硅藻土复配SBR改性沥青混合料的疲劳性能试验研究  

Experimental Study on Fatigue Performance of Diatomite Composite SBR Modified Asphalt Mixture

作　　者：于春辉 YU Chunhui(China Highway Engineering Consulting Corporation Co.,Ltd.,Beijing 100089,China;Zhongzi Huake Traffic Construction Technology Co.,Ltd.,Beijing 100195,China)

机构地区：[1]中国公路工程咨询集团有限公司,北京100089 [2]中咨华科交通建设技术有限公司,北京100195

出　　处：《路基工程》2023年第4期55-59,共5页Subgrade Engineering

摘　　要：为研究硅藻土复配SBR改性沥青的疲劳性能,制备了连续级配和间断级配硅藻土复配SBR改性沥青混合料,对多种类型硅藻土复配SBR改性沥青混合料展开间接拉伸疲劳性能试验,得到不同类型沥青混合料在不同温度下的疲劳方程。研究表明:混合料的类型、试验温度、硅藻土及SBR均对沥青混合料的疲劳寿命有影响;相同温度及混合料类型条件下,间断级配的疲劳寿命高于连续级配;相同级配及沥青混合料条件下,5℃条件下的疲劳寿命高于25℃的疲劳寿命;相同温度及级配条件下,硅藻土、SBR均可提高基质沥青混合料的疲劳寿命,表现为疲劳方程的K值增大,n值减小,且硅藻土对疲劳方程系数的影响程度大于SBR,即硅藻土复配SBR改性沥青混合料疲劳寿命的提高主要取决于硅藻土。In order to study the fatigue properties of diatomite composite SBR modified asphalt,continuous graded and intermittent graded diatomite composite SBR modified asphalt mixtures were prepared.Indirect tensile fatigue tests were conducted on various types of diatomite composite SBR modified asphalt mixtures,and the fatigue equations of different types of asphalt mixtures at different temperatures were obtained..The research shows that the type of mixture,test temperature,diatomite and SBR all have an impact on the fatigue-life of asphalt mixture.Under the same temperature and mixture type conditions,the fatigue-life of discontinuous gradation is higher than that of continuous gradation.Under the same gradation and asphalt mixture conditions,the fatigue-life at 5℃is higher than the fatigue-life at 25℃.Under the same temperature and grading conditions,both diatomite and SBR can improve the fatigue-life of the matrix asphalt mixture,manifested by an increase in the K value of the fatigue equation and a decrease in the n value,and the influence of diatomite on the coefficient of the fatigue equation is greater than that of SBR,that is,the improvement of the fatigue-life of the diatomite composite SBR modified asphalt mixture mainly depends on diatomite.

关 键 词：公路工程 硅藻土 SBR 疲劳性能 间接拉伸试验 

分 类 号：U414[交通运输工程—道路与铁道工程]