摘要
为了研究长期服役条件下沥青混合料的疲劳性能变化情况,在对3种路面结构不同病害位置处获得的心样施加不同应力比大小的荷载作用下进行了间接拉伸疲劳实验.结果表明,合理的罩面养护能够降低沥青面层抗疲劳性能的衰减速度;直接与外部环境接触的面层抵抗小应力水平荷载的能力增加,而承受大应力水平荷载时的抗疲劳能力则显著下降;在长时间外部环境作用和行车荷载作用下,上面层沥青混合料试件对应力加载水平极为敏感,通过沥青面层材料疲劳曲线的斜率,可以很好地预测沥青路面残留疲劳特性.
In order to study the changes in fatigue performance of long‐term serviced asphalt mixture . This paper investigated the fatigue properties of asphalt specimens in different stress ratio conditions by Universal Testing Machine .The specimens were cored in the region of multiple types of diseases from the field which have three types of structures .The study showed that the decay rate of anti‐fa‐tigue performance could slow dow n by reasonable overlays .T he anti‐fatigue properties of surface layer which connected with environment directly possessed better performance in low level stress loading , and worse in high level stress loading .Due to the long‐term exposing to environment and the action of vehicle load ,asphalt mixture specimen in upper layer became extremely sensitive to the level of load stress .It is also indicated that the slope of asphalt mixture fatigue curve could be used to forecast the retained fatigue life of asphalt road .
出处
《武汉理工大学学报（交通科学与工程版）》
2015年第5期1083-1086,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家重大科学仪器设备开发专项资助(批准号:2013YQ160501)
关键词
服役
面层
心样
疲劳性能
service
layer
cored specimen
fatigue performance
