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http://dx.doi.org/10.5345/JKIBC.2022.22.6.651

Monitoring of Concrete Deterioration Caused by Steel Corrosion using Electrochemical Impedance Spectroscopy(EIS)  

Woo, Seong-Yeop (Department of ICT Integrated Ocean Smart Cities Engineering, Dong-A University)
Kim, Je-Kyoung (National Core Research Center for Disaster-free and Safe Ocean Cities Construction, Dong-A University)
Yee, Jurng-Jae (ICT integrated Ocean Smart Cities Engineering, Dong-A University)
Kee, Seong-Hoon (ICT integrated Ocean Smart Cities Engineering, Dong-A University)
Publication Information
Journal of the Korea Institute of Building Construction / v.22, no.6, 2022 , pp. 651-662 More about this Journal
Abstract
The electrochemical impedance spectroscopy(EIS) method was used to evaluate the concrete deterioration process related to chloride-induced steel corrosion with various corrosion levels(initiation, rust propagation and acceleration periods). The impressed current technique, with four total current levels of 0C, 13C, 65C and 130C, was used to accelerate steel corrosion in concrete cylinder samples with w/c ratio of 0.4, 0.5, and 0.6, immersed in a 0.5M NaCl solution. A series of EIS measurements was performed to monitor concrete deterioration during the accelerated corrosion test in this study. Some critical parameters of the equivalent circuit were obtained through the EIS analysis. It was observed that the charge transfer resistance(Rc) dropped sharply as the impressed current increased from 0C to 13C, indicating a value of approximately 10kΩcm2. However, the sensitivity of Rc significantly decreased when the impressed current was further increased from 13C to 130C after corrosion of steel had been initiated. Meanwhile, the double-layer capacitance value(Cdl) linearly increased from 50×10-6μF/cm2 to 250×10-6μF/cm2 as the impressed current in creased from 0C to 130C. The results in this study showed that monitoring Cdl is an effective measurement parameter for evaluating the progress of internal concrete damages(de-bonding between steel and concrete, micro-cracks, and surface-breaking cracks) induced by steel corrosion. The findings of this study provide a fundamental basis for developing an embedded sensor and signal interpretation method for monitoring concrete deterioration due to steel corrosion at various corrosion levels.
Keywords
chloride-induced deterioration; concrete; steel corrosion; electrochemical impedance spectroscopy monitoring; non-destructive evaluation;
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Times Cited By KSCI : 2  (Citation Analysis)
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