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http://dx.doi.org/10.11112/jksmi.2013.17.5.067

The Inhibitive Effect of Electrochemical Treatment Applied to Fresh/hardened Concrete  

Kim, Sung-Wook (한국건설기술연구원)
Moon, Jae-Heum (한국건설기술연구원)
Ann, Ki-Yong (한양대학교 건설환경공학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.17, no.5, 2013 , pp. 67-76 More about this Journal
Abstract
In this study, the inhibitive effect of electrochemical treatment subjected to fresh and hardened concrete and literature reviews in terms of the treatment were performed. In hardened concrete, chloride ions are mixed during casting to destroy the passivity of steel, and then the current was provided for 2 weeks with 250, 500 and $750mA/m^2$. After completion of electrochemical treatment, the extraction of chloride ions was quantified and repassivation of steel was observed. Simultaneously, the equated levels of current density for 2 weeks were applied to fresh concrete. Steel-concrete interface in concrete was observed by BSE image analysis and the concrete properties in terms of the diffusivity of chloride ions and the resistance of steel corrosion was measured. As the result, electrochemical treatment is very effectiveness to rehabilitate the passive film on the steel surface and 63-73% of chloride ions in concrete were extracted by the treatment. As the treatment was applied to fresh concrete, the resistance of steel corrosion was improved due to the densification of $Ca(OH)_2$ layers in the vicinity of steel. However, an increase in the current density resulted in an increase in surface chloride content of concrete.
Keywords
Electrochemical treatment; Steel corrosion; Chloride ions; BSE image analysis; Concrete; $Ca(OH)_2$;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Sergi, G., Walker, R. J. and Page, C. L., "Mechanisms and criteria for the realkalisation of concrete", In: Corrosion of Reinforcement in Concrete Construction, C. L. Page, P. B. Bamforth and J. W. Figg, eds., Cambridge UK, 1996, pp.491-500.
2 Slater, J. E., Lankard, D. R. and Moreland, P. L., "Electrochemical removal of chlorides from concrete bridge decks", Transport Research Record, No. 604, 1976, pp.6-15.
3 Song, H. W., Lee, C. H., Lee, K. C., "A study on chloride binding capacity of various blended concretes at early age", Journalr of the Korea Institute for Structural Maintenance and Inspection, Vol. 12, No. 5, 2008, pp.133-142 (in Korean, with English abstract).   과학기술학회마을
4 Tritthart, J., "Electrochemical chloride removal - A case study and laboratory tests", In: Corrosion of Reinforcement in Concrete Construction, C. L. Page, P. B. Bamforth and J. W. Figg, eds., Cambridge UK, 1996, p.447.
5 Vrable, J. B., "Cathodic protection for reinforcing steel in concrete", In: Chloride Corrosion of Steel in Concrete, ASTM STP 629, 1975, pp.124-149.
6 Ann, K. Y., Enhancing the chloride threshold level for steel corrosion in concrete, Unpublished Ph.D. diss, Imperial College, Department of Civil and Environmental Engineering, 2005.
7 Arya, C., Said-Shawqi, Q. and Vassie, P. R. W., "Factors influencing electrochemical removal of chloride from concrete", Cement and Concrete Research, Vol. 26, No. 6, 1996, pp.851-860.   DOI   ScienceOn
8 Broomfield, J. P., Langfor, P. E. and Mcanoy, R., "Cathodic protection for reinforced concrete: its application to buildings and marine structures", Corrosion of Metals in Concrete, NACE, Houston USA, April, 1987.
9 Hassanein, A. M., Glass, G. K. and Buenfeld, N. R., "Effect of intermittent cathodic protection on chloride and hydroxyl concentration profile in reinforced concrete", British Corrosion Journal, Vol. 34, No. 4, 1999, pp.254-261.   DOI   ScienceOn
10 Jung, M. S., Shin, M. C. and Ann, K. Y., "Fingerprinting of a concrete mix proportion using the acid neutralisation capacity of cement matrices", Construction and Building Materials, Vol. 26, No. 1, 2012, pp.65-71.   DOI   ScienceOn
11 Marcotte, T. D., Hansson, C. M. and Hope, B. B., "The effect of the electrochemical chloride extraction treatment on steel-reinforced mortar Part I: Electrochemical measurements", Cement and Concrete Research, Vol. 29, No. 10, 1999a, pp.1555-1560.   DOI   ScienceOn
12 Mattila, J. S., Pentti, M. J. and Raiski, T. A., "Durability of electrochemical realkalised concrete structures", In: Corrosion of Reinforcement in Concrete Construction, C. L. Page, P. B. Bamforth and J. W. Figg, eds., Cambridge UK, 1996, pp.481-490.
13 Marcotte, T. D., Hansson, C. M. and Hope, B. B., "The effect of the electrochemical chloride extraction treatment on steel-reinforced mortar Part II: Microstructural characterization", Cement and Concrete Research, Vol. 29, No. 10, 1999b, pp.1561-1568.   DOI   ScienceOn