摘要
为研究微波加热对SBS改性沥青混合料宏观断裂—愈合性能的影响,制备AC-13型沥青混合料半圆试件,采用半圆弯曲试验和微波加热对试件进行断裂—愈合—断裂试验,采用愈合前、合后加载试验的抗拉强度比值作为愈合指数HI(healing index),分析了加热时间和微波强度对试件表面温度和沥青混合料自愈合性能的影响。研究结果表明:微波加热过程主要是集料中的极性粒子吸收微波,产生热量并传递给弱极性的沥青,实现混合料整体升温;试件表面温度随加热时间、微波强度呈良好的二元线性回归关系;在一定范围内,加热时间、微波强度的增长能够促进混合料自愈合行为,这主要与该微波条件下混合料达到的温度有关,AC-13型SBS改性沥青混合料经微波强度700 W,加热100 s或微波强度560 W,加热120s后达到最佳的强度恢复率为83%~85%,试件表面温度在90-96℃之间。
To research the effect of microwave heating on the self-healing performance of macro-fracture of SBS modified asphalt mixture,semi-circular specimens of AC-13 asphalt mixture were prepared.The fracture-healingfracture test was carried out by means of semicircular bending test and microwave heating.Taking the tensile strength ratio of loading test before and after healing as healing index HI(healing index),the effect of healing time and microwave intensity on the surface temperature of specimen and the self-healing performance of asphalt mixture was analyzed.The research results indicate that the process of microwave heating is mainly that the polar particles in the aggregate absorb the microwave,generate heat and transfer to the weak polarity asphalt,so as to realize the overall temperature rise of the mixture.The surface temperature of the specimens shows a good binary linear regression relationship with heating time and microwave intensity.In a certain range,the increase of heating time and microwave intensity can promote the self-healing behavior of mixture,which is mainly related to the temperature of mixture under the microwave condition.The optimum strength recovery rate of AC-13 SBS modified asphalt mixture is 83%~85% after heating for 100 s under microwave intensity of 700 W or heating for 120 s under microwave intensity of 560 W,and the surface temperature of the specimens is between 90℃~96℃.
作者
朱洪洲
袁海
刘玉峰
范世平
丁勇杰
ZHU Hongzhou;YUAN Hai;LIU Yufeng;FAN Shiping;DING Yongjie(Chongqing Key Laboratory of Mountainous Road Structure and Materials,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Power China Guiyang Survey,Design and Research Institute Co.,Ltd.,Guiyang 550081,Guizhou,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第8期84-89,共6页
Journal of Chongqing Jiaotong University(Natural Science)
基金
重庆交通大学研究生教育创新基金项目(2018S0113)。
关键词
道路工程
沥青混合料
自愈合
宏观断裂
微波加热
highway engineering
asphalt mixture
self-healing performance
macro-fracture
microwave heating
