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Influence of in situ concrete variability on accelerated carbonation test / Ph. Turcry in European journal of environmental and civil engineering, Vol. 16 N° 3-4 (Mars/Avril 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 288-297 Titre : Influence of in situ concrete variability on accelerated carbonation test Type de document : texte imprimé Auteurs : Ph. Turcry, Auteur ; Younsi, A., Auteur ; F. Jacquemot, Auteur Année de publication : 2012 Article en page(s) : pp. 288-297 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Carbonation  Accelerated  test  Variability  In  situ  concrete Résumé : Probabilistic approaches to design reinforced concrete structures require the knowledge of distribution laws governing the statistical variability of concrete properties used as models inputs. The present work focuses on the variability of carbonation resistance throughout the construction period and inside an existing structure. Accelerated carbonation tests were carried out in a laboratory on more than 120 samples taken from two real building sites. Samples drilled from a bridge crosshead were also investigated. In the case of production-variability, the statistical distribution of the carbonation depths was found to be correctly modelled by a normal statistical distribution, as usually done for compressive strengths. However, these two properties appeared to be little correlated. Inside the structure, the carbonation resistance was shown to be higher with the distance to the surface of the drilled samples. In addition to experimental results, the efficiency of the accelerated carbonation test protocol, especially the preconditioning prior to carbonation, is discussed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667707 [article] Influence of in situ concrete variability on accelerated carbonation test [texte imprimé] / Ph. Turcry, Auteur ; Younsi, A., Auteur ; F. Jacquemot, Auteur . - 2012 . - pp. 288-297. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 288-297 Mots-clés : Carbonation  Accelerated  test  Variability  In  situ  concrete Résumé : Probabilistic approaches to design reinforced concrete structures require the knowledge of distribution laws governing the statistical variability of concrete properties used as models inputs. The present work focuses on the variability of carbonation resistance throughout the construction period and inside an existing structure. Accelerated carbonation tests were carried out in a laboratory on more than 120 samples taken from two real building sites. Samples drilled from a bridge crosshead were also investigated. In the case of production-variability, the statistical distribution of the carbonation depths was found to be correctly modelled by a normal statistical distribution, as usually done for compressive strengths. However, these two properties appeared to be little correlated. Inside the structure, the carbonation resistance was shown to be higher with the distance to the surface of the drilled samples. In addition to experimental results, the efficiency of the accelerated carbonation test protocol, especially the preconditioning prior to carbonation, is discussed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667707