Evaluation of capacitor sensor performance in reinforced concrete for corrosion monitoring

Abstract

In this paper, a capacitor sensor was developed with intention to detect and evaluate corrosion activity in reinforced concrete slab sample. The performance of capacitor sensor was evaluated to determine the workability of the sensor in detecting impedance pattern when embedded in concrete structure. The diameter of impedance pattern can give the polarization resistance which is useful to calculate corrosion rate for future development. This was done by detecting the impedance Nyquist plot of concrete sample. The capacitor sensor was tied to the reinforcement bar and the sample was immersed in 3.5% NaCl solution for seven days. The result shows that the capacitor sensor is fully functional in detecting impedance pattern. Hence, demonstrates potential capability of the sensor in measuring corrosion activity in concrete.