Effect of Asphalt/Cement Ratio on Fatigue Properties of Cement-Emulsified Asphalt Mortar

doi:10.16552/j.cnki.issn1001-1625.2025.0317

Abstract

Abstract: Cement-emulsified asphalt (CA) mortar, used as a cushion layer in ballastless track structures, is subject to fatigue damage under repeated wheel loading. In this study, the effects of stress ratio and asphalt/cement ratio on the fatigue life of CA mortar were investigated based on uniaxial compression test and fatigue test. The CA mortar fatigue life prediction equations incorporating stress ratios (0.6 to 0.8) and A/C (0.4 to 0.7) were constructed. The physical significance of equations was also elucidated, and finally the fatigue damage mechanism of CA mortar was revealed from a microscopic point of view. The results show that the growth rate of CA mortar compressive strength with age decreases as A/C increasing, asphalt gradually replaces cement hydration products as a continuous phase, and CA mortar properties approach those of asphalt mortar with enhanced toughness. The fatigue life of CA mortar gradually increases with increasing A/C under fatigue loading corresponding to the same stress ratio. The fatigue equation constructed with stress ratio and A/C as parameters can accurately predict the fatigue life of CA mortar with an average error of 6.9% between the predicting and actual values. The research results can provide a basis for predicting the fatigue life of CA mortar at a later stage.

Key words: cement-emulsified asphalt mortar, fatigue life, asphalt/cement ratio, stress ratio, microstructure, damage

CLC Number:

U214.9

JIN Shanshan, LI Xiang, ZHANG Yang, LIU Pengfei, WANG Zhihua, LI Liuhuan, ZHAO Yaodong. Effect of Asphalt/Cement Ratio on Fatigue Properties of Cement-Emulsified Asphalt Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3472-3482.

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