| Title |
Evaluation of Chloride-Induced Steel Corrosion and Concrete Deterioration Using Electrochemical Impedance Spectroscopy (EIS) |
| Authors |
우성엽(Woo, Seong-Yeop) ; 김제경(Kim, Je-Kyung) ; 이정재(Yee, Jurng-Jae) ; 기성훈(Kee, Seong-Hoon) |
| DOI |
https://doi.org/10.5659/JAIK.2023.39.12.269 |
| Keywords |
Chloride-induced deterioration; Concrete; Steel corrosion; EIS monitoring; Non-destructive evaluation |
| Abstract |
In this study, it was utilized Electrochemical Impedance Spectroscopy(EIS) to evaluate the deterioration of concrete caused by the propagation
of cracks due to chloride-induced steel corrosion at different corrosion stages. Concrete specimens with a water-to-cement ratio of 0.5 were
immersed in a NaCl solution to simulate four corrosion stages(0C, 650C, 1300C, and 2600C) through accelerated corrosion experiments on
steel reinforcement. EIS analysis revealed key parameters like charge solution resistance(RS), transfer resistance(RC) and double layer
capacitance(Cdl). RS decreased significantly according to occurring concrete cracks. RC value decreased sharply at the onset of corrosion, while
Cdl vlaue gradually increased with higher impressed current, reflecting oxygen diffusion rates and crack development. These findings provide
insights for signal interpretation methods to monitor concrete degradation due to steel corrosion at various stages. And based on these results,
this study had proposed criteria for evaluating steel corrosion and concrete damage conditions. |