Effect of aging on fatigue performance of cement emulsified asphalt repair material

Abstract

Cement emulsified asphalt repair material (simplified as CEA repair material) is a composite material formed by hardening of cement and cementation of emulsified asphalt. The aging performance and fatigue performance of CEA repair material will affect the repair effect of cracks. In this paper, the effect of aging on fatigue performance of CEA repair material was studied through the fatigue tests after aging. The fatigue equation and the fatigue damage evolution equation considering the aging effect were established. The effects of aging time, stress ratio and material ratio on the fatigue performance of CEA repair material were analyzed. As the aging time increases, the fatigue life of CEA repair material decreases, and the sensitivity of fatigue life to the change of stress ratio decreases. The increase of cement content can reduce the aging degree of asphalt and slow down the aging speed of asphalt. The increase of cement content can also improve the stability of fatigue performance of CEA repair material. The effect of stress ratio on fatigue life is related to aging time and material ratio. As the aging time increases, the phase angle decreases and the energy dissipation decreases. Increasing the amount of cement can improve the stability of fatigue performance of CEA repair material, but it reduces the fatigue life of CEA repair material. The material design of CEA repair material should comprehensively consider the aging resistance and fatigue performance, and rationally determine the amount of cement and emulsified asphalt.