Determination of nonlinear elastic constants and stress monitoring in concrete by coda waves analysis / Cédric Payan in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 519-531 Titre : Determination of nonlinear elastic constants and stress monitoring in concrete by coda waves analysis Type de document : texte imprimé Auteurs : Cédric Payan, Auteur ; Vincent Garnier, Auteur ; Joseph Moysan, Auteur Année de publication : 2011 Article en page(s) : pp. 519-531 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Stress monitoring Nonlinear parameter Coda waves Multiple scattering Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : For non destructive stress evaluation in prestressed concrete, we describe in this paper a promising ultrasonic method. In “ordinary” isotropic homogeneous materials such as steel, ultrasonic determination of third order elastic constants provides means for stress evaluation since half a century. In case of concrete, example of a class of materials that exhibit strong multiple scattering as well as significant elastic nonlinear response, accurate velocity monitoring is challenging. In this paper, we purpose a novel method originally from geophysics. So called “coda wave interferometry” (CWI), this technique is transposed to concrete. We show that intense scattering can be applied to robustly determine velocity changes and so, nonlinear elastic constants. In addition, we show how this method could be transposed in case of in situ measurements in concrete structures and outline future possible applications. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16042 [article] Determination of nonlinear elastic constants and stress monitoring in concrete by coda waves analysis [texte imprimé] / Cédric Payan, Auteur ; Vincent Garnier, Auteur ; Joseph Moysan, Auteur . - 2011 . - pp. 519-531. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 519-531 Mots-clés : Stress monitoring Nonlinear parameter Coda waves Multiple scattering Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : For non destructive stress evaluation in prestressed concrete, we describe in this paper a promising ultrasonic method. In “ordinary” isotropic homogeneous materials such as steel, ultrasonic determination of third order elastic constants provides means for stress evaluation since half a century. In case of concrete, example of a class of materials that exhibit strong multiple scattering as well as significant elastic nonlinear response, accurate velocity monitoring is challenging. In this paper, we purpose a novel method originally from geophysics. So called “coda wave interferometry” (CWI), this technique is transposed to concrete. We show that intense scattering can be applied to robustly determine velocity changes and so, nonlinear elastic constants. In addition, we show how this method could be transposed in case of in situ measurements in concrete structures and outline future possible applications. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16042

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Effect of water saturation and porosity on the nonlinear elastic response of concrete / Cédric Payan in Cement and concrete research, Vol. 40 N° 3 (Mars 2010)  

Public ISBD [article]  inCement and concrete research > Vol. 40 N° 3 (Mars 2010) . - pp. 473–476 Titre : Effect of water saturation and porosity on the nonlinear elastic response of concrete Type de document : texte imprimé Auteurs : Cédric Payan, Auteur ; Garnier, Bernard, Auteur ; Joseph Moysan, Auteur Année de publication : 2012 Article en page(s) : pp. 473–476 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Characterization  Spectroscopy Mechanical Properties Nonlinear acoustics Résumé : Nonlinear interaction of a monochromatic elastic wave with a low frequency should be a good tool for non-destructive evaluation of existing concrete structures. Nonlinear indicators have already proved efficient in detecting global damage by exhibiting a significant sensitivity regarding classical linear ultrasonic methods like wave speed or attenuation. However, it is necessary to understand the influence of some structural parameters such as porosity, stress state, or water saturation on the nonlinear processes. In this way, a recent model containing all of these potential contributors is presented in this paper. It is sustained by nonlinear interaction experiments in impact mode. This method reveals a great potential for in situ measurements with a low frequency propagating into the whole structure. We make use of a calibrated concrete sample's series, conditioned at different water saturation states, to quantify the influence of water content and porosity on the nonlinear response of concrete. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609003159 [article] Effect of water saturation and porosity on the nonlinear elastic response of concrete [texte imprimé] / Cédric Payan, Auteur ; Garnier, Bernard, Auteur ; Joseph Moysan, Auteur . - 2012 . - pp. 473–476. Bibliogr. Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 3 (Mars 2010) . - pp. 473–476 Mots-clés : Characterization  Spectroscopy Mechanical Properties Nonlinear acoustics Résumé : Nonlinear interaction of a monochromatic elastic wave with a low frequency should be a good tool for non-destructive evaluation of existing concrete structures. Nonlinear indicators have already proved efficient in detecting global damage by exhibiting a significant sensitivity regarding classical linear ultrasonic methods like wave speed or attenuation. However, it is necessary to understand the influence of some structural parameters such as porosity, stress state, or water saturation on the nonlinear processes. In this way, a recent model containing all of these potential contributors is presented in this paper. It is sustained by nonlinear interaction experiments in impact mode. This method reveals a great potential for in situ measurements with a low frequency propagating into the whole structure. We make use of a calibrated concrete sample's series, conditioned at different water saturation states, to quantify the influence of water content and porosity on the nonlinear response of concrete. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609003159

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