干湿循环作用对沥青混凝土高温性能的影响分析

Influence of Wet and Dry Circulation on High Temperature Performance of Asphalt Concrete

制备了SBS改性沥青I-C混凝土AC-13,采用20℃、40℃和60℃恒温湿润12h干燥12h的方法进行了4至36次干湿循环,分别测试了高温抗压强度、蠕变特性和动稳定性,分析了干湿循环对沥青混凝土高温性能的影响。研究结果表明:沥青混凝土的高温单轴抗压强度随干湿循环的增大而减小;沥青混凝土粘性流动随着干湿循环次数的增加而明显增强;沥青混凝土的车辙深度随干湿循环次数的增大而增大。

SBS modified asphalt I-C concrete AC-13 was prepared.4 to 36 dry and wet cycles were conducted by constant temperature and humidity of 20℃,40℃ and 60℃ for dry 12 h and wet 12 h respectively.The compressive strength,creep property and dynamic stability at high temperature were measured respectively.The influence of wet and dry cycle on high temperature performance of asphalt concrete was analyzed.The results show that the high temperature uniaxial compressive strength of asphalt concrete decreases with the increase of wet and dry cycle.The viscous flow of asphalt concrete increases with the increase of the number of wet and dry cycles.The rutting depth of asphalt concrete increases with the increase of the number of wet and dry cycles.