Abstract
Cement asphalt composite binder (simplified as CACB) is a type of composite cementitious material formed by cement, emulsified asphalt and various admixtures. It is mainly used in the ballastless slab track structure of high-speed railway at present. Freeze-thaw cycles can cause damage of CACB mechanical properties and affect the mechanical properties of high-speed railway ballastless slab track. In order to study effects of freeze-thaw cycles on mechanical properties of CACB and evolution process of freeze-thaw damage, creep and creep recovery tests were carried out after freeze-thaw test. Basing on Revised Kelvin Burgers (simplified as RKB) viscoelastic mechanical model, creep compliance and creep recovery compliance equation were deduced. Damage variables which represent elastic damage, viscous damage and viscoelastic damage of CACB under freeze-thaw cycles were established. Deformation resistance and deformation recovery ability of CACB were weakened by freeze-thaw cycles and the hysteresis of mechanical response increased. With the increase of freeze-thaw cycles, CACB presents a tendency of softening, and the viscoelastic damage stages of CACB are divided into synchronous damage stage and differential damage stage. The material ratio of CACB and microstructure of hardening system have important influence on the evolution of viscoelastic damage and damage difference.
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