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Experimental and theoretical study of reinforced concrete corrosion using impedance measurements

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1016/B978-008043890-0/50008-0
AuteurRechercher : ; Rechercher : ; Rechercher :
FormatTexte, Article
ConférenceDurability Workshop, 26–27 October, 2000, Berkeley, CA USA
Sujetconcrete; reinforcing steel bars; corrosion impedance; apparent resistivity
Résumé
The embedded rebar and the concrete matrix have distinct electrical resistive behaviors. When current is injected into the concrete matrix, the current distribution is distorted by the presence of the rebar, and the measured voltage response reflects this distortion. The ratio of the voltage between two electrodes on the surface of a conducting medium to the current injected between two other electrodes, defines the surface impedance of the medium. Its value depends on the distribution of the conductivity in the medium and, for reinforced concrete, on the interface impedance between the concrete and the metal reinforcing rods. The surface impedance for a cylindrical conductor beneath and parallel to the surface can be modeled analytically. Such a model can simulate the surface impedance measurement for an embedded reinforcing steel bar, which has complex and frequency-dependent impedance at the interface between the bar and the concrete. A comparison between the interface impedance and the modeled surface impedance shows that the essential characteristics in the interface impedance are preserved in the response measured on concrete surface.
Date de publication
Maison d’éditionElsevier
Dans
  • Long Term Durability of Structural Materials: Durability 2000 Proceedings of the Durability Workshop, Berkeley, California, 26–27 October, 2000 (2001) : 71–84.
Langueanglais
Publications évaluées par des pairsOui
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Enregistrement créé2021-10-07
Enregistrement modifié2021-10-07
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