摘要
疲劳破坏是沥青路面重要的破坏类型,而沥青是影响路面沥青混合料疲劳性能的关键因素。沥青疲劳评价指标尚未有统一的标准,为对沥青的疲劳破坏判定提供指标参考。借助DSR进行了不同控制模式和荷载水平下沥青的疲劳试验,并对不同的沥青疲劳评价指标进行了评价和对比分析。研究表明:Np20对应于微裂纹的形成,不适用于作为沥青的疲劳破坏标准;Nf对应于宏观裂缝的形成,适合作为沥青疲劳破坏的评价指标;N50%G*与Nf相关性较高,可以作为一个简单且合理的沥青疲劳评价指标。
Fatigue damage is an important damage type of asphalt pavement, and asphalt is the key factor influenc-ing the pavement fatigue performance of asphalt mixture. In order to provide reference for the fatigue failure of as-phalt, with the help of DSR, the fatigue test of asphalt is conducted under different control modes and load levels, and different asphalt fatigue evaluation criteria are evaluated and compared. The results show that Np20 corre-sponds to the formation of micocrack, unsuitable for the fatigue failure criterion of asphalt, while Nf corresponds to the formation of macrocrack, which is suitable for the fatigue failure criterion of asphalt and N50%G＊is found to have a strong correlation with Nf, which can be used as a simple but reasonable fatigue criterion.
出处
《华东交通大学学报》
2014年第2期14-19,共6页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(51168044)
关键词
沥青
疲劳破坏发展过程
疲劳评价指标
控制模式
耗散能
asphalt
development process of fatigue failure
fatigue evaluation criterion
control mode
dissipated energy
