不同尺寸玄武岩纤维混掺沥青混合料抗裂性能研究  

Research on Crack Resistance of Asphalt Mixtures Mixed with Basalt Fibers of Different Sizes

作　　者：张江北 徐永丽[1] 王心智 刘彦程 陈少毅 ZHANG Jiangbei;XU Yongli;WANG Xinzhi;LIU Yancheng;CHEN Shaoyi(College of Civil Engineering and Transportation,Northeast Forestry University,Harbin 150040,China;Longjian Road and Bridge Company Limited,Harbin 150000,China;Heilongjiang Longjian Road and Bridge Sixth Engineering Company Limited,Harbin 150000,China)

机构地区：[1]东北林业大学土木与交通学院,哈尔滨150040 [2]龙建路桥股份有限公司,哈尔滨150000 [3]黑龙江省龙建路桥第六工程有限公司,哈尔滨150000

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第3期557-561,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：龙建路桥股份有限公司科技项目(230000100004258220007)。

摘　　要：针对常规沥青路面材料开裂问题,提出通过不同长度的玄武岩纤维混掺来改善沥青混合料的抗裂性能.选取-10℃、-20℃、-30℃低温开裂温度及15℃、25℃疲劳开裂温度,通过低温小梁弯曲试验和SCB半圆弯拉试验测试抗裂效果,SEM扫描电镜分析断裂面微观形貌,研究7种不同长度玄武岩纤维混掺方案下沥青混合料的抗裂性能.结果表明:纤维混掺有利于延缓开裂速度,增强低温抗裂性.在半圆弯拉试验中观察到裂缝首先出现在峰值荷载的80%处,并在卸载阶段迅速扩大.混掺比例为3∶2时表现出最佳综合抗裂效果,较无纤维沥青混合料及单掺纤维沥青混合料的抗裂效果提升显著.Aiming at the cracking problem of conventional asphalt pavement materials,it is proposed to improve the cracking resistance of asphalt mixture by mixing basalt fibers with different lengths.The low-temperature cracking temperatures of-10℃,-20℃and-30℃and the fatigue cracking temperatures of 15℃and 25℃were selected,and the anti-cracking effect was tested by low-temperature trabecular bending test and SCB semi-circular bending test.The micro-morphology of fracture surface was analyzed by SEM,and the crack resistance of asphalt mixture under seven different basalt fiber mixing schemes was studied.The results show that fiber blending is beneficial to delay the cracking speed and enhance the low temperature cracking resistance.In the semi-circular bending-tension test,it was observed that the crack first appeared at about 80%of the peak load,and expanded rapidly in the unloading stage.When the mixing ratio is 3∶2,it shows the best comprehensive anti-cracking effect,which is significantly higher than that of fiber-free asphalt mixture and fiber-only asphalt mixture.

关 键 词：纤维混掺 玄武岩纤维 沥青混合料 抗裂性能 SCB试验 

分 类 号：U414[交通运输工程—道路与铁道工程]