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A multiscale model for modulus of elasticity of concrete at high temperatures / Jaesung Lee in Cement and concrete research, Vol. 39 N° 9 (Septembre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 9 (Septembre 2009) . - pp. 754–762 Titre : A multiscale model for modulus of elasticity of concrete at high temperatures Type de document : texte imprimé Auteurs : Jaesung Lee, Auteur ; Xi, Yunping, Auteur ; Kaspar Willam, Auteur Année de publication : 2009 Article en page(s) : pp. 754–762 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Composite  mechanics;  Modulus  of  elasticity;  High  temperature;  Concrete Résumé : In this paper, the thermal degradation of modulus of elasticity of concrete is modeled by composite mechanics at three scales of observation: (a) at the level of concrete, (b) at the level of mortar, and (c) the cement paste level. At the latter, the change of volume fractions of the constituents are evaluated based on phase transformations which take place in different temperature ranges. Stoichiometric models are used to determine the volume changes of the constituents. At the mortar and concrete levels, the temperature dependence of fine and coarse aggregates is considered based on available test data. The multiscale chemo-mechanical model can be used to predict the temperature dependence and thermal degradation of the elastic concrete modulus. The model predictions are compared with test data in the literature as well as in-house test data. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001227 [article] A multiscale model for modulus of elasticity of concrete at high temperatures [texte imprimé] / Jaesung Lee, Auteur ; Xi, Yunping, Auteur ; Kaspar Willam, Auteur . - 2009 . - pp. 754–762. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 9 (Septembre 2009) . - pp. 754–762 Mots-clés : Composite  mechanics;  Modulus  of  elasticity;  High  temperature;  Concrete Résumé : In this paper, the thermal degradation of modulus of elasticity of concrete is modeled by composite mechanics at three scales of observation: (a) at the level of concrete, (b) at the level of mortar, and (c) the cement paste level. At the latter, the change of volume fractions of the constituents are evaluated based on phase transformations which take place in different temperature ranges. Stoichiometric models are used to determine the volume changes of the constituents. At the mortar and concrete levels, the temperature dependence of fine and coarse aggregates is considered based on available test data. The multiscale chemo-mechanