The hysteresis curve of dynamic resilient modulus (DRM) is the load and deformation curve of asphalt mixture under dynamic loading, it can reflect the evolution rule of internal stress-train state with load and temperature. Based on viscoelastic theory, 3 morphological parameters could be determined: slope k of major axis, eccentricity e of ellipse, and area S of HC, which characterizes DRM, viscosity and energy dissipation capacity of asphalt mixture respectively. Thus the DRM test under various temperatures and loads are carried out. The result shows that there is a significant difference in the morphological parameters of SBS and asphalt mixture No.70 with the increase of temperature, and a inflection point exists at 15~20℃ in both hysteresis curves, the values of k and S change regularly but e keeps unchanged as load level increases. It indicates that (1) asphalt quality has more influence on the property than grade, and the viscosity is unrelated to load size; (2) between 15~20℃, the mechanical properties of asphalt mixture vary greatly, and their sensitivity to temperature are higher; (3) different values of morphological parameters of HC reflect the performance difference of asphalt mixture, and 3 morphological parameters could be used to evaluate the basic mechanical performance of asphalt mixture include viscosity, fatigue durability, etc. Finally, based on the changing rule of test curves, the stress dependence model of resilience modulus which reflects the response behaviors of asphalt mixture under various stress level conditions is established, and the prediction results are close to the real state. The variable load cumulative dissipation energy prediction equation is derived based on the Miner linear damage criterion, and the fatigue equation based on the theory of energy dissipation is established. The morphological parameters S obtained by the dynamic modulus test can be used to predict the fatigue performance of asphalt mixture.

To study the effect law of asphalt mixture composition design and static/dynamic test methods on resilient modulus, and consummate the design parameters of asphalt mixture, the laboratory tests on static/dynamic compression resilient moduli and strength are conducted by the uniaxial unconfined method and top measuring method by MTS-810. The result shows that (1) there is no direct relationship between strength and resilient modulus of asphalt mixture; (2) both the aggregate gradation and asphalt quality can influence the value of resilient modulus, and the influence from asphalt quality is more significant. By studying the deformation law of the material under static and dynamic loading throughout the test, and combining with the Kelvin mechanic model and viscoelastic theory of asphalt mixture, the limitations of the static and dynamic moduli are demonstrated. It shows that the viscoelastic property is the important factor affecting the values of static and dynamic moduli of the mixture, and resulting in smaller values of moduli. In the end, the linear relationship between static and dynamic moduli is researched, and the conversation equation of static and dynamic moduli for different nominal maximum aggregate sized mixture is obtained, which is more accurate compared to the existing formula.