基于粘弹性连续损伤理论的沥青混合料疲劳损伤性能分析

Study on Fatigue Damage Performance of Asphalt Mixture Based on Viscoelastic Continuous Damage Theory

为研究粘弹性连续损伤理论用于表征沥青混合料的疲劳性能及其对混合料抗疲劳性的影响,通过改性聚合物和纳米黏土改性沥青使用线性幅度扫描,对混合料以不同的加载速率进行4点弯曲梁疲劳试验,采用400、600、800、1000微应变,结合粘弹性连续损伤力学(VECD)概念,建立沥青混合料疲劳寿命模型.结果表明:沥青的完整性与粘弹性参数之间存在很强的相关性且与沥青混合料的抗疲劳性有较好的相关,同时沥青的LAS测试结果可与VECD疲劳模型结合使用估测HMA混合物的疲劳寿命.

In order to study the viscoelastic continuous damage theory used to characterize the fatigue performance of asphalt mixtures and their effects on the fatigue resistance of the mixtures,the mixture was changed by linear amplitude scanning through modified polymer and nano-clay modified asphalt.The four-point bending beam fatigue test was carried out at a loading rate of,using 400 microstrain,600 microstrain,800 microstrain and 1000 microstrain,combined with the concept of viscoelastic continuous damage mechanics(VECD),to establish the fatigue life model of asphalt mixture.The results show that there is a strong correlation between the integrity of the asphalt and the viscoelastic parameters and a good correlation with the fatigue resistance of the asphalt mixture.At the same time,the LAS test results of the asphalt can be used in conjunction with the VECD fatigue model to estimate the HMA Fatigue life of the mixture.