本文件规定了表征沥青混合料抗低温开裂性能的单轴拉伸试验。单轴拉伸试验的结果可用于评估以下各项:-规定温度下的拉伸强度，采用单轴拉伸应力试验（UTST）；-采用热应力约束试件试验（TSRST），确定沥青在破坏前能抵抗的最低温度；-规定温度下的抗拉强度储备（使用TSRST和UTST的组合）；-松弛时间，采用松弛试验（RT）；-用拉伸蠕变试验（TCT）反算流变参数的蠕变曲线；-使用单轴循环拉伸应力试验（UCTST），在低温和机械荷载组合下的低温疲劳抗力。

This document specifies uniaxial tension tests for characterizing the resistance of an asphalt mixture against low temperature cracking. The results of the uniaxial tension tests can be used to evaluate the following: - tensile strength at a specified temperature, using the uniaxial tension stress test (UTST); - minimum temperature that the asphalt can resist before failure, using the thermal stress restrained specimen test (TSRST); - tensile strength reserve at a specified temperature (using a combination of TSRST and UTST); - relaxation time, using the relaxation test (RT); - creep curve to back calculate rheological parameters, using the tensile creep tests (TCT); - fatigue resistance at low temperatures due to the combination of cryogenic and mechanical loads, using the uniaxial cyclic tension stress tests (UCTST).