Research on viscoelastic-plastic damage characteristics of cement asphalt composite binder

In order to study the viscoelastic-plastic damage of cement asphalt composite binder (simplified as CACB) and the relationship between plastic damage and viscoelastic damage, a viscoelastic-plastic constitutive model (VE-P model) was constructed, and the viscoelastic-plastic damage process of CACB was analyzed. Effects of material composition and microstructure on viscoelastic-plastic damage were studied. During creep test, with the increase of stress ratio, the proportion of plastic strain and unrecoverable strain increases, and the ability of CACB to resist deformation and deformation recovery decreases. Stress ratio has different effects on elastic damage, viscous damage, delayed elastic damage and plastic damage. Temperature has little effect on elastic damage and delayed elastic damage, but has a greater effect on plastic damage. With the increase of initial plastic damage, the damage of elasticity, viscosity and delayed elasticity intensified. When A/C = 0.8, CACB can form a more reasonable microstructure, the mechanical properties of CACB are least affected by damage, and its mechanical properties are more stable. The research results in this paper provide a theoretical basis for CACB's material design and performance evaluation. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

A viscoelastic-plastic constitutive model was constructed to study the viscoelastic-plastic damage of CACB, analyzing the effects of material composition and microstructure on the damage process. It was found that stress ratio and temperature have significant effects on plastic damage, while CACB with A/C = 0.8 exhibits more stable mechanical properties.