SYMPOSIA PAPER Published: 01 January 1990

Study of the Corrosion of Concrete Reinforcement by Electrochemical Impedance Measurement


Electrochemical impedance measurement is a convenient method to analyze the corrosion phenomena of steel in concrete. A data analysis method is used on the basis of an equivalent circuit correlated to the properties of concrete and electrochemical mechanisms. The different parts of the diagram versus frequency allow characterization of the concrete cover, the presence of a film at the surface of steel, the transfer resistance connected to the anodic reaction, and some other relaxation phenomena. Some agreement has been obtained with mass losses.

A mathematical model has been developed in order to analyze the results on large concrete beams with a small-size auxiliary electrode. Particular emphasis is given to the spatial location of an active area in order to demonstrate the feasibility of such a method either on large specimens or on real structures. For this application, the principle of an alternative method was developed. An auxiliary electrode is used with an electrical guard. At low frequencies (<10 Hz), the first experimentation gives encouraging results.

Author Information

Lemoine, L
Infremer, Plouzané, France
Wenger, F
Ecole Centrale Paris, Paris, France
Galland, J
Ecole Centrale Paris, Paris, France
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: G01
Pages: 118–133
DOI: 10.1520/STP25019S
ISBN-EB: 978-0-8031-5126-0
ISBN-13: 978-0-8031-1458-6