Abstract
Semi-flexible composite mixture as a new type of pavement materials has been widely adopted in pavement engineering, owing to the advantages in improved rutting resistance, water stability, and mechanical property. However, only one type of fatigue equation using exponential framework based on the stress (or strain) is employed to predict the fatigue life of the semi-flexible composite mixture in existing studies. Considering the importance of the fatigue equation during pavement design, it is necessary to seek an alternative approach to enrich the fatigue prediction equation of semi-flexible composite mixture. Hence, fatigue characteristics of the semi-flexible composite mixture are analyzed in the case of different stress levels and curing times in this study. The damage evolution during the fatigue tests is investigated based on the permanent deformation ratio. Finally, a new framework of fatigue equation via damage stationary value (DSV) is established to predict the fatigue life of the semi-flexible composite mixture. The proposed fatigue equation provides a better prediction effect.
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