开级配沥青混合料损伤-自愈合行为影响因素研究  

Research on Factors Affecting the Damage-healing Behavior of Open-graded Asphalt Mixtures

作　　者：徐霈[1,2,3] 李菁若 周启伟[1,2,3] 赵梦珍 XU Pei;LI Jingruo;ZHOU Qiwei;ZHAO Mengzhen(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067;National Engineering and Research center for Mountainous Highways,Chongqing 400067;National-local Joint Engineering Laboratory for Road Engineering and Disaster Prevention and Mitigation Technology in Mountainous Areas,Chongqing 400067)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]国家山区公路工程技术研究中心,重庆400067 [3]山区道路工程与防灾减灾技术国家地方联合工程实验室,重庆400067

出　　处：《公路交通技术》2022年第3期7-12,共6页Technology of Highway and Transport

基　　金：国家自然科学基金项目(51508496);贵州省交通厅科技项目(2019122018)。

摘　　要：开级配沥青混合料因具有较大的结合料黏度及孔隙率,其损伤-自愈合特性具有特殊性。基于4点弯曲疲劳试验,研究了影响大孔隙开级配排水式沥青磨耗层(OGFC)自愈合性能的因素,并通过在愈合温度、愈合湿度以及损伤程度等多种因素条件下研究了OGFC自愈合特性的影响规律。结果表明:愈合温度对OGFC的自愈合性能具有积极影响;高温愈合条件下,OGFC的自愈合效率随公称最大粒径的增大而减小;低温条件下,不同公称最大粒径的OGFC自愈合效率差异较小,自愈合速率较为缓慢;愈合湿度和损伤程度对OGFC的自愈合性能具有消极影响,当OGFC的愈合湿度超过50%,其自愈合效率显著下降,当损伤程度为75%时,OGFC-16混合料的愈合效率骤降至5%左右,表明损伤程度越大,OGFC自愈合越困难。The damage-self-healing property of open-graded asphalt mixture is special for its large binding material viscosity and void ratio In this study,four-point bending fatigue test was conducted to analyze the factors that affect the self-healing performance of the open-graded friction courses(OGFC)with large void ratio.The influence rule of healing temperature,healing humidity,and damage degree on the self-healing efficiency of OGFC were studied.The results showed that the temperature had a positive effect on the self-healing performance of OGFC.It should be noted that the self-healing efficiency of OGFC decreases with the increase of the nominal maximum size of aggregate(NMSA)at high temperatures.Whereas the self-healing efficiency of OGFC with different NMSA shows slight differences,and the self-healing rate is slow at low temperatures.In addition,the healing humidity and damage degree exhibited a negative impact on the self-healing efficiency of OGFC.Specifically.The self-healing efficiency of OGFC decreases sharply when the healing humidity exceeds 50%.When the damage degree exceeds 75%,the healing efficiency of the OGFC-16 reduced to about 5%.It indicated that the more severe the damage,the more difficult the self-healing of OGFC.

关 键 词：开级配沥青混合料 自愈合 愈合温度 愈合湿度 损伤程度 

分 类 号：U414[交通运输工程—道路与铁道工程]