碳化混凝土再碱化过程中钢筋在Ca(OH)2溶液中的电极过程
Electrode Process of Rebar in Ca(OH)2 Solution during Realkalization of Carbonated Concrete
摘 要
研究了碳化混凝土再碱化过程中钢筋在Ca(OH)2溶液中的电极表面电化学反应,采用电化学测量技术结合模拟试验考察了电极表面发生各类反应的可能性.结果表明:再碱化过程中,钢筋电极表面的电化学反应与钢筋表面的状态有密切关系,当电极表面存在锈蚀层时,再碱化过程析氢反应和氧化铁的还原同时发生,并使表面氧化层的价态逐渐降低,在电极表面形成金属铁,析氢过程产生的OH-使钢筋周围混凝土的碱性提高.
再碱化
碳化混凝土
钢筋
electrode process
realkalization
carbonated concrete
rebar
Abstract
The electrochemical reactions on the rebar during realkalization treatment of carbonated concrete were investigated by using simulation test and electrochemical measurement.The coulomb and the volume of H2 were measured during realkalization treatment,and the electrochemical characteristics of the rebar electrode before and after treatment were compared.The electrode process during the realkalization treatment was discussed according to the experimental results.Results show that the electrochemical reaction on the rebar is closely related with the surface state of rebar electrode.During realkalization treatment,the reduction of ferric oxide or ferrous oxide formed on the surface of rebar will occur in company with the H2 evolution.The realkalization treatment not only resumes the basicity of the carbonated concrete,but also rehabilitates the corroded rebar by reducing the rust to iron.
中图分类号 TG172.6+3,TG174.3+6
所属栏目 试验研究
基金项目 国家自然科学基金(50771602,50678127),上海市重点学科建设基金(P1304)项目资助
收稿日期 2007/9/6
修改稿日期 2007/9/30
网络出版日期
作者单位点击查看
引用该论文: ZHANG Jun-xi,YANG Ji,ZHANG Ling-song,XIONG Yan,QU Wen-jun,YAN Li-cheng. Electrode Process of Rebar in Ca(OH)2 Solution during Realkalization of Carbonated Concrete[J]. Corrosion & Protection, 2008, 29(9): 507～509
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参考文献
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【12】朱鹏,屈文俊.碳化混凝土再碱化控制理论研究的探讨[J].材料导报,2006,20(3):125-132.
【2】Velibasakis E E,Henriksen S K,Whirmore D W.Chloride extraction and realkalization of reinforced concrete stop steel corrosion[J].J Performance of Constructed Facilities,1998(5):77-84.
【3】Fedrizzi L,Azzolini F,Bonora P L.The use of migrating corrosion inhibitors to repair motorwaysconcrete structures contaminated by chlorides[J].Cement Concrete Res,2005,35(3):551-564.
【4】Gonzalez J A,Cobo A,Gonzalez M N.On the effectiveness of realkalization as a rehabilitation method for corroded reinforced concrete structures[J].Mater.& Corr.,2000,51:97-103.
【5】Siegwart M,Lyness J F,McFarland B J.The effect of electrochemical chloride extraction on pre-stressed concrete[J].Constru Building Mater,2005,19(8):585.
【6】Kawamata K.Electrochemical corrosion control method for concrete structure[J].Corrosion Eng,2004,53(9):426-429.
【7】Andrade C,Castellote M,Sarria J.Evolution of pore solution chemistry,electro-osmosis and rebar corrosion rate induced by realkalisation[J].Mater Struct,1999,32:427-436.
【8】朱雅仙.碳化混凝土再碱化技术的研究[J].水运工程,2001(6):12-15.
【9】Yeih W,Chang J J.A study on the efficiency of electrochemical realkalisation of carbonated concrete[J].Constru Building Mater,2005,19:516-524.
【10】刘可高,朱慧.火灾损伤钢筋混凝土电化学再碱化技术的研究[J].建筑技术开发,2004,31(12):44-47.
【11】屈文俊,陈璐,刘于飞.碳化混凝土再碱化的维修技术[J].建筑结构,2001,31(9):35-41.
【12】朱鹏,屈文俊.碳化混凝土再碱化控制理论研究的探讨[J].材料导报,2006,20(3):125-132.
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