Analysis of Microscopic Structure of Composite Fiber Asphalt Mixture Subjected to Repeated Loading Under High Temperature
ZHANG Hang1, 2, HAO Peiwen3, LING Tianqing1, WANG Xuewu2, HE Liang1
1 College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074; 2 Engineering Quality Supervision Bureau of Sichuan Provincial Transport Department, Chengdu 610041; 3 Key Laboratory for Road Structure and Material of Communications Industry, Chang’an University, Xi’an 710064;
Abstract: In order to study the influence of the composite fiber on the asphalt mixture fine microstructure under high tempe-rature and repeated loading, the accelerated loading test was carried out to investigate the rutting depth of asphalt mixture with additional three kinds of composite fiber and without fiber. CT scan test was utilized to examine the variation of average void volume and coarse aggregate inclination before and after accelerated loading test. The results implied that under high temperature repeated loa-ding, asphalt mixture adding three kinds of composite fiber can improve the anti-rutting ability of asphalt mixture, the asphalt mixture with composite fiber Ⅲ can reduce rutting depth of 61%. After adding three kinds of composite fiber, the mixture average void volume was decreased and coarse aggregate level angle was increased. Under high temperature and repeated loading, three kinds of composite fiber can significantly retard the increase of average pore volume of asphalt mixture, which increased less than 13%, and simultaneously slower the decrease of coarse aggregate level angle, which decreased less than 6.6 degrees. There is a good linear correlation of the rutting depth of asphalt mixture with the average volume of voids and the inclination of coarse aggregate.
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2018, Vol. 32 
