沥青混合料自愈合特性四点弯曲疲劳试验研究.pdf

第18卷第4期
建筑材料学报
ol.18,No.4
2015年8月
JOURNAL OF BUILDING MATERIALS
Aug,,2015
文章编号:1007-9629(2015)04-0572-06
沥青混合料自愈合特性四点弯曲疲劳试验硏究
黄卫东,李本亮',黄明
(1.同济大学道路与交通工程教育部重点实验室,上海201804;
2..上.海市政工程设计研究总院博士后工作站,上海200092)
摘要:通过应变控制四点弯曲疲劳试验,变化加載频率分析沥青混合料的即时自愈合,变化愈合温
度、时间、荷载和损伤程度分析沥青混合料的后期自愈合.结果表明:沥青混合料的即时自愈合伴
随加载产生,愈合效果为 SBS-AC13>TB-AC13>基质-AC13;愈合温度、时间、荷载对沥青混合料
的后期愈合具有正面作用,而损伤程度具有负面作用;橡胶沥青混合料疲劳寿命对自愈合条件的
偯赖性小于SBS沥青混合料,对沥青用量变化敏感性低于SBS沥青混合料;橡胶沥青混合料的劲
度模量恢复率大于疲劳寿命恢复率,且疲劳寿命恢复率的离散性較大,動度模量恢复率的离散性
较小
关键词:沥青混合料;四,点弯曲疲劳试验;自愈合特性
中图分类号:U414
文獻标志码:A
doi:10.3969/j.issn,1007-9629.2015.04.007
Evaluation of Self-healing of Asphalt Mixture Through
Four-point Bending Fatigue Test
HUANG Weidong
LI Benliang FUANG Ming
(1. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804
China 2. Postdoctoral Workstation, Shanghai Municipal Engineering Design Institute(Group) Co., Ltd.
Shanghai 200092, China)
Abstract: To analyze self-healing characteristic of asphalt mixture, variable loading frequencies for syn
chronous self-healing and variable rest period conditions for after loading self-healing were conducted
through four point bending fatigue test. The results indicate that synchronous self-healing is induced by
loading, and the ratio of fatigue life(RL) of synchronous self-healing for different type of mixture ranges in
SBS-AC13TB-AC13>Virgin asphalt-ac13. Rest period temperature, rest time and extra load have pos
itive influence on after loading self-healing while damage ratio has negative influence on after loading self
healing. After loading self-healing of AR mixture is less influenced by rest period conditions than SBS mix-
ture, also less sensitive to asphalt content than SBS mixture. Stiffness recovery is bigger than fatigue life
recovery in evaluating after load self-healing while fatigue life recovery is scattered but stiffness recovery is
stable
Key words: asphalt mixture; four-point bending fatigue test; self-healing
沥青材料具有自愈合能力,传统的疲劳研究的自愈合是劲度模量和强度的自我修复过程,它
大多没有考虑沥青的这种愈合能力,从而低估了发生在损害过程中、停歇状态下或高温期间.许
沥青材料的疲劳寿命. Bazin等认为,沥青材料多研究18均证明了沥青材料的自愈合特性,并
收稿日期:2013-11-14:修订日期:2014-06-30
基金项目:河北省交通运输厅科技计划项目(Y-070201)
第一作者:黄卫东(1970一),男,四川安岳人,同济大学研究员,博士生导师,博土. E-mail: hwd@ tong].cdu,cn