[1]郭增伟,陈旦,姚国文,等.考虑钢筋阻滞效应的近海环境中混凝土内钢筋初锈时间预测[J].东南大学学报(自然科学版),2019,49(1):46-52.[doi:10.3969/j.issn.1001-0505.2019.01.007]
 Guo Zengwei,Chen Dan,Yao Guowen,et al.Prediction of initial corrosion time of steel bar in concrete in offshore environment considering blocking effects[J].Journal of Southeast University (Natural Science Edition),2019,49(1):46-52.[doi:10.3969/j.issn.1001-0505.2019.01.007]
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考虑钢筋阻滞效应的近海环境中混凝土内钢筋初锈时间预测()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第1期
页码:
46-52
栏目:
交通运输工程
出版日期:
2019-01-20

文章信息/Info

Title:
Prediction of initial corrosion time of steel bar in concrete in offshore environment considering blocking effects
作者:
郭增伟陈旦姚国文张俊波
重庆交通大学土木工程学院, 重庆 400074
Author(s):
Guo Zengwei Chen Dan Yao Guowen Zhang Junbo
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
关键词:
桥梁 钢筋混凝土 近海环境 氯离子 钢筋阻滞作用
Keywords:
bridge reinforced concrete marine environment chloride blocking effects of reinforcement
分类号:
U441.3
DOI:
10.3969/j.issn.1001-0505.2019.01.007
摘要:
为探讨氯离子扩散进程中钢筋的阻滞效应,利用交替隐式有限差分方法实现了钢筋混凝土中氯离子二维浓度场的求解,研究了钢筋直径、保护层厚度、混凝土表面氯离子浓度等因素对混凝土内部自由氯离子扩散进程的影响,探讨了钢筋阻滞效应对腐蚀速率、钢筋脱钝时间和混凝土保护层开裂时间的影响.结果表明:受钢筋阻滞效应的影响,氯离子更多地聚集于靠近氯离子自由边界一侧的钢筋表面附近,且这种聚集效应随着钢筋直径和保护层厚度的增大越发显著,但随着扩散时间的延长,氯离子的聚集现象逐渐减弱;钢筋的阻滞效应对其锈蚀速率影响显著,同等条件下钢筋阻滞效应将使钢筋脱钝时间缩短28%,混凝土保护层开裂时间缩短22%.
Abstract:
To evaluate the blocking effects of reinforcement on chloride diffusion process in reinforced concrete, an alternating implicit finite difference method was used to calculate the two-dimensional chloride concentration field in reinforced concrete. The effects of the steel bar diameter, the thickness of the protective layer and the chloride concentration near the concrete surface on the diffusion process of free chloride ions in concrete were studied.The blocking effects of reinforcement on the corrosion rate, the depassivation time, and the cracking time of the concrete cover were also discussed. The results show that chloride ions gather to the outward region around the steel bar close to the free boundary, and the aggregation effect becomes obviously with the increase of the steel bar diameter and the thickness of the protective layer. However, the accumulation of chloride ions weakens gradually with the extension of the diffusion time. The blocking effects have a great impact on the corrosion rate of reinforcement. Under the same conditions, the desensitization time of the steel bar and the cracking time of the concrete cover layer are shortened by 28% and 22%, respectively.

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备注/Memo

备注/Memo:
收稿日期: 2018-06-12.
作者简介: 郭增伟(1985—),男,博士,副教授,博士生导师,zengweiguo@cqjtu.edu.cn.
基金项目: 国家自然科学基金资助项目(51878106)、交通运输部建设科技资助项目(2015318814190)、重庆市前沿与应用基础研究资助项目(cstc2014jcyjA30009, cstc2015jcyjBX0022)、重庆市教委科学技术研究资助项目(KJ1400333).
引用本文: 郭增伟,陈旦,姚国文,等.考虑钢筋阻滞效应的近海环境中混凝土内钢筋初锈时间预测[J].东南大学学报(自然科学版),2019,49(1):46-52. DOI:10.3969/j.issn.1001-0505.2019.01.007.
更新日期/Last Update: 2019-01-20