基于劈裂蠕变的沥青混合料疲劳寿命预测

Fatigue Life Prediction of Asphalt Mixture Based on Splitting Creep Test

沥青路面的疲劳破坏是路面工程中最为常见的病害之一,而疲劳性能一直是沥青路面结构设计的重要技术参数指标之一.通过静载劈裂试验对沥青混合料的疲劳性能进行了研究,通过回归分析建立了劈裂蠕变破坏时间与劈裂疲劳破坏时间的对应关系.研究结果表明劈裂蠕变试验与劈裂疲劳试验具有很好的相关性,可以通过转换系数K将劈裂蠕变破坏时间转换为劈裂疲劳破坏时间,从而得到沥青混合料的疲劳寿命.

Fatigue failure is one of the major distresses in asphalt pavements, and the fatigue performance is always an important technical parameter of asphalt pavement structure design. The fatigue performance of asphalt mixtures were researched by the static splitting test and the relationship between creep damage time and fatigue damage time was established by a regression analysis. It is indicated that there is a good relativity between creep damage time and fatigue damage time, and the creep damage time could be transformed into the fatigue damage time by the translating coefficient K. And then, the fatigue life of asphalt mixture could be predicted.