氯离子侵蚀下异类钢筋的腐蚀行为
Corrosion Behavior of Different Bars in Chloride Ion Corrosion
摘 要
为了比较钢筋混凝土结构中光圆钢筋与带肋钢筋在腐蚀过程中的差异，以氯离子侵蚀为脱钝机制，根据相关腐蚀电化学原理，使用有限元软件COMSOL MULTIPHYSICS进行模拟；模型不但耦合了基于电化学、氯离子、温度和水分的多物理场，还对钢筋的去钝化行为和腐蚀速率进行了分析。结果表明: 同种工况下、同种规格的两种钢筋中，带肋钢筋的去钝化时间更短，优先腐蚀且腐蚀速率比光圆钢筋更大；横肋最大宽度和间距的减小都将导致钢筋腐蚀速率的增加。
带肋钢筋
去钝化
电化学
腐蚀
plain round bar
deformed bar
depassivation
electrochemistry
corrosion
Abstract
In order to compare the difference of corrosion process between plain round bars and deformed bars which are used in reinforced concrete structure, for the corrosion caused by chloride ion with a depassivation mechanism, simulated was performed using FEM simulation software COMSOL MULTIPHYSICS according to the principle of corrosion electrochemistry. The model not only coupled multiphysics based on electrochemistry, chloride ion, temperature and humidity, but also analyzed the depassivation behavior and corrosion rate of the bars. The results showed that under the same working condition and with the same dimension, compared with plain round, deformed bars had shorter depassivation time, faster corrosion rate, and corroded easily. The decrease of maximum width and distance of transverse ribs increased the corrosion rate.
中图分类号 TG174.4 DOI 10.11973/fsyfh-201605013
所属栏目 试验研究
基金项目 山东省自然科学基金(ZR2012EEL23); 中央高校基本科研业务费专项资金(15CX05004A)
收稿日期 2015/3/19
修改稿日期
网络出版日期
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备注程旭东(1971-)，教授，博士，从事土木工程、油田地面工程结构及LNG储罐方面的教学及科研工作
引用该论文: CHENG Xu-dong,XU Li,FAN Yan-ping,LI Xiao-nan,PANG Ming-wei,XU Feng. Corrosion Behavior of Different Bars in Chloride Ion Corrosion[J]. Corrosion & Protection, 2016, 37(5): 407
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参考文献
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【17】GB 1499.2-2007 钢筋混凝土用钢第2部分: 热轧带肋钢筋[S].
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【2】蔡荣,杨绿峰,余波. 海洋潮汐浪溅区混凝土表面氯离子浓度计算模型[J]. 海洋工程,2014,32(5): 25-33.
【3】CAO C,CHEUNG M. Non-uniform rust expansion for chloride-induced pitting corrosion in RC structures[J]. Construction and Building Materials,2014(51): 75-81.
【4】林刚. 混凝土中钢筋腐蚀的数值模拟[J]. 建材技术与应用,2010(11): 6-9.
【5】余波,毋铭,杨绿峰. 混凝土保护层对钢筋腐蚀机理及腐蚀速率的影响[J]. 工业建筑,2014,44(7): 112-119.
【6】JI Y,ZHAO W,ZHOU M,et al. Corrosion current distribution of macrocell and microcell of steel bar in concrete exposed to chloride environments[J]. Construction and Building Materials,2013(47): 104-110.
【7】赵尚传,付智,国天逵. 氯离子临界浓度研究现状与进展[C]//第七届全国混凝土耐久性学术交流会论文集. ［出版地不详］: ［出版者不详］，2009(7): 128-131.
【8】ANGST U,ELSENER B,LARSEN C K,et al. Chloride induced reinforcement corrosion: rate limiting step of early pitting corrosion[J]. Electrochimica Acta,2011,56(17): 5877-5889.
【9】XI Y,BAZANT Z P,JENNINGS H H. Moisture diffusion in cementitious materials adsorption isotherms[J]. Advanced Cement Based Materials,1994,1(6): 248-257.
【10】刘俊龙,余红发,孙伟,等. 混凝土氯离子结合能力的影响因素规律性研究[J]. 硅酸盐通报,2011,30(1): 172-176.
【11】ANGST U,ELSENER B,LARSEN C K,et al. Critical chloride content in reinforced concrete-a review[J]. Cement and Concrete Research,2009,39(12): 1122-1138.
【12】ALONSO C,CASTELLOTE M,ANDRADE C. Chloride threshold dependence of pitting potential of reinforcements[J]. Electrochimica Acta,2002,47(21): 3469-3481.
【13】CAO C,CHEUNG M,CHAN B Y B. Modelling of interaction between corrosion-induced concrete cover crack and steel corrosion rate[J]. Corrosion Science,2013(69): 97-109.
【14】刘启蛟,刘宏新,彭蕙蕙. 青岛海湾大桥混凝土耐久性设计方案研究[J]. 山东交通科技,2008(2): 55-57.
【15】徐港,徐可,苏义彪,等. 不同干湿制度下氯离子在混凝土中的传输特性[J]. 建筑材料学报,2014,17(1): 54-59.
【16】GB 1499.1-2008 钢筋混凝土用钢第1部分: 热轧光圆钢筋[S].
【17】GB 1499.2-2007 钢筋混凝土用钢第2部分: 热轧带肋钢筋[S].
【18】CRETE D. General guidelines for durability design and redesign[R]//The European Union-Brite Eu Ram III,Project No. BE95-1347: ‘Probabilistic Performance Based Durability Design of Concrete Structures’,Document,2000: 15.
【19】CAO C. 3D simulation of localized steel corrosion in chloride contaminated reinforced concrete[J]. Construction and Building Materials,2014(72): 434-443.
【20】MOHAMMED T U,OTSUKI N,HISADA M,et al. Effect of crack width and bar types on corrosion of steel in concrete[J]. Journal of Materials in Civil Engineering,2001,13(3): 194-201.
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