Abstract
Cement emulsified bitumen mastic (simplified as CEBM) is a type of composite binder composed of cement, emulsified bitumen, water and various additives. Freeze–thaw cycles have an important influence on the fatigue properties of CEBM. In this paper, freeze–thaw test and fatigue test were carried out. Damage variable characterizing freeze–thaw effect and total damage variable characterizing freeze–thaw and fatigue coupling effect were established. They were based on the initial complex modulus and fatigue properties parameters of fatigue test. Effects of freeze–thaw cycles on fatigue properties and damage evolution process were analysed. This study demonstrates that, as freeze–thaw cycles increasing, fatigue life decreases, and the sensitivity of fatigue life with stress level is reduced. With the increase of freeze–thaw cycles, both freeze–thaw damage and total fatigue damage increase, and the proportion of freeze–thaw damage in total damage increases. Effect of freeze–thaw cycles on the fatigue properties of CEBM is enhanced. With the increase of bitumen content, freeze–thaw damage reduces and total damage increases. The increase of bitumen content can improve the frost resistance of CEBM and improve the sensitivity of fatigue properties to freeze–thaw cycles.
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