| Title |
Corrosion Level Prediction of Reinforcing Bar Using Electric Resistance and Current Density Measurement Method |
| Authors |
Chang Lan ; Cho Seung-Ho ; Park In-Kwan |
| Keywords |
Corrosion level ; Electric resistance ; Electric current density ; Non-destructive measurement ; Durability |
| Abstract |
The purpose of this study is to identify corrosion mechanism and develop qualitative measurement method of corrosion level. Fist of all, structural behavior of each different level of corrosion states have been evaluated. And mathematical models that can predict corrosion level in terms of electric potential, corrosion intensity, and Ohmic resistance are proposed. Corrosion rate in reinforcing bar was investigated in this study using accelerated corrosion method due to electric potential differences based on Faradays law. Total 288 measurement spots were designed in terms of corrosion rates, diameter of reinforcing bars, and concrete cover thickness. Corrosion current densities, corrosion potentials, and ohmic resistances of concrete were measured on these specimens using Gecor device. This study suggested the relationship between corrosion levels, measured electrical resistance and measured electric current density as follows. y = 0.17 x1^2 - 3.57 x1 + 18.81 (R^2 = 0.89) y = -0.64 x2^2 + 17.63 x2 - 2.58 (R^2 = 0.86) Where x1 is electric current density , x2 is electric resistance, and y is corrosion level. |