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Effect of carbonation on the hydro-mechanical properties of Portland cements / A. Fabbria in Cement and concrete research, Vol. 39 N° 12 (Décembre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 12 (Décembre 2009) . - pp.1156-1163 Titre : Effect of carbonation on the hydro-mechanical properties of Portland cements Type de document : texte imprimé Auteurs : A. Fabbria, Auteur ; J. Corvisiera, Auteur ; A. Schubnel, Auteur Année de publication : 2010 Article en page(s) : pp.1156-1163 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Characterization  ;  Microcraking  ;  Carbonation  ;  Elastic  moduli  Permeability Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : We evaluate experimentally the effect of carbonation on the hydro-mechanical properties of Portland cement. Samples were carbonated at 90 °C and 28 MPa under wet supercritical CO2. Two types of carbonation features were achieved, either the samples were homogeneously carbonated or they displayed sharp carbonation fronts. Using a tri-axial apparatus, the static elastic moduli and the mechanical strength were measured at in-situ pressure conditions (28 MPa) and showed a degradation of the mechanical properties of the samples where a carbonation front prevailed. Water and gas permeabilities were measured and showed that the samples with a carbonation front exhibit a stress sensitive permeability. P and S elastic wave velocities were measured to evaluate dynamic (ultrasonic range, 1 MHz) elastic moduli. The use of an effective medium theory approach enabled us to characterize the density and distribution of cracks within the samples. This approach outlines that the samples which developed a carbonation front were damaged. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609002014 [article] Effect of carbonation on the hydro-mechanical properties of Portland cements [texte imprimé] / A. Fabbria, Auteur ; J. Corvisiera, Auteur ; A. Schubnel, Auteur . - 2010 . - pp.1156-1163. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 12 (Décembre 2009) . - pp.1156-1163 Mots-clés : Characterization  ;  Microcraking  ;  Carbonation  ;  Elastic  moduli  Permeability Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : We evaluate experimentally the effect of carbonation on the hydro-mechanical properties of Portland cement. Samples were carbonated at 90 °C and 28 MPa under wet supercritical CO2. Two types of carbonation features were achieved, either the samples were homogeneously carbonated or they displayed sharp carbonation fronts. Using a tri-axial apparatus, the static elastic moduli and the mechanical strength were measured at in-situ pressure conditions (28 MPa) and showed a degradation of the mechanical properties of the samples where a carbonation front prevailed. Water and gas permeabilities were measured and showed that the samples with a carbonation front exhibit a stress sensitive permeability. P and S elastic wave velocities were measured to evaluate dynamic (ultrasonic range, 1 MHz) elastic moduli. The use of an effective medium theory approach enabled us to characterize the density and distribution of cracks within the samples. This approach outlines that the samples which developed a carbonation front were damaged. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609002014