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浙江大学学报(工学版)
土木工程     
双向电渗对钢筋混凝土修复效果的试验研究——保护层阻锈剂、氯离子和总碱度的变化规律
金伟良1,2,黄楠1,许晨1 ,毛江鸿2
1.浙江大学 结构工程研究所,浙江 杭州 310058;2.浙江大学 宁波理工学院,浙江 宁波 315100
Experimental research on effect of bidirectional electromigration rehabilitation on reinforced concrete—Concentration changes of inhibitor, chloride ions and total alkalinity
JIN Wei-liang1,2, HUANG Nan1, XU Chen1, MAO Jiang-hong2
 1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China; 2. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
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摘要:

为提高氯盐侵蚀环境下钢筋混凝土结构的无损修复效果,对受氯盐侵蚀的钢筋混凝土试件采用双向电渗技术,在排出氯离子的同时向混凝土保护层内引入阻锈剂.为考察该技术的修复效果,采用有机元素分析法和自动电位滴定法,结合电流密度、通电时间、水灰比、初始氯盐掺量4个影响因素,研究混凝土保护层内阻锈剂、氯离子分布的变化情况,并对保护层的总碱度进行测量;同时设置电化学除氯组作为对照.结果表明:双向电渗处理后试件保护层内氯离子含量降低,总碱度提高;通过对各参数的合理控制,阻锈剂迁移至钢筋表面的浓度足以起到较好的阻锈效果.双向电渗的效果随电流密度、通电时间、试件水灰比的增加而提高,而受初始氯盐掺量的影响较小.双向电渗在对混凝土氯离子迁出和总碱度提高的效果方面与电化学除氯有所差异.在双向电渗后,Cl-质量摩尔浓度沿着保护层厚度方向由内向外成增高趋势;而电化学除氯后整个保护层内Cl-质量摩尔浓度分布相对均匀.对保护层碱度变化来说,两种处理方式效果接近.

Abstract:

An amine-based corrosion inhibitor for steel in aqueous media was introduced into reinforced concrete specimens mixed with chloride through a novel method called bidirectional electro-migration rehabilitation (BIEM) in order to improve the remediation effect on chloride-contaminated reinforced concrete structures without damage. An electrical field was applied between embedded steel cathode and external anode to inject the corrosion inhibitor from external electrolyte and extract the chloride ions from the concrete cover zone. Considering the applied current density, duration of electrolysis, water/cement ratio and initial chloride content, the concentration profiles of the corrosion inhibitor and the chloride ions as well as the profiles of total alkalinity within the concrete were determined to evaluate the effectiveness of BIEM by means of organic elemental analyzer and automatic potentiometric titrator. Electrochemical chloride extraction (ECE) was applied to similar concrete surfaces as control experiments. It was found that chloride content decreased and alkalinity increased after the treatment. The inhibitor concentration around the embedded steel was adequate to provide corrosion protection under proper conditions. The effectiveness of BIEM increased as current density and/or treatment duration and/or water/cement ratio increased. However, the initial chloride content within concrete had little effect on the efficiency of the electrolysis. Results also showed that ECE and BIEM had different influences on chloride extraction and alkalinity increase. After BIEM treatment, chloride distribution appears increasing trend from inside to outside of concrete cover; but for ECE treatment, chloride content is in uniform distribution.However,the total alkalinity seems similar after BIEM and ECE treatment.

出版日期: 2014-09-01
:  TU 375  
基金资助:

国家自然科学基金重大国际合作资助项目(50920105806);杭州市科技计划资助项目(20130533B18);质检总局公益性科研资助项目(201210229-2);科研发展专项资助项目(2014FZA4018);浙江省自然科学基金资助项目(LQ14E080010)

通讯作者: 许晨,男,助理研究员,博士     E-mail: zju_xuchen@zju.edu.cn
作者简介: 金伟良,男(1961-),教授,博导,从事混凝土结构耐久性研究.E-mail: jinwl@zju.edu.cn
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引用本文:

金伟良,黄楠,许晨,毛江鸿. 双向电渗对钢筋混凝土修复效果的试验研究——保护层阻锈剂、氯离子和总碱度的变化规律[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2014.09.007.

JIN Wei-liang, HUANG Nan, XU Chen, MAO Jiang-hong. Experimental research on effect of bidirectional electromigration rehabilitation on reinforced concrete—Concentration changes of inhibitor, chloride ions and total alkalinity. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2014.09.007.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2014.09.007        http://www.zjujournals.com/eng/CN/Y2014/V48/I9/1586

