冲击荷载下橡胶改性沥青混凝土的动力学性质  

Dynamic Properties of Crumb Rubber Modified Asphalt Concrete under Impact Loading

作　　者：曾梦澜[1] 黄海龙[1] 彭良清[1] 吴盛华[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2011年第12期1-7,共7页Journal of Hunan University:Natural Sciences

基　　金：湖南省交通运输厅2009年度科技进步与创新计划项目(200914)

摘　　要：采用分离式Hopkinson压杆(Split Hopkinson Pressure Bar,SHPB)试验,探讨了冲击荷载下橡胶改性沥青混凝土的动力学性质.试验结果与分析显示:在冲击荷载作用下,橡胶的加入可以使沥青混凝土的塑性明显增强.沥青混凝土的动力强度与冲击韧性都是温度与应变率的函数,材料在常温25℃时的强度与韧性高于在低温-20℃及高温60℃时的值,材料强度与韧性随应变率的增大而单调提高,橡胶的加入一般可以提高材料强度与韧性,幅度分别最大超过200%与接近200%.橡胶改性沥青混凝土良好的抗冲击性能源于混凝土内部的'石料-橡胶颗粒-石料'刚柔相间接触模式,橡胶掺量存在使材料抗冲击性能最优的值,对于本文研究所用材料这个掺量约为沥青质量的20%.The Split Hopkinson Pressure Bar （Split Hopkinson Pressure Bar, SHPB） test was done to investigate the dynamic properties of crumb rubber modified asphalt concrete under impact loading. Test results and analyses have indicated that the addition of rubber can notably increase the plasticity of asphalt concrete. Both dynamic strength and impact toughness are functions of temperature and strain rate. The strength and toughness have higher values at 25 ℃ than those at -20 ℃ and 60 ℃ while increasing monotonically with the increase of strain rate. The addition of rubber can enhance the strength and toughness of the material by more than 200% and nearly 200%, respectively. The superior performance of rubber modified asphalt concrete under impact loading comes from the ＂stone-rubber-stone＂, i.e., rigid-flexible- rigid, contact made in asphalt concrete. There exists an optimized rubber with respect to the anti-impact performance of the material, which is about 20% by the mass of asphalt binder.

关 键 词：沥青混凝土 橡胶改性 SHPB试验 动力强度 冲击韧性 

分 类 号：U416.217[交通运输工程—道路与铁道工程]