沥青-集料界面断裂能的测试方法与影响因素  

Fracture Energy Test Method and Influencing Factors of Asphalt-Aggregate Interface

作　　者：邓凯聆 王端宜[1] 方秋萍 DENG Kailing;WANG Duanyi;FANG Qiuping(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2023年第8期12-20,共9页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51278203);广东省自然科学基金资助项目(2019A1515011965)。

摘　　要：表面脱粒是沥青路面常见病害之一,会对沥青路面的耐久性和路用性能产生极大不利影响。为解决沥青路面脱粒预测和敏感性分析所需要的沥青-集料界面断裂能实测问题,本研究提出了摆式冲击试验的测试方法,通过对“集料-沥青-集料”试件施加横向剪切冲击荷载,使得沥青与集料界面发生破坏并测试其断裂能。研究中对温度、沥青种类、集料类型、水、矿粉等因素对沥青-集料界面断裂能的影响进行了分析,结果表明:沥青-集料界面断裂能可作为评价沥青-集料界面性能的指标,综合体现了沥青-集料粘附性能和沥青内聚性能,以及不同温度、荷载条件作用下沥青-集料界面的力学特性;温度对沥青-集料界面断裂能影响较大,随着温度升高沥青-集料界面断裂能呈现先上升后下降的趋势,且沥青与集料粘附性能逐渐提高,沥青内聚性能逐渐降低;SBS改性沥青和高粘改性沥青与集料的界面断裂能明显大于基质沥青,但两种改性沥青与集料的界面断裂能除峰值外差异不显著;集料类型对沥青-集料界面断裂能的影响不具有显著规律;在各个温度下水都会使沥青-集料界面断裂能发生衰减;在沥青中加入矿粉会使界面断裂能下降,基于沥青混合料性能的最佳粉胶比范围,并不一定对沥青-集料界面性能起到积极影响。摆式冲击试验所测定的沥青-集料界面断裂能不仅可以作为定量评价沥青材料与集料界面性能的依据,同时也可以为脱粒病害的数值模拟分析提供材料参数,为脱粒病害的预测和敏感性分析提供判断依据,从而为沥青路面抗脱粒精准设计奠定基础。As one of the common diseases of asphalt pavement,raveling can have a great adverse effect on the durability and road performance of asphalt pavement.To solve the problem of obtaining the asphalt-aggregate interface fracture energy required for asphalt pavement raveling prediction and sensitivity analysis,this research proposed a pendulum impact test method,by which the fracture energy of asphalt-aggregate interface was obtained by conducing lateral shear impact loading on“aggregate-asphalt-aggregate”specimens,causing a negligent failure at asphalt-aggregate interface.The research also analyzed the effects of temperature,asphalt type,aggregate type,water,and mineral filler on the asphalt-aggregate interface fracture energy.The results show that the asphalt-aggregate interface fracture energy can be used as the indicator to evaluate the asphalt-aggregate interface performance,reflecting the asphalt-aggregate adhesion performance,asphalt internal cohesion performance,and the mechanical characteristics of the asphalt-aggregate interface under different temperatures and loading conditions.Temperature has a great influence on the fracture energy of the asphalt-aggregate interface.As the temperature raises,the asphalt-aggregate interface fracture energy shows an upward trend followed by a downward trend,and the adhesion of asphalt and aggregate increases gradually,while the asphalt cohesion decreases.The fracture energy of SBS modified asphalt-aggregate interface and high-viscosity asphalt-aggregate interface are significantly greater than that of 70#asphalt-aggregate interface,while the difference between the fracture energy of the two modified asphalt and aggregate is not significant except for the peak value.The effect of aggregate types on the fracture energy of the asphalt-aggregate interface has no significant rule.Water will reduce the fracture energy of the asphalt-aggregate interface at all temperatures.The addition of mineral filler to asphalt can decrease the interface fracture energy and the range of op

关 键 词：沥青路面 表面脱粒 沥青-集料界面 断裂能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]