混凝土内通电锈蚀钢筋锈蚀率计算
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摘要
钢筋锈蚀是引起混凝土结构耐久性问题的首要原因,钢筋锈蚀不仅导致自身截面损失,力学性能降低,同时引起混凝土开裂和降低与混凝土的黏结强度。为在较短期限内获得大量锈蚀钢筋试件,国内外学者多采用通电加速锈蚀方法。文中,研究氯离子侵蚀下的混凝土试块内钢筋的通电加速锈蚀问题,在运用Fick定律计算获得钢筋起锈时间的前提下,基于Faraday电解定律,推导并获得了钢筋锈蚀率的计算公式,并最终得到试验验证。研究结论和试验方法可为通电加速试验在实验室中的运用提供参考依据。
The steel bar corrosion is the leading cause of durability problems of concrete structure, Corrosion of steel bar causes loss of its own section, reduces mechanical property, and causes concrete cracking and reducing bond strength with concrete. In order to obtain a large number of corroded steels in a short period, the anodic current method to accelerate the corrosion of steel has been usually used by the domestic and foreign scholars. In this paper, we studied steel bar corrosion caused by the applied anodic current in concrete blocks under the chloride erosion environment, calculated corrosion initial time of steel bar by the use of Fick's law, and then deduced the calculation formula of corrosion rate based on Faraday's law and verified by the experiments. The research conclusions and test method provide a reference for the application of anodic current method to accelerate the steel corrosion in the laboratory.
The steel bar corrosion is the leading cause of durability problems of concrete structure, Corrosion of steel bar causes loss of its own section, reduces mechanical property, and causes concrete cracking and reducing bond strength with concrete. In order to obtain a large number of corroded steels in a short period, the anodic current method to accelerate the corrosion of steel has been usually used by the domestic and foreign scholars. In this paper, we studied steel bar corrosion caused by the applied anodic current in concrete blocks under the chloride erosion environment, calculated corrosion initial time of steel bar by the use of Fick's law, and then deduced the calculation formula of corrosion rate based on Faraday's law and verified by the experiments. The research conclusions and test method provide a reference for the application of anodic current method to accelerate the steel corrosion in the laboratory.
引文
[1]吴胜兴.钢筋混凝土结构锈裂损伤研究综述[J].工程力学,2002(S):70-88.WU Sheng-xing.Review on corrosion damage of reinforced concrete structure[J].Engineering Mechanics,2002(S):70-88.
[2]张誉,蒋利学,张伟平,等.混凝土结构耐久性概论[M].上海:上海科学技术出版社,2003.ZHANG Yu,JIANG Li-xue,ZHANG Wei-ping,et al.Introduction to concrete structure durability[M].Shanghai:Shanghai Scientific&Technical Publishers,2003.
[3]宋晓冰.钢筋混凝土结构中的钢筋腐蚀[D].北京:清华大学,1999.SONG Xiao-bing.Steel corrosion in reinforced concrete structure[D].Beijing:Tsinghua University,1999.
[4]汉斯·博尼.钢筋混凝土结构的腐蚀[M].北京:机械工业出版社,2009.BOHNI H.Corrosion in reinforced concrete structures[M].Beijing:China Machine Press,2009.
[5]徐港,卫军,刘红庆.钢筋非均匀锈蚀试验研究[J].华中科技大学学报:自然科学版,2006,34(5):111-114.XU Gang,WEI Jun,LIU Hong-qing.The experimental study of the non-uniform corrosion of steel bars[J].J.Huazhong Univ.of Sci.&Tech.:Nature Science Edition,2006,34(5):111-114.
[6]WEBER W J,MC-GINLEY P M,KATZ L E.The nature and effects of sorption processes in subsurface systems[M]//BEAR J,CORAPCIOGLU M Y.Transport processes in porous media.NATO ASI Series E:Applied Sciences,Vol.202.Kluwer,Dordrecht,The Netherlands,1991:543-582.
[7]ATKINS P W.Physical chemistry[M].5th ed.Oxford,U.K.:Oxford University Press,1994.
[8]TANG L,NILSSON L O.Rapid determination of the chloride diffusivity in concrete by applying an electrical field[J].American Journal of Geriatric Psychiatry,1992,10(1):24-35.
[9]杨绮琴,方北龙,童叶翔.应用电化学[M].2版.广州:中山大学出版社,2005.YANG Qi-qin,FANG Bei-long,TONG Ye-xiang.Applied electrochemistry[M].2nd ed.Guangzhou:Sun Yat-Sen University Press,2005.
[10]BAWEJA D,ROPER H,SIRIVIVATNANON V.Improved electrochemical determinations of chloride-induced steel corrosion in concrete[J].ACI Materials Journal,2003,100(3):228-238.
[11]王腾.钢筋混凝土T形梁的耐侵蚀构造研究[D].长沙:中南大学,2010.WANG Teng.Research on corrosion resistance structures of reinforced concrete T-beam[D].Changsha:Central South University,2010.
[2]张誉,蒋利学,张伟平,等.混凝土结构耐久性概论[M].上海:上海科学技术出版社,2003.ZHANG Yu,JIANG Li-xue,ZHANG Wei-ping,et al.Introduction to concrete structure durability[M].Shanghai:Shanghai Scientific&Technical Publishers,2003.
[3]宋晓冰.钢筋混凝土结构中的钢筋腐蚀[D].北京:清华大学,1999.SONG Xiao-bing.Steel corrosion in reinforced concrete structure[D].Beijing:Tsinghua University,1999.
[4]汉斯·博尼.钢筋混凝土结构的腐蚀[M].北京:机械工业出版社,2009.BOHNI H.Corrosion in reinforced concrete structures[M].Beijing:China Machine Press,2009.
[5]徐港,卫军,刘红庆.钢筋非均匀锈蚀试验研究[J].华中科技大学学报:自然科学版,2006,34(5):111-114.XU Gang,WEI Jun,LIU Hong-qing.The experimental study of the non-uniform corrosion of steel bars[J].J.Huazhong Univ.of Sci.&Tech.:Nature Science Edition,2006,34(5):111-114.
[6]WEBER W J,MC-GINLEY P M,KATZ L E.The nature and effects of sorption processes in subsurface systems[M]//BEAR J,CORAPCIOGLU M Y.Transport processes in porous media.NATO ASI Series E:Applied Sciences,Vol.202.Kluwer,Dordrecht,The Netherlands,1991:543-582.
[7]ATKINS P W.Physical chemistry[M].5th ed.Oxford,U.K.:Oxford University Press,1994.
[8]TANG L,NILSSON L O.Rapid determination of the chloride diffusivity in concrete by applying an electrical field[J].American Journal of Geriatric Psychiatry,1992,10(1):24-35.
[9]杨绮琴,方北龙,童叶翔.应用电化学[M].2版.广州:中山大学出版社,2005.YANG Qi-qin,FANG Bei-long,TONG Ye-xiang.Applied electrochemistry[M].2nd ed.Guangzhou:Sun Yat-Sen University Press,2005.
[10]BAWEJA D,ROPER H,SIRIVIVATNANON V.Improved electrochemical determinations of chloride-induced steel corrosion in concrete[J].ACI Materials Journal,2003,100(3):228-238.
[11]王腾.钢筋混凝土T形梁的耐侵蚀构造研究[D].长沙:中南大学,2010.WANG Teng.Research on corrosion resistance structures of reinforced concrete T-beam[D].Changsha:Central South University,2010.