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Determination of the bulk elastic moduli of various concretes by resonance frequency analysis of slabs submitted to impact echo / Géraldine Villain in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 601-617 Titre : Determination of the bulk elastic moduli of various concretes by resonance frequency analysis of slabs submitted to impact echo Type de document : texte imprimé Auteurs : Géraldine Villain, Auteur ; Loïc Le Marrec, Auteur ; Lalaonirina Rakotomanana, Auteur Année de publication : 2011 Article en page(s) : pp. 601-617 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Impact  echo  Porosity  Degree  of  saturation  Carbonation  Concrete Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The presented study aims at evaluating the bulk elastic Young’s modulus of six different concrete mixes as a function of porosity and water content. The impact echo method consists of a frequency analysis of ultrasonic waves generated by the impact of a steel ball. It is commonly used to measure the thickness of large concrete slabs, to detect voids in concrete structural elements considered as infinite. This method was employed on reduced size slabs (0.5 x 0.25 x 0.12 m3). As a consequence, it was necessary to identify the frequencies corresponding to resonance modes or pseudo-stationary modes. This modal analysis was performed with simplified models (for beam in particular) and used to extract the dynamic Young’s modulus Edyn and the Poisson’s ratio. The results are then analysed. The Edyn-modulus, inverted for all concrete mixes, is compared to static Young’s modulus Estat measured by destructive testing, to the porosity and to the water content of the specimens. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16048 [article] Determination of the bulk elastic moduli of various concretes by resonance frequency analysis of slabs submitted to impact echo [texte imprimé] / Géraldine Villain, Auteur ; Loïc Le Marrec, Auteur ; Lalaonirina Rakotomanana, Auteur . - 2011 . - pp. 601-617. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 601-617 Mots-clés : Impact  echo  Porosity  Degree  of  saturation  Carbonation  Concrete Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The presented study aims at evaluating the bulk elastic Young’s modulus of six different concrete mixes as a function of porosity and water content. The impact echo method consists of a frequency analysis of ultrasonic waves generated by the impact of a steel ball. It is commonly used to measure the thickness of large concrete slabs, to detect voids in concrete structural elements considered as infinite. This method was employed on reduced size slabs (0.5 x 0.25 x 0.12 m3). As a consequence, it was necessary to identify the frequencies corresponding to resonance modes or pseudo-stationary modes. This modal analysis was performed with simplified models (for beam in particular) and used to extract the dynamic Young’s modulus Edyn and the Poisson’s ratio. The results are then analysed. The Edyn-modulus, inverted for all concrete mixes, is compared to static Young’s modulus Estat measured by destructive testing, to the porosity and to the water content of the specimens. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16048