Multiscale Study on Low Temperature Crack Resistance Mechanism of Steel Slag Asphalt Mixture  

作　　者：白雪峰 王岚 CHEN Xiunan BAI Xuefeng;WANG Lan;CHEN Xiunan(School of Science,Inner Mongolia University of Technology,Hohhot 010051,China;School of Civil Engineering,Key Laboratory of Civil Engineering Structure and Mechanics,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Traffic De-sign Institute Co.LTD,Hohhot 010050,China)

机构地区：[1]School of Science,Inner Mongolia University of Technology,Hohhot 010051,China [2]School of Civil Engineering,Key Laboratory of Civil Engineering Structure and Mechanics,Inner Mongolia University of Technology,Hohhot 010051,China [3]Inner Mongolia Traffic De-sign Institute Co.LTD,Hohhot 010050,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第3期705-715,共11页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.11962024);Key Technology Project of Inner Mongolia Autonomous Region(No.2019GG031)。

摘　　要：The objective of this paper was to study low temperature crack resistance mechanism of steel slag asphalt mixture(SAM).Thermal stress restrained specimen test(TSRST)and three-point bending test were carried out to evaluate the low-temperature crack resistance of SAM and basalt asphalt mixture(BAM).Based on the digital image correlation technique(DIC),the strain field distribution and crack propagation of SAM were analyzed from the microscopic point of view,and a new index,crack length factor(C),was proposed to evaluate the crack resistance of the asphalt mixture.The crystal phase composition and microstructure of steel slag aggregate(SA)and basalt aggregate(BA)were studied by X-ray diffraction(XRD)and scanning electron microscopy(SEM)to explore the low-temperature crack resistance mechanism of SAM.Results show that the low-temperature crack resistance of SAM is better than that of BAM;SAM has good integrity and persistent elastic deformation,and its bending failure mode is a hysteretic quasi-brittle failure;The SA surface is evenly distributed with pores and has surface roughness.SA has the composition phase of alkaline aggregate-calcite(CaCO3),so it has good adhesion to asphalt,which reveals the mechanism of excellent low-temperature crack resistance of SAM.

关 键 词：steel slag asphalt mixture ·low-temperature crack resistance ·strain energy density ·XRD SEM 

分 类 号：X757[环境科学与工程—环境工程] U414[交通运输工程—道路与铁道工程]