沥青混合料间接拉伸疲劳试验方法评述
Review of Indirect Tensile Fatigue Test Methods for Asphalt Mixtures

间接拉伸疲劳试验作为评价沥青混合料疲劳性能的方法之一，针对该试验方法应用中存在的试验结果不可比和出现与常规认识不符的问题，从力学原理、控制逻辑、加载模式等方面对间接拉伸疲劳试验方法进行了剖析，并对疲劳方程建立方法进行了对比分析，结果表明：使水平向传感器的测试值在100~400 με之间及间歇式加载是核心，保证了使试件处于线粘弹性范围，为保证测试结果的可比性和准确性，应遵循原测试方法的加载要求；初始应变同疲劳寿命的相关性较应力比和疲劳寿命相关性高。研究结论可为采用该方法准确评价混合料疲劳性能提供参考和借鉴。
Indirect tensile fatigue test is one of the methods to evaluate the fatigue properties of asphalt mixture. In view of the problems that the test results in the application of this test method are incomparable and inconsistent with the conventional understanding, the indirect tensile fatigue test method is analyzed from the aspects of mechanical principle, control logic, loading mode, etc., and the fatigue equation establishment methods are compared and analyzed. The results show that: The test value of the horizontal sensor is between 100 and 400 με and intermittent loading is the core to ensure that the specimen is in the linear viscoelastic range. In order to ensure the comparability and accuracy of the test results, the loading requirements of the original test method should be followed. The correlation between initial strain and fatigue life is higher than that between stress ratio and fatigue life. The research results can provide reference for the accurate evaluation of fatigue properties of mixtures by this method.