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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (3): 483-490    DOI: 10.3785/j.issn.1008-973X.2020.03.008
土木工程     
钢筋加速非均匀锈蚀试验方法和锈蚀形态研究
金南国1(),何家豪1,付传清2,*(),金贤玉1
1. 浙江大学 建筑工程学院，浙江 杭州 310058
2. 浙江工业大学 建筑工程学院，浙江 杭州 310014
Study on experimental method and morphology of accelerated non-uniform corrosion of steel bars
Nan-guo JIN1(),Jia-hao HE1,Chuan-qing FU2,*(),Xian-yu JIN1
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China
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摘要：

采用自主发明的通电加速钢筋非均匀锈蚀试验方法，以不锈钢丝作为辅助电极对混凝土试件进行通电加速锈蚀，利用三维激光扫描技术获得不同锈蚀率下锈蚀钢筋的三维几何模型，研究采用该方法时锈蚀钢筋的不均匀性. 研究发现，由此可以得到与实际自然锈蚀情况相似的不均匀锈蚀现象，即靠近不锈钢丝一侧锈蚀比较严重，远离不锈钢丝一侧锈蚀较少. 根据对锈蚀钢筋纵向截面积的分析，建立不均匀系数R的概率分布模型，其值满足Gumbel极值分布；将模型与实际自然锈蚀的钢筋不均匀系数R的概率分布进行比较，进一步验证该方法用于评估钢筋混凝土构件承载力的可行性.
关键词： 通电锈蚀;  不均匀性;  三维激光扫描;  概率分布    
Abstract:

An innovative test method of non-uniform corrosion was developed to investigate the non-uniformity of steel bar corrosion in concrete. The corrosion of steel bar in concrete was accelerated by the electrification between a pre-embedded stainless steel wire and the steel bar in concrete specimen. The 3D geometric model of steel bar corrosion at different corrosion rates was obtained using the 3D laser scanning technology. Results indicate that the non-uniform corrosion behavior of steel bar obtained by this method was similar to that from the condition of natural corrosion. That is, the corrosion in concrete near the stainless steel wire is much severer than that far away from the stainless steel wire. The probability distribution model of the non-uniform coefficient R, which was established from the longitudinal cross section area of corroded steel bar, agreed well with the Gumbel extreme value distribution. Compared with the probability distribution of the non-uniform coefficient R under natural corrosion, the feasibility of this method in evaluation of the bearing capacity for reinforced concrete members is further verified.
Key words: electrochemical corrosion    non-uniformity    3D laser scanning    probability distribution
收稿日期: 2019-02-24 出版日期: 2020-03-05
CLC:  TU 375  
基金资助: 国家“973”重点基础研究发展规划资助项目（2015CB655103）；国家自然科学基金资助项目（51978620，51678529，51578497）
通讯作者: 付传清     E-mail: jinng@zju.edu.cn;chqfu@zju.edu.cn
作者简介: 金南国（1959—），男，教授，博士. 从事混凝土结构耐久性研究. orcid.org/0000-0003-4780-624X. E-mail： jinng@zju.edu.cn
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引用本文:

金南国,何家豪,付传清,金贤玉. 钢筋加速非均匀锈蚀试验方法和锈蚀形态研究[J]. 浙江大学学报(工学版), 2020, 54(3): 483-490.

Nan-guo JIN,Jia-hao HE,Chuan-qing FU,Xian-yu JIN. Study on experimental method and morphology of accelerated non-uniform corrosion of steel bars. Journal of ZheJiang University (Engineering Science), 2020, 54(3): 483-490.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.03.008    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I3/483

图 1  不锈钢丝到钢筋表面各点之间的距离
图 2  钢筋非均匀锈蚀形态
水灰比 水泥 细骨料 粗骨料 水
0.53 370 750 1 112 188
表 1  混凝土配合比
图 3  钢筋混凝土试件示意图
试件编号 i/（ ${\rm{\mu A}} \cdot {\rm{c}}{{\rm{m}}^{{\rm{ - 3}}}}$） ρ0/ % t/h
A12-1 300 5 74.6
A12-2 10 373
A12-3 15 1 119
表 2  混凝土试件通电时间计划表
图 4  通电加速锈蚀装置
图 5  锈蚀钢筋与三维重构模型
图 6  钢筋切分示意图
图 7  不同锈蚀率下混凝土试件锈胀裂缝分布图
图 8  钢筋非均匀锈蚀锈层局部放大图
图 9  不同锈蚀率的锈蚀钢筋与三维重构模型图
试件编号 ρ0 ρ ρav w
A12-1 5 4 4.0 0
A12-2 10 8 7.7 3.7
A12-3 15 11 10.7 2.7
表 3  钢筋通电锈蚀理论锈蚀率、质量锈蚀率与三维扫描计算平均锈蚀率对比
图 10  锈蚀钢筋残余面积与截面锈蚀率分布图　　　　　
图 11  部分通电非均匀锈蚀钢筋轮廓曲线图　　　　　
图 12  通电均匀锈蚀与非均匀锈蚀钢筋轮廓对比图
图 13  不同质量锈蚀率下锈蚀钢筋R值频率分布以及分布验证
图 14  Gumbel极值分布的位置参数μ、尺度参数σ与质量锈蚀率ρ之间的关系
图 15  不同质量锈蚀率下的R值概率密度分布图
图 16  自然锈蚀与通电非均匀锈蚀的R值概率密度分布图
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