基于立方体试件的沥青混合料双轴压缩试验研究  

Biaxial compression test of asphalt mixture based on cubic specimen

作　　者：锁利军[1,2] 栗培龙 王秉纲[1] 郑传超[1] SUO Lijun;LI Peilong;WANG Binggang;ZHENG Chuanchao(Key laboratory of Highway Engineering in Special Region of Ministry of Education,Chang’an University,Xi’an 710064,Shaanxi,China;Civil and construction Engineering Department,Shanxi Institute of Technology,Yangquan 045000,Shanxi,China)

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]山西工程技术学院土木与建筑工程系,山西阳泉045000

出　　处：《河南理工大学学报（自然科学版）》2022年第6期203-210,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51878061);山西省高等学校科技创新项目(2021L594)。

摘　　要：为研究第二主应力对沥青混合料强度的影响,考虑轴数、温度与加载速度3个因素,采用设计的双轴压缩试验仪器对立方体试件进行沥青混合料双轴压缩试验。结果表明:影响沥青混合料强度的显著顺序由大到小为轴数、加载速率;温度以5℃为间隔,从15℃变化到25℃时对沥青混合料强度影响不显著。应变分别小于0.020,0.010,0.008时,应力-应变曲线基本重合。应变增加时,应力-应变曲线非线性增大;油石比大于5%时,立方体试件双轴压缩强度增长趋势缓后有降,且随空隙率增大逐渐降低。In order to study influence of the second principal stress on strength of asphalt mixture,based on cubic specimen,the biaxial test instrument is designed and the biaxial test of asphalt mixture is put forward. Strength of asphalt mixture in different condition is tested on the base of orthogonal experimental design,which includes three factors,such as axial number,temperature and loading velocity. The results show that,for a given significant level,orthogonal experimental design range analysis and variance analysis show that axial number has the most obvious influence on strength of asphalt mixture in three different factors,as followed by loading velocity. On the other hand,when test temperature interval is 5 centigrade,and test temperature is from 15 centigrade to 25 centigrade,variance analysis shows that temperature has not obvious influence on strength of asphalt mixture. Strain were 0. 020(15 ℃),0. 010(20 ℃)and 0. 008(25 ℃)respectively,curves of stress and strain of different loading velocity in the same temperature are same. After that,curves of stress and strain go and increase nonlinearly. When bitumen-aggregate ratio values were bigger than 5%,biaxial cubic strength slowly,after that,biaxial cubic strength begin to decrease. Biaxial cubic strength decreases with the increasing voidage.

关 键 词：道路工程 沥青混合料 双轴压缩强度 轴数 加载速率 

分 类 号：U414[交通运输工程—道路与铁道工程]