基于SCB试验的沥青混合料低温抗裂性研究  

Cracking Resistant of Asphalt Mixture at the Low Temperature Based on the SCB Test

作　　者：李萍[1] 吴中[1] 马科[1] 张雅莉[1] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050

出　　处：《武汉理工大学学报（交通科学与工程版）》2015年第2期238-241,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目资助(批准号:51108222)

摘　　要：通过SCB试件(半圆弯拉试件),采用正交试验设计方法对连续和间断级配的沥青混合料在不同外加剂(styrene butadiene styrene,SBS)含量下进行低温SCB试验.结果表明:在SCB试验中,对试验结果影响最大的是沥青混合料本身的级配类型,其次为试验温度,最后为SBS含量;间断级配(SMA)的沥青混合料在低温时的力学性能明显低于密级配(AC)的沥青混合料;推荐使用级配类型为AC-16,SBS含量为5%的沥青混合料来满足路面设计低温抗裂的要求.The tensile strength is one of the key indicators to measure the crack resistant of the asphalt pavement structure.Based on the SCB specimen（the specimen of semicircle）,orthogonal experimental is used to test asphalt mixture of continuous gradation and gap-graded bituminous mixture in different admixture（SBS：Styrene Butadiene Styrene）contents.The results show that the gradation type of the asphalt mixture is the highest of the three,with the test temperature the SBS contents.The mechanical properties of gap-graded bituminous mixture（SMA）are significantly lower than that of the dense-graded（AC）of mixture asphalt at the low temperature;the asphalt mixtures with 16 mm Nominal Maximum Aggregate Size（NMAS）is recommended as the gradation type of asphalt mixture,5%SBS contents are the best for the low temperature cracking in the pavement design.

关 键 词：抗拉强度 正交试验设计 沥青混合料 低温SCB试验 

分 类 号：U416[交通运输工程—道路与铁道工程]