不同类型沥青混合料抗裂性能的对比分析

Comparative Analysis on the Fracture Resistance of Different Types of Asphalt Mixture

分别使用弹性破坏理论的弯曲应变密度临界值、弹塑性断裂力学理论J积分的断裂韧性和双线型黏聚力模型的黏聚力以及裂缝张开位移四个指标,研究三种沥青混合料SMA-13、AC-13以及CAM在温度10℃、5℃、0℃、-5℃、-10℃下的抗裂性能。研究表明:温度在0℃以下时,采用弯曲应变密度临界值来评价沥青混合料的抗裂性能是合理的;采用断裂韧性、黏聚力和裂缝张开位移指标评价三种沥青混合料抗裂性能,测试结果是一致的。

Bending strain density threshold based on elastic damage theory,the J-integral based on elastic plastic fracture mechanics and Cohesion and crack opening displacement based on cohesive zone model were employed to evaluate the fracture resistance of asphalt mixture of SMA- 13、AC- 13 and CAM in the temperature of 10℃ 、5℃ 、0℃ 、- 5℃ 、- 10℃. The results shows that when the temperature is below 0℃,bending strain density threshold can be used to evaluate crack resistance of asphalt mixture,the test results of using fracture toughness,cohesion and crack opening displacement index to evaluate the crack resistance property of three kinds of asphalt mixture are consistent.