Non-Destructive and Quantitative Evaluation for Corrosion of Reinforcing Steel in Concrete Using Electro-Chemical Inspection System

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Title: Non-Destructive and Quantitative Evaluation for Corrosion of Reinforcing Steel in Concrete Using Electro-Chemical Inspection System

Author(s): K. Takewaka, S. Matsumoto, and M. Khin

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 339-358

Keywords: concrete slabs; corrosion; inspection; nondestructive tests; quantitative analysis; reinforcing steels; General

Date: 11/1/1991

Abstract:
The half-cell potential method, one of the electrochemical techniques, is very simple and possibly the most practical method as the nondestructive inspection system for steel corrosion in concrete. However, at present, this method has been regarded as an inspection only for qualitative information on corrosion. In this study, the effectiveness of the half-cell potential method on the corrosion inspection system for steel in concrete was theoretically and experimentally analyzed, and the following results were obtained: 1) configuration of the potential distribution on the structure is more important than the value of potential itself for acquiring quantitative corrosion information on steel in concrete structures, 2) progressive corrosion area of steel reinforcement can be estimated by finding the inflection point of potential distribution curve, and 3) if the electric resistivity of concrete is measured at the same time as the potential, approximate corrosion weight loss of reinforcement can be estimated by using both the potential and this resistivity distribution data.