在役乳化沥青冷再生混合料的疲劳性能

Fatigue Characteristics of Insitu Emulsified Asphalt Cold Recycled Mixtures

摘要:

通过应力控制下的劈裂疲劳试验，分析了现场服役多年的乳化沥青冷再生混合料及室内新成型的乳化沥青冷再生混合料劲度模量衰减特征以及2类混合料疲劳破坏阶段的黏弹性特征；结合损伤分析，提出了在役冷再生沥青混合料和新成型冷再生混合料疲劳破坏准则；对比了不同车道的在役冷再生混合料和新成型冷再生混合料的疲劳寿命，结果表明，现场实际轴载作用次数的增加会导致冷再生混合料剩余疲劳寿命的降低，冷再生混合料在使用中存在疲劳性能增长过程.

Abstract:

The splitting fatigue test was conducted on insitu emulsified asphalt cold recycled (EACR) mixture to inspect its attenuation characteristics of stiffness modulus as well as viscoelastic properties. The laboratory newprocessing EACR mixture was also tested for comparison. The failure criterions of two kinds of EACR mixtures were established based on fatigue testing results using damage mechanics theory. Moreover, Fatigue testing results indicate that more traffic loads will lead to more reduction in fatigue life of insitu EACR mixture and the fatigue life EACR mixture improves after being placed in service.