Monitoring the corrosion and remediation of reinforced concrete on-site: An alternative approach

Abstract

Difficulties associated with the interpretation of site data collected over long periods of time from commonly used electrochemical corrosion monitoring techniques often make it difficult to assess the corrosion of reinforcing steel. An alternative approach for the interpretation of data is proposed, based on a model of the quality of passive film upon the steel surface. This model leads to a representation of the corrosion state by means of the relationship, over a long period of time, of the corrosion potential and the logarithm of the Linear Polarization Resistance, since both are functions inter alia of corrosion rate. It is shown that for the reinforced concrete panels tested, data points representing this relationship closely fitted a family of results; allowing the development of a "monitoring control diagram", MCD. The MCD reveals that for a fixed geometry and experimental conditions, a relationship between the corrosion potential and polarization resistance of steel exists, facilitating a useful monitoring tool for assessment of both the corrosion and remediation of reinforced concrete structures. Particular emphasis is placed on the latter in this work.

Evaluation and Analyses of Rhizophora mangle L. Leaf-Extract Corrosion-Mechanism on Reinforcing Steel in Concrete Immersed in Industrial/Microbial Simulating-Environment

“…However, this lead to the other problem that adequate monitoring and requisite interpretations would be required to ascertain the performance effectiveness of alternative substances for the hazardous but highly effective traditional inhibitors. This is problematic from the view, posited in studies, that while known electrochemical methods exhibiting good relations to the technical and financial scope of non-destructive electrochemical testing provide information on what is ongoing in concrete, none gives the whole story (Birbilis and Cherry, 2005). Suggested approach for tackling these include combining different electrochemical test-techniques for complimenting one another (Gulikers, 2010;Song and Saraswathy, 2007) even as test-data from them could also be subjected to further analyses for obtaining more meaningful conclusion on effectiveness performance (Birbilis and Cherry, 2005).…”