However,through studying the development of correlation of DS with the static creep stiffness modulus,the DS and static creep stiffness module are tried to be design parameters of the asphalt pavement structures.

However,it can be transformed into rutting modulus(E_(DS)) to find the relationship between dynamic creep stiffness modulus(S_(dy)) and DS.

By using Levenberg-Marqurdt and the global optimization theory,the static load creep tests to asphalt mixture under 40℃,200kPa and 40℃,50kPa are analyzed,and one kind of optimized asphalt mixture creep constitutive model is proposed,it overcomes the shortcoming that the commonly used model precision is not high and the model description extensibility is not good.

The analysis of the static load creep tests to asphalt mixture under 40 ℃,200 kPa and 40 ℃,50 kPa,indicated that the traditional machine model of asphalt mixture can not decribe the "consolidation effect"and "flow damage"at the same time.

In this paper,the method calculating the critical cracking temperature is analyzed, which comprises the fitting model to stiffness modulus master curve of asphalt, and the effects of cooling rate and contraction coefficient on the result of the critical cracking temperature.

Based on the nomograph by van der Poel, this paper deduces a general formulation with Penetration Index, PI, and the temperature difference between actual value and Softening Point (R&B), ΔT, as variables for the stiffness modulus of asphalt binders using routine test data, through regression analyses.

The linear relationship between the stiffness modulus and the temperature changes of the road was established according to the conventional mathematical formula of the stiffness modulus of asphalt and asphalt mixture.