Numerical Simulation of Chloride Ion Induced Corrosion of Reinforced Concrete Structures in Marine Environment

doi:10.11902/1005.4537.2014.146

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (2): 144-150 DOI: 10.11902/1005.4537.2014.146

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Numerical Simulation of Chloride Ion Induced Corrosion of Reinforced Concrete Structures in Marine Environment

CHENG Xudong¹(

), SUN Lianfang¹, CAO Zhifeng¹, ZHU Xingji², ZHAO Lixin³

1. College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China
2. Department of Civil, Environmental & Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea
3. Jingding Engineering & Construction Co., Ltd., Beijing 100011, China

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Abstract

A numerical simulation method of chloride ion induced corrosion was proposed. Based on the different corrosion mechanisms of submersion zone, tidal zone, splash zone and atmosphere zone, a series of theoretical equations were built by taking into account the effect of temperature, humidity, concrete age, chloride ion concentration and seawater convection etc. Further,a numerical simulation program was developed to simulate the service status of a bridge pier of Qingdao bay bridge by means of COMSOL coupled with factors such as temperature, humidity and chloride ion transmission etc. The results show that: (1) the numerical method can simulate chloride ion induced corrosion well; (2) the place where depassivation occurred for the reinforced steel bar corresponds to submersion zone, tidal zone, tidal zone and atmosphere zone in turn; (3) for this living example, the first depassivation of reinforced steel bars for a bare reinforced concrete bridge pier may occur in the place about -2.200 m (near to the center of tidal range zone) after in service for 25 a.

Key words: numerical simulation of corrosion chloride ion erosion COMSOL depassivation of steel bar reinforced concrete bridge pier

Received: 09 September 2014

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	Xudong CHENG
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	Lixin ZHAO

Cite this article:

CHENG Xudong, SUN Lianfang, CAO Zhifeng, ZHU Xingji, ZHAO Lixin. Numerical Simulation of Chloride Ion Induced Corrosion of Reinforced Concrete Structures in Marine Environment. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 144-150.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.146 OR https://www.jcscp.org/EN/Y2015/V35/I2/144

Table 1 Concrete zone partition

Fig.1 Bridge pier cross-section diagram (mm) (a) and bridge pier zone partition diagram (m) (b)

Table 2 Numerical calculation related parameters

Fig.2 Changing curves of chloride ion concentration on the rebar surface with height in tidal zone (a) and splash zone (b)

Fig.3 Changing curves of chloride ion concentration with depth in submersion zone (-3.660 m) (a), tidal zone (-2.200 m) (b), splash zone (-0.990 m) (c) and atmosphere zone (6.410 m) (d)

Fig.4 Chloride ion concentrations on the rebar surface as a function of time in four zones

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