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中国腐蚀与防护学报  2015, Vol. 35 Issue (2): 144-150    DOI: 10.11902/1005.4537.2014.146
  本期目录 | 过刊浏览 |
沿海钢筋混凝土结构Cl-侵蚀数值模拟方法研究
程旭东1(), 孙连方1, 曹志烽1, 朱兴吉2, 赵立新3
1. 中国石油大学 (华东) 储运与建筑工程学院 青岛 266580
2. 韩国高丽大学土木、环境与建筑工程系 首尔 136-701
3. 京鼎工程建设有限公司 北京 100011
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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摘要: 

提出了一种Cl-侵蚀的数值模拟方法。针对结构所处的水下区、潮差区、浪溅区和大气区不同的侵蚀机理,考虑温度、相对湿度、混凝土龄期、结合Cl-及对流影响,参考国内外研究成果建立相应的理论公式；以COMSOL为基础,将温度、湿度和Cl-运输进行多场耦合,开发出数值模拟程序,并对青岛海湾大桥某桥墩的Cl-侵蚀情况进行数值模拟。结果表明：该数值方法可以很好地模拟沿海混凝土结构Cl-侵蚀；钢筋去钝化依次出现在潮差区、浪溅区、水下区和大气区；对本实例,如不做特殊防护,钢筋去钝化最先开始的位置约为高程-2.200 m处 (潮差区中心位置附近),该处钢筋去钝化时间约为25 a。
关键词 ： 腐蚀数值模拟,  Cl-侵蚀,  COMSOL,  钢筋去钝化,  钢筋混凝土桥墩    
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
收稿日期: 2014-09-09     
ZTFLH:  TU375  
基金资助:山东省自然科学基金项目(ZR2012EEL23) 资助
作者简介: null

程旭东，男，1971年生，博士，教授
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程旭东
孙连方
曹志烽
朱兴吉
赵立新

引用本文:

程旭东, 孙连方, 曹志烽, 朱兴吉, 赵立新. 沿海钢筋混凝土结构Cl-侵蚀数值模拟方法研究[J]. 中国腐蚀与防护学报, 2015, 35(2): 144-150.
Xudong CHENG, Lianfang SUN, Zhifeng CAO, Xingji ZHU, Lixin ZHAO. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.146      或      https://www.jcscp.org/CN/Y2015/V35/I2/144

Atmosphere zone Splash zone Tidal zone Submersion zone
Above design high water level plus
(η0 +1.0 m) 		Between the atmosphere zone lower bound and design high water level minus η0 Between the splash zone lower bound and design low water level minus 1.0 m Under the tidal zone
Above 5.91 m -0.99~5.91 m -0.99~-3.16 m Under -3.16 m
表1  混凝土区域划分
图1  桥墩截面示意图和桥墩区域划分示意图
Parameter name Value
Initial temperature T0/K 285.35
Initial pore relative humidity h0 0.73
Initial free chloride ion concentration Cc0 / kgm-3 0
The highest temperature in submersion zone Tmax1/K 294.65
The lowest temperature in submersion zone Tmin1/K 280.65
The highest temperature in other zones Tmax2/K 298.65
The lowest temperature in other zones Tmin2/K 271.95
The maximum environmental relative humidity hmax1 0.89
The minimum environmental relative humidity hmin1 0.68
The surface concentration of chloride ion in submersion zone Cc1 / kgm-3 21.94
The surface concentration of chloride ion in atmosphere zone Cc2 / kgm-3 5.47
表2  数值计算相关参数
图2  潮差区和浪溅区不同时刻钢筋外表面处沿高度方向的Cl-浓度变化曲线
图3  4个区域不同时刻沿深度方向的Cl-浓度变化曲线
图4  4个区域钢筋外表面的Cl-浓度随时间的变化曲线
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