Abstract:

At present, the indirect tensile method （splitting test） is commonly used in China to test the fatigue performanee of samples. However, there exist obvious differences between the loading mode of the method and the actual stress state of pavement, and the actual cracking mode is often inconsistent with the theoretical cracking location. In order to solve these problems, a four-point bending fatigue test system Cooper NU-14 was used to evaluate the fatigue performance of asphalt mixtures. The whole process of the test, including the experimental facility, the specimen fabrication, the experimental parameter setting and the loading, was described in detail, and the fatigue performances of the mixtures with different asphalt types and stone matrix asphalt were tested and quantitatively compared. The results show that the testing system effectively evaluates the fatigue performance of inhomogeneous asphalt mixtures, and that both the properties of the binder and the aggregate gradation significantly influence the fatigue performance of asphalt mixtures

Key words: asphah mixture, four-point bending, fatigue performance, Cooper NU-14