摘要
进行电化学修复后钢筋混凝土的低周往复黏结滑移试验,分析了电流密度及时间效应对黏结-滑移性能的影响。结果表明,低周往复荷载下钢筋与混凝土的黏结应力随着循环次数的增加而降低,电化学修复会致使钢筋混凝土黏结性能退化,3 A/m^(2)的电流密度下峰值黏结应力下降62.9%;电化学修复后静置一段时间后,电化学修复引起的峰值黏结应力和残余黏结应力的下降现象得到恢复,30 d可基本恢复至未电化学处理水平。
The bond-slip test of reinforced concrete under low cyclic loading after electrochemical repair is carried out,and the influence of current density and time effect on the bond-slip performance of reinforced concrete is analyzed.The results show that the bond stress of reinforced concrete decreases with the increase of cycles under low cyclic loading.Electrochemical repair will lead to the degradation of the bond performance of reinforced concrete,and the current density of 3 A/m~2 will cause the decrease of peak bond stress by 62.9%.Electrochemical repair will aggravate the difference of residual bonding stress under reciprocating loading.Considering the time effect,the decrease of peak bond stress and residual bond stress caused by electrochemical repair can be restored,and can be basically restored to the level without electrochemical treatment after 30 days.
作者
王向林
毛江鸿
宋志刚
薛倩倩
张军
WANG Xianglin;MAO Jianghong;SONG Zhigang;XUE Qianqian;ZHANG Jun(School of Civil Engineering,Kunming University of Science and T echnology,Kunming 650500,China;College of Architecture and Environment,Sichuan University,Chengdu 610065,China;School of Civil Engineering and Architecture,Ningbo Technology University,Ningbo 315100,China)
出处
《混凝土》
CAS
北大核心
2022年第7期34-38,共5页
Concrete
基金
国家自然科学基金(51878610,52108177)。
关键词
低周往复
黏结滑移
电化学修复
时间效应
low cyclic loading
bond slip
electrochemical repair
time effect
