH is lower than that of JZLH at the same temperature. Under the same service condition, the temperature of DTCLH is 3 ~ 4 ℃ higher than that of JZLH at low temperature, and the low-temperature performance of DTCLH is better than that of JZLH, and all of them meet the test specification requirements.