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

doi:10.11902/1005.4537.2020.207

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

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

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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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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

Received: 23 October 2020

ZTFLH:

TG174

Fund: Basic Scientific Research Service Fee of Central University of Civil Aviation University of China(3122019107)

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

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

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Cite this article:

DING Qingmiao, GAO Yuning, HOU Wenliang, QIN Yongxiang. 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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.207 OR https://www.jcscp.org/EN/Y2021/V41/I5/705

Fig.1 Three-dimensional physical model (a) and two-dimensional physical model (b) of reinforced concrete

Fig.2 Reinforced concrete meshing model: (a) coarser, (b) coarse, (c) normal, (d) fine

Table 1 Statistics of grid division results

Fig.3 Cl^- concentration around steel bars

Fig.4 Schematic diagram of current flow of micro-element

Fig.5 Cl^- distribution cloud map in reinforced concrete at 100 d (a), 300 d (b), 500 d (c), 700 d (d) and 1000 d (e)

Fig.6 Chloride ion concentration changes with diffusion depth

Fig.7 Chamges of chloride ion concentration (a) and corrosion depth (b) on the surface of steel bars

Fig.8 Chloride ion distribution cloud diagram in reinforced concrete with 100 mol/m³ (a), 200 mol/m³ (b), 300 mol/m³ (c), 400 mol/m³ (d), 500 mol/m³ (e) and 600 mol/m³ (f) chloride ion concentrationat 1000 d

Fig.9 Relationship between chloride ion concentration and time at the highest point of steel bars

Fig.10 Chamges rebar deactivation time (a) and electrode potential (b) with chloride ion concentration

Fig.11 Effect of chloride ion concentration on the corrosion depth of steel bars

Fig.12 Corrosion depth of the steel bar surface with 100 mol/m³ (a), 200 mol/m³ (b), 300 mol/m³ (c), 400 mol/m³ (d), 500 mol/m³ (e) and 600 mol/m³ (f) chloride ion concentration in the environment at 1000 d

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