沥青混合料蠕变劲度模量的静态和动态响应

Static and Dynamic Response of Creep Stiffness Modulus of Asphalt Mixtures

摘要:

采用静态和动态蠕变试验研究了沥青混合料在级配、油石比、温度和加载等条件变化时蠕变劲度模量的静、动态响应.所用级配为AC13和AC25,并用正交试验确定出最佳级配和油石比.结果表明,级配的微小变化就能显著影响沥青混合料静、动态蠕变劲度模量;在最佳油石比上增减0.15%时其影响不明显,但变化幅度较大时则影响增大;试验温度升高将迅速降低静、动态蠕变劲度模量;随加载水平增加,静态蠕变劲度模量降低但动态蠕变劲度模量增加.此外,在相同加载水平下,静、动态蠕变劲度模量相关关系较好.

Abstract:

Using static and dynamic creep test the static and dynamic responses of creep stiffness modulus of asphalt mixtures for AC13 and AC25 with different gradations and asphalt-aggregate ratios determined by orthogonal test design,temperatures and loading levels were researched.The results show that influence of slight change of the gradations on the static and dynamic creep stiffness modulus of asphalt mixtures is significant. Whereas for the optimum asphalt-aggregate ratios when it is only a plus or minus 0.15%,little influence appears unless a severe departure from the optimum asphalt-aggregate ratios takes place.And increase of test temperatures results in a rapid decrease of the static and dynamic creep stiffness modulus of asphalt mixtures.However,the static creep stiffness modulus decreases but the dynamic creep stiffness modulus increases with rise of loading levels.Besides,the results also indicate that relationship between the static and dynamic creep stiffness modulus is well correlated under the same loading level.