Advanced Methods of Corrosion Monitoring- A Review

Abstract

Presently it is found that RC structures decays with respect to time before its design life period is achieved. Many researchers found the principle cause of degradation is corrosion of steel reinforcement. Surrounding environment and some physical properties are responsible for corrosion of steel in concrete. Formation of cracks due to corrosion is the key indicator end of the service life. Corrosion of steel reinforcement starts well before the formation of the cracks and cannot be detected by visual means and can be determined by some non-destructive means. Therefore, the assessment of residual capacity, conservation and arrangement for renovation of those structures needs Non-Destructive inspection and monitoring methods that detect the corrosion at early stage. Suitably monitoring the structures for corrosion problem and taking appropriate measurements at right time could affect huge savings. With the help of corrosion monitoring we can get wide-ranging info about fluctuating conditions of structure in time. The methods used for the assessment of corrosion are Open Circuit Potential (OCP) method, Surface Potential method, Linear Polarization Resistivity (LPR) measurement and many more but didn't give current corrosion stage in RC structures. Present study include the review of some modern methods like Acoustic Emission, Galvanic Monitoring Probe, Potentio-Dynamic, High Frequency UV and Fibre Optics method summarising their merits, demerits and suitability in field use. This will be helpful for other researchers gaining fundamentals of corrosion monitoring, different methods and equipment. Also will be use full to continue further research and development of commercial instruments for precise determination of corrosion status in existing structures.