The Impact of Electrochemical Chloride Extraction on Reinforced Bond

Abstract:

This paper examines the impact of type of electrolyte solutions, standing time without electricity on the reinforced bond of the concrete of different water cement ratio before and after chloride extraction, processes the microscopic structure and mechanism analysis. The electrochemistry method can discharge the chlorine salt without destroying the original concrete protective layer and realize the non-loss, low cost and fast repair for the concrete structure destroyed by the chlorine salt corrosion. The results show a substantial loss of the reinforced bond (70-76%) after chloride extraction according to the concrete of different water cement ratio, and the decrease is in proportion to the current-on time and the electrochemical capacity of the electrolyte. The increased partial porosity of the cathode area of the concrete by the chlorine and hydrogen produced in the process of electrochemical chlorine extraction, the decomposition and softening of the concrete hydration products with external field are the main reasons for the dramatic drop of the reinforce bond.

• Periodical: Materials Science Forum (Volume 902)
• Pages: 41-46
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.902.41
• Online since: July 2017
• Authors: Kun Zhang*, Wei Shan, Wen Bo Sun
• Keywords: Age, Electrochemical Chloride Extraction, Electrolyte, Reinforced Bond

References

[1] Polder R, Vander H J. Electrochemical realkalisation and chloride removal of concrete, state of the art, laboratory and field experience [A]. Proceedings of RILEM conference, rehabilitation of concrete structures[C]. Melbourne: RILEM, 1992, 135~147.

[2] Hansson I L, Hansson C M. Electrochemical extraction of chlorides from concrete part I - a qualitative model of the process[J]. Cement and Concrete Research, 1993, 23(5): 1141~1152.

DOI: 10.1016/0008-8846(93)90174-8

[3] 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.

DOI: 10.1016/j.cemconres.2005.12.008

[4] Miguel A C, María J S, Guillem V. Effect of type of anodic arrangements on efficiency of electrochemical chloride removal from concrete[J]. ACI Materials Journal, 2006, 103(4): 243~250.

DOI: 10.14359/16607

[5] J. Bennett, T.J. Schue, et al. Electrochemical Chloride Removal and Protection of Concrete Bridge Components: Laboratory Studies Strategic High-way Research Program. National Research Council, Washington DC, (1993).

[6] Chunlin Deng, Long Chen, etc. Effects of Electrochemical Chloride Extraction on the Bond Strength Between Steel and Concrete. South China Harbour Engineering, 2008, (6)34~38.

[7] N.M. Ihekwaba, B.B. Hope. Pull - out and Bond Degradation of Steel Rebars in ECE Concrete. Cement and concrete research, 1996, (26)267- 282.

DOI: 10.1016/0008-8846(95)00210-3

[8] G. E. Rose. Desalination-a Review of Research on Possible Change in the Steel- to- Concrete Bond Strength. Proceeding of the International Conference on Repair of Concrete Structures. Svolver, Norway, May, 1997: 309-318.

[9] J. B. Miller, G. E. Nustad. Effect of Electrochemical Tretment on Steel-to-Concrete Bond Strength. Engineering Solution to Industrial Corrosion Problems, Nace, Sandefjord, June, 1993: 49-51.

[10] S. Pritpal, S. Elgart. Flexural Strength of Concrete Beams with Corroding Reinforcement. ACI Structure Journal, 1999, 156(1)149 -158.

[11] J.C. Orellan, G. Escadeillas. Electrochemical Chioride Extraction: Efficiency and Side Effects . Cement and Concrete Research, 2004, ( 34) 227- 234.

DOI: 10.1016/j.cemconres.2003.07.001

[12] Li Senlin. Research on the effects of Electrochemical Chloride Extraction on rebar-mortar system. Nanjing Hydraulic Research Institute, Nanjing, China, 2001. 1-4.