Corrosion monitoring of reinforcing bars by electrochemical noise measurement

Abstract

The electrochemical noise of reinforcing bars embedded in mortar containing NaCl was continuously measured with the aim of developing a technique of monitoring reinforcement corrosion by electrochemical noise measurement. After the measurement, the noise resistance and pitting index were calculated in an attempt to grasp the changes in the corrosion rate and estimate the state of corrosion using these parameters. As a result, it was found that changes in the corrosion rate can be monitored by the noise resistance and that local or uniform corrosion can be judged by the pitting index. These parameters are therefore found applicable as indices for corrosion diagnosis.