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http://dx.doi.org/10.14190/JRCR.2022.10.4.553

Evaluation of Chloride Extraction under Electrochemical Chloride Extraction  

Jiseok, Kim (Department of Civil and Environmental System Engineering, Hanyang University)
Ki-Yong, Ann (Department of Civil and Environmental System Engineering, Hanyang University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.10, no.4, 2022 , pp. 553-557 More about this Journal
Abstract
The present study evaluate the chloride extracion under electrochemical chloride extraction method. Chloride was penetrated into the concrete from external reservoir using a 4M NaCl solution, and an electrochemical chloride extraction method was applied after the curing period of 1 year. The current density was constantly kept 1000 mA/m2 for coulostatic application with the variation in potential difference. The duration of the ECE treatment was 2, 4, 8 weeks, respectively. The residual chloride concentration at all depths decreased, and the chloride concentration decreased as the application period increased. After the application period of 8 weeks, 62.9 to 77.6 % of chloride extracted in the total chloride profile, and 77.7 to 99.5 % of chloride extracted in the free chloride profile. In particular, the concentration of free chloride at a depth of 7 mm or more from the concrete surface was 0.01 % or less by cement. In addition, it was confirmed that the bound chloride could be extracted by the electrochemical chloride extraction.
Keywords
Electrochemical treatment; Chloride extraction; Chloride binding; Corrosion;
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