Cl<sup>-</sup>浓度对钢筋混凝土在土壤中腐蚀行为的影响

doi:10.11902/1005.4537.2020.207

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 705-711 DOI: 10.11902/1005.4537.2020.207

研究报告

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Cl^-浓度对钢筋混凝土在土壤中腐蚀行为的影响

丁清苗¹, 高宇宁¹(

), 侯文亮², 秦永祥¹

^1.中国民航大学机场学院天津 300300
^2.中国石油管道局工程有限公司第三工程分公司郑州 451450

Influence of Cl^- Concentration on Corrosion Behavior of Reinforced Concrete in Soil

DING Qingmiao¹, GAO Yuning¹(

), HOU Wenliang², QIN Yongxiang¹

^1.College of Airport, Civil Aviation University of China, Tianjin 300300, China
^2.No. 3 Branch Company, China Petroleum Pipeline Engineering Co. Ltd. , Zhongmu County, Zhengzhou 451450, China

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摘要:

针对环境中Cl^-侵蚀钢筋混凝土构筑物造成混凝土及其内部钢筋结构发生破坏的问题，采用数值模拟的方式研究了Cl^-对钢筋混凝土腐蚀行为的影响。结果表明，钢筋混凝土在受到Cl^-侵蚀时，试件靠近侵蚀界面的位置Cl^-浓度较大；随着实验的进行，试件内部Cl^-含量不断增加，且钢筋表面Cl^-浓度差逐渐增大。混凝土试件内部的钢筋腐蚀深度与Cl^-含量相关，钢筋表面Cl^-浓度大的位置腐蚀较为严重。此外Cl^-浓度范围在100~600 mol/m³之间时，Cl^-浓度与钢筋钝化时间T满足四次函数关系，与钢筋表面的电位E之间满足五次函数关系。

关键词 ：钢筋混凝土, 土壤, Cl^-浓度, 腐蚀, 数值模拟

Abstract：

The influence of Cl^- on the corrosion behavior of reinforced concrete was studied by means of numerical simulation method, aiming at the troubles related with the chloride ion induced corrosion of reinforced concrete structure in the environment and the damages of the concrete, as well as the reinforced bars within the concrete. The results show that: when reinforced concrete is suffered from attack in a chloride ion containing environment, the chloride ion concentration is greater in the boundary layer near the concrete surface; as the experiment progresses, the chloride ion content inside the concrete increases, and the gradient of chloride ion concentration on the reinforced steel surface gradually increases. The corrosion depth of the steel bars in the concrete is related to the chloride ion content, and the corrosion is more serious in locations where the chloride ion concentration is high on the surface of the steel bars. In addition, when the Cl^- concentration range is between 100 and 600 mol/m³, the relationship between Cl^- concentration and passivation time T of the steel bar may accord with a quartic function, while a quintic function for relationship between the Cl^- concentration and the potential E of the steel bar surface.

Key words： reinforced concrete soil Cl^- concentration corrosion numerical simulation

收稿日期: 2020-10-23

ZTFLH:

TG174

基金资助:中国民航大学基础科研服务费项目(3122019107)

通讯作者: 高宇宁 E-mail: 1365331633@qq.com

Corresponding author: GAO Yuning E-mail: 1365331633@qq.com

作者简介: 丁清苗，女，1984年生，博士，副教授

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引用本文:

丁清苗, 高宇宁, 侯文亮, 秦永祥. Cl^-浓度对钢筋混凝土在土壤中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2021, 41(5): 705-711.
Qingmiao DING, Yuning GAO, Wenliang HOU, Yongxiang QIN. Influence of Cl^- Concentration on Corrosion Behavior of Reinforced Concrete in Soil. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 705-711.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.207 或 https://www.jcscp.org/CN/Y2021/V41/I5/705

图1 钢筋混凝土物理模型

图2 钢筋混凝土网格划分模型

表1 网格划分结果统计

图3 钢筋周围Cl-浓度

图4 微元体电流流动示意图

图5 钢筋混凝土内部Cl-分布云图

图6 Cl-浓度随扩散深度变化

图7 钢筋表面Cl-浓度和腐蚀深度的变化

图8 1000 d钢筋混凝土内部Cl-分布云图

图9 钢筋最高点处Cl-浓度随时间变化

图10 钢筋脱钝时间和电极电位随Cl-浓度的变化关系

图11 不同浓度Cl- (mol/m3) 对钢筋表面腐蚀深度的影响

图12 1000 d钢筋表面腐蚀深度

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