[1]朱方之１,马志鸣２,蒋连接１,等.持载和冻融循环对钢筋混凝土粘结性能的影响[J].西安建筑科技大学学报(自然科学版),2016,48(05):643-647.[doi:10.15986/j.1006-7930.2016.05.005]
　ZHU Fangzhi,MA Zhiming,JIANG Lianjie,et al.Study of influence of sustained load and freeze-thaw cycling on the bond behavior of steel reinforced concrete[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2016,48(05):643-647.[doi:10.15986/j.1006-7930.2016.05.005]
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持载和冻融循环对钢筋混凝土粘结性能的影响()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
48
期数:
2016年05期
页码:
643-647
栏目:
出版日期:
2016-10-31

文章信息/Info

Title:
Study of influence of sustained load and freeze-thaw cycling on the bond behavior of steel reinforced concrete
文章编号:
1006-7930(2016)05-0643-05
作者:
朱方之１; 马志鸣２; 蒋连接１; 左 工１
(1. 宿迁学院建筑工程学院,江苏 宿迁 223800 ;2. 同济大学建筑工程系,上海 200092 )
Author(s):
ZHU Fangzhi 1;  MA Zhiming 2;  JIANG Lianjie 1;  ZUO Gong 1
(1. School of Civil Engineering and Architecture, Suqian College , Suqian 223800 , China ; 2. Department of Building Engineering, Tongji University, Shanghai 200092, China)
关键词:
粘结性能; 持载; 冻融循环; 混凝土
Keywords:
bond behavior;  sustained load;  freeze-thaw cycling;  concrete
分类号:
TU 502.6
DOI:
10.15986/j.1006-7930.2016.05.005
文献标志码:
A
摘要:
通过中心拉拔试验，研究了钢筋持载与冻融循环耦合作用下钢筋混凝土的粘结性能退化规律．结果表明，冻融循环低于25次时，钢筋持载和冻融耦合对非引气混凝土粘结强度和峰值滑移影响较弱；冻融循环50次时，持载30%和50%试件的极限粘结强度分别降低22.8%和48.5%．即混凝土冻融损伤存在一个阙值．当冻融损伤低于该值，钢筋持载的耦合效应不明显；反之，冻融损伤高于该值，钢筋持载和冰胀压力相互促进冻融裂缝的开展，加速钢筋混凝土粘结性能退化过程，甚至在服役过程中提前发生劈裂破坏．另外，钢筋持载和冻融循环耦合作用对引气混凝土试件的粘结性能影响不明显．
Abstract:
For studying the degradation law of cohesive property in reinforced concrete under the coupling effect of sustained load of steel and freeze-thaw damage, the fresh concrete and air entrained concrete are respectively prepared. After different freeze-thaw cycles, the cohesive property between concrete and steel was tested through a p ull-out test of steel. The results show that the influence of combined action on the bonding strength and peak value of slip is not obvious when the freeze-thaw cycles are below 25 times. Then the freeze-thaw cycles reach 50 times, the bonding strength of concrete with 30% and 50% percentage of ultimate load respectively decrease by 22.8% and 44.5%, which shows that a threshold existed. When the freeze-thaw damage is below the threshold, the coupling effect caused by sustained load of steel is not significant . However, the coupling effect becomes more obvious when the freeze-thaw damage is above the threshold. The coupling effect between the sustained load of steel and expansion pressure accelerates the crack development, which leads to the degeneration of cohesive property and s plitting failure in reinforced concrete. Moreover, the influence of coupling effect on the cohesive property is not obvious for air -entrained concrete.

参考文献/References:

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备注/Memo

备注/Memo:
基金项目：江苏省高校自然科学研究项目(14KJB560016)；宿迁市重点实验室资助项目(M201506)
收稿日期：2013-05-08 修改稿日期：2016-10-10
作者简介：朱方之(1973－)，男，博士，副教授，从事混凝土材料与结构耐久性研究. E-mail: fzzhu@sqc.edu.cn
更新日期/Last Update: 2016-11-24