基于电场分析和仿混凝土实验的杂散电流腐蚀分布规律研究

doi:10.11902/1005.4537.2021.265

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 813-818 DOI: 10.11902/1005.4537.2021.265

海洋材料腐蚀与防护专栏

本期目录 | 过刊浏览

基于电场分析和仿混凝土实验的杂散电流腐蚀分布规律研究

彭一展, 弓扶元(

), 赵羽习

浙江大学建筑工程学院杭州 310012

Distribution of Stray Current Induced Corrosion of Reinforced Bars Within Concrete Based on Electric Field Analysis and Experiment with Transparent Imitated Concrete

PENG Yizhan, GONG Fuyuan(

), ZHAO Yuxi

College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310012, China

全文: PDF(2534 KB) HTML

摘要:

为了研究杂散电流作用下混凝土等导电基体中钢筋腐蚀的宏观分布规律,开展了三维电场的有限元模拟和基于仿混凝土材料的钢筋腐蚀实验。建立三根钢筋嵌入矩形基体的有限元模型来开展数值模拟研究,讨论钢筋的锈蚀状态和基体的杂散电流电场,并进行参数分析。然后使用与数值模型相同尺寸的试件来开展腐蚀实验,将得到的钢筋腐蚀速率与模拟结果进行了对比。结果表明,应用界面极化反应与外加Maxwell宏观电场相结合的方法,可以实现杂散电流作用下钢筋腐蚀速率与基体电场的有限元模拟。此外,通过对透明基体试件的观察和三维激光扫描,可以定性和定量地评估腐蚀量的分布。

关键词 ：杂散电流, 数值模拟, 仿混凝土, 腐蚀分布, 基体电场

Abstract：

The stray current induced corrosion is a common form of corrosion that occurs in the concrete structures of electrified traction systems, which becomes more and more serious with the increasing service life. Hence, in order to clarify the spatial distribution of reinforcement corrosion in the conductive matrix like concrete in the presence of stray current, the corrosion features of reinforcement in a transparent imitated concrete was assessed experimentally, meanwhile the finite element simulation of the applied electric field was also carried out. A finite element model of three steel bars embedded in a rectangular matrix was established to carry out numerical simulation studies, the corrosion state of the steel bars and the stray current electric field of the matrix were discussed in terms of the relevant parameters. Meanwhile, the corrosion experiment of the test piece with the same size as the numerical model was carried out, and the obtained corrosion rate of the steel bars was compared with the simulation result. The results show that the corrosion rate of reinforcements and the electric field distribution in the matrix in the presence of stray current can be simulated by taking the polarization reaction with Maxwell electric field into account. In addition, the distribution of corrosion amount can be evaluated qualitatively and quantitatively by optical observation and the 3D laser scanning of the test piece with transparent matrix.

Key words： stray current numerical simulation imitated concrete corrosion distribution electric field

收稿日期: 2021-09-30

ZTFLH:

TG172.9

基金资助:国家自然科学基金(51978604);国家自然科学基金(52038010);国家自然科学基金(51820105012);国家自然科学基金(52008367)

通讯作者: 弓扶元 E-mail: gongfy@zju.edu.cn

Corresponding author: GONG Fuyuan E-mail: gongfy@zju.edu.cn

作者简介: 彭一展,男,1995年生,博士生

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引用本文:

彭一展, 弓扶元, 赵羽习. 基于电场分析和仿混凝土实验的杂散电流腐蚀分布规律研究[J]. 中国腐蚀与防护学报, 2022, 42(5): 813-818.
Yizhan PENG, Fuyuan GONG, Yuxi ZHAO. Distribution of Stray Current Induced Corrosion of Reinforced Bars Within Concrete Based on Electric Field Analysis and Experiment with Transparent Imitated Concrete. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 813-818.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.265 或 https://www.jcscp.org/CN/Y2022/V42/I5/813

图1 有限元模型尺寸及三维示意图

图2 曲线沿钢筋的起始方向和测点布置方式

图3 300和600 mm钢筋沿轴向的腐蚀速率分布

图4 沿钢筋轴向的电场强度

图5 不同输入电压下300和600 mm钢筋腐蚀速率

图6 不同钢筋直径下300和600 mm钢筋腐蚀速率

图7 腐蚀实验中的钢筋

图8 两根钢筋因腐蚀减小的横截面积—轴向距离曲线

图9 300和600 mm钢筋模拟和实验所得的腐蚀速率

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