[1] MEHTA P K, BURROWS R W. Building durable structures in the 21st century [J]. Concrete International, 2001, 23(3): 57-63.
[2] 金伟良,赵羽习. 混凝土结构耐久性 [M]. 北京: 科学出版社, 2002:510.
[3] 金伟良. 腐蚀混凝土结构学 [M]. 北京: 科学出版社, 2011:12-14.
[4] SONG H, ANN K Y, PACK S, et al. Factors influencing chloride transport and chloride threshold level for the prediction of service life of concrete structures [J]. International Journal of Structural Engineering, 2010, 1(2): 131-144.
[5] MARTNEZ I, ANDRADE C, CASTELLOTE M, et al. Advancements in non-destructive control of efficiency of electrochemical repair techniques [J]. Corrosion Engineering, Science and Technology, 2009, 44(2): 108-118.
[6] FAJARDO G, ESCADEILLAS G, ARLIGUIE G. Electrochemical chloride extraction (ECE) from steel-reinforced concrete specimens contaminated by “artificial” sea-water [J]. Corrosion Science, 2006, 48(1): 110-125.
[7] MIRANDA J M, GONZLEZ J A, COBO A, et al. Several questions about electrochemical rehabilitation methods for reinforced concrete structures [J]. Corrosion Science, 2006, 48(8): 2172-2188.
[8] YEIH W, CHANG J J, HUNG C C. Selecting an adequate procedure for the electrochemical chloride removal [J]. Cement and Concrete Research, 2006, 36(3): 562-570.
[9] MORRIS W, VICO A, VAZQUEZ M. The performance of a migrating corrosion inhibitor suitable for reinforced concrete [J]. Journal of Applied Electrochemistry, 2003, 33(12): 1183-1189.
[10] 刘志勇,缪昌文,周伟玲,等. 迁移性阻锈剂对混凝土结构耐久性的保持和提升作用 [J]. 硅酸盐学报,2008, 36(10): 1494-1500.
LIU Zhi-yong, MIAO Chang-wen, ZHOU Wei-ling, et al. Maintenance and improvement of durability of reinforced concrete using migrating corrosion inhibitor [J]. Journal of the Chinese Ceramic Society, 2008, 36(10): 1494-1500.
[11] NMAI C K. Multi-functional organic corrosion inhibitor [J]. Cement and Concrete Composites, 2004, 26(3): 199-207.
[12] ORMELLESE M, BOLZONI F, LAZZARI L, et al. Organic substances as inhibitors for chloride‐induced corrosion in reinforced concrete [J]. Materials and Corrosion, 2011, 62(2): 170-177.
[13] MONTEMOR M F, SIMOES A, FERREIRA M. Chloride-induced corrosion on reinforcing steel: from the fundamentals to the monitoring techniques [J]. Cement and Concrete Composites, 2003, 25(4): 491-502.
[14] BOLZONI F, GOIDANICH S, LAZZARI L, et al. Corrosion inhibitors in reinforced concrete structures Part 2–Repair system [J]. Corrosion Engineering, Science and Technology, 2006, 41(3): 212-220.
[15] SAWADA S, PAGE C L, PAGE M M. Electrochemical injection of organic corrosion inhibitors into concrete [J]. Corrosion Science, 2005, 47(8): 2063-2078.
[16] SAWADA S, KUBO J, PAGE C L, et al. Electrochemical injection of organic corrosion inhibitors into carbonated cementitious materials: Part 1. Effects on pore solution chemistry [J]. Corrosion Science, 2007, 49(3): 1186-1204.
[17] KUBO J, SAWADA S, PAGE C L, et al. Electrochemical inhibitor injection for control of reinforcement corrosion in carbonated concrete [J]. Materials and Corrosion, 2008, 59(2): 107-114.
[18] 章思颖. 应用于双向电渗技术的电迁移型阻锈剂的筛选 [D]. 杭州: 浙江大学, 2012.
ZHANG Si-ying. A study of corrosion inhibitors for bidirectional electromigration rehabilitation [D]. Hangzhou: Zhejiang University, 2012.
[19] 章思颖,金伟良,许晨. 混凝土中胺类有机物-胍对钢筋氯盐腐蚀的作用 [J]. 浙江大学学报:工学版, 2013, 47(3): 449-455.
ZHANG Si-ying, JIN Wei-liang, XU Chen. Effectiveness of an amine-based inhibitor - guanidine for steel in chloride-contaminated simulated concrete pore solutions [J]. Journal of Zhejiang University:Engineering Science, 2013, 47(3):449-445.
[20] LI L Y, PAGE C L. Finite element modelling of chloride removal from concrete by an electrochemical method [J]. Corrosion Science, 2000, 42(12): 2145-2165.
[21] EYDELNANT A, MIKSIC B, GELNER L. Migrating corrosion inhibitors for reinforced concrete [J]. ConChem Journal, 1993(2): 38.
[22] ELSENER B, BUCHLER M, STALDER F, et al. Migrating corrosion inhibitor blend for reinforced concrete: part 1-prevention of corrosion [J]. Corrosion, 1999, 55(12): 1155-1163.
[23] MAMMOLITI L T, BROWN L C, HANSSON C M, et al. The influence of surface finish of reinforcing steel and pH of the test solution on the chloride threshold concentration for corrosion initiation in synthetic pore solutions [J]. Cement and Concrete Research, 1996, 26(4): 545-550.
[24] CASTELLOTE M, ANDRADE C, ALONSO C. Electrochemical removal of chlorides: modelling of the extraction, resulting profiles and determination of the efficient time of treatment [J]. Cement and Concrete Research, 2000, 30(4): 615-621.
[25] CHATTERJI S. On the applicability of Ficks second law to chloride ion migration through Portland cement concrete [J]. Cement and Concrete Research, 1995, 25(2): 299-303.
[26] COSTA A, APPLETON J. Chloride penetration into concrete in marine environment—Part I: Main parameters affecting chloride penetration [J]. Materials and Structures, 1999, 32(4): 252-259.

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