冻融对CACB材料粘弹性力学行为的影响

The viscoelastic mechanical behavior of cement asphalt composite binder (CACB) under the influence of freeze-thaw cycles was studied through the freeze-thaw and creep tests. A viscoelastic mechanical model of four elements and five parameters was established, and the constitutive equation of CACB was set up on the basis of the fitting analysis of creep test results. The change in constitutive model parameters with freeze-thaw cycles were studied to analyze the laws underlying the influence of freeze-thaw cycles on the viscoelastic mechanical behavior of CACB. This study demonstrated that freeze-thaw cycles weakened the resistance of CACB to instant elastic deformation and shear flow deformation and dramatically influenced the elastic properties of CACB. The change in viscoelastic constitutive model parameters can be used to characterize the general mechanical properties of CACB with freeze-thaw damage. Although freeze-thaw cycles did not change the viscoelasticity of CACB, CACB exhibited viscous-material-like mechanical properties, reduced load resistance, and increased deformability as asphalt content and temperature increased.