Electrical resistance tomography imaging of concrete / Kimmo Karhunen in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010)  

Public ISBD [article]  inCement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 137-145 Titre : Electrical resistance tomography imaging of concrete Type de document : texte imprimé Auteurs : Kimmo Karhunen, Auteur ; Aku Seppanen, Auteur ; Anssi Lehikoinen, Auteur Article en page(s) : pp. 137-145 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete Electrical properties Crack detection Non-destructive testing Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : We apply Electrical Resistance Tomography (ERT) for three dimensional imaging of concrete. In ERT, alternating currents are injected into the target using an array of electrodes attached to the target surface, and the resulting voltages are measured using the same electrodes. These boundary measurements are used for reconstructing the internal (3D) conductivity distribution of the target. In reinforced concrete, the metallic phases (reinforcing bars and fibers), cracks and air voids, moisture gradients, and the chloride distribution in the matrix carry contrast with respect to conductivity. While electrical measurements have been widely used to characterize the properties of concrete, only preliminary results of applying ERT to concrete imaging have been published so far. The aim of this paper is to carry out a feasibility evaluation with specifically cast samples. The results indicate that ERT may be a feasible modality for non-destructive evaluation of concrete. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] [article] Electrical resistance tomography imaging of concrete [texte imprimé] / Kimmo Karhunen, Auteur ; Aku Seppanen, Auteur ; Anssi Lehikoinen, Auteur . - pp. 137-145. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 137-145 Mots-clés : Concrete Electrical properties Crack detection Non-destructive testing Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : We apply Electrical Resistance Tomography (ERT) for three dimensional imaging of concrete. In ERT, alternating currents are injected into the target using an array of electrodes attached to the target surface, and the resulting voltages are measured using the same electrodes. These boundary measurements are used for reconstructing the internal (3D) conductivity distribution of the target. In reinforced concrete, the metallic phases (reinforcing bars and fibers), cracks and air voids, moisture gradients, and the chloride distribution in the matrix carry contrast with respect to conductivity. While electrical measurements have been widely used to characterize the properties of concrete, only preliminary results of applying ERT to concrete imaging have been published so far. The aim of this paper is to carry out a feasibility evaluation with specifically cast samples. The results indicate that ERT may be a feasible modality for non-destructive evaluation of concrete. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...]

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