基于VECD理论的沥青砂浆疲劳性能研究  

Research on Fatigue Performance of Asphalt Mortar Based on VECD Theory

作　　者：易浩 陈雄威 梁国烯 杜成林 卢宏 杨新宇 刘宏富[2] YI Hao;CHEN Xiongwei;LIANG Guoxi;DU Chenglin;LU Hong;YANG Xinyu;LIU Hongfu(Poly Changda Engineering Co.,Ltd.,Guangzhou,Guangdong 510620,China;School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning,Guangxi 530007,China)

机构地区：[1]保利长大工程有限公司,广东广州510620 [2]长沙理工大学交通运输工程学院,湖南长沙410114 [3]广西交科集团有限公司,广西南宁530007

出　　处：《公路工程》2024年第6期113-119,126,共8页Highway Engineering

基　　金：国家自然科学基金资助项目(52078064)。

摘　　要：沥青砂浆的疲劳特性与沥青混合料的疲劳特性密切相关,为了探究沥青砂浆的疲劳性能,以基质沥青、高模量改性沥青、SBS改性沥青3种沥青砂浆为研究对象,进行了单轴压缩动态模量试验、直接拉伸疲劳试验。基于VECD模型计算了动态模量比,建立了3种沥青砂浆的C-S疲劳特征曲线;提出了疲劳评价参数D^(R),对3种沥青砂浆的疲劳损伤特性进行了评价。结果表明:C-S损伤特征曲线的相对位置可以评价沥青砂浆的抗疲劳性能,高模量改性沥青砂浆的抗疲劳性能最好,SBS改性沥青砂浆次之,基质沥青砂浆抗疲劳性能最差。疲劳评价参数D^(R)值的大小和虚正割模量降低速度也可以评价沥青砂浆的疲劳性能,且D^(R)值是一种与应变水平无关的材料常数。沥青砂浆在疲劳试验下的损伤演变过程可以由C-S曲线进行较好的描述,疲劳评价参数D^(R)能更好地评价不同沥青砂浆之间的疲劳性能差异。The fatigue properties of asphalt mortar are closely related to the fatigue properties of asphalt mixture.To explore the fatigue properties of asphalt mortar.Taking base asphalt,SBS-modified asphalt,and high modulus asphalt as the research objects,the uniaxial compression dynamic modulus test,and direct tensile fatigue test was carried out;the dynamic modulus ratio was calculated based on the Viscoelastic Continuous Damage(VECD)model,and the C-S fatigue characteristic curves of three kinds of asphalt mortars were established;the fatigue evaluation parameter D^(R) was proposed,and the fatigue damage characteristics of three kinds of asphalt mortars were evaluated.The results show thatthe relative position of the C-S damage characteristic curve can evaluate the fatigue resistance of asphalt mortar.The high modulus asphalt mortar has the best anti-fatigue performance,followed by SBS-modified asphalt mortar,and the matrix asphalt mortar has the worst anti-fatigue performance.The magnitude of the fatigue evaluation parameter D^(R) and the rate of decrease in virtual secant modulus can also evaluate the fatigue performance of asphalt mortar.And the D^(R) value is a material constant that is independent of the strain level.The C-S curve can better describe the damage law of asphalt mortar during the fatigue test,the fatigue evaluation parameter D^(R) can better evaluate the fatigue performance difference between different asphalt mortars.

关 键 词：沥青砂浆 单轴压缩动态模量试验 直接拉伸循环疲劳试验 VECD模型 C-S曲线 

分 类 号：U414[交通运输工程—道路与铁道工程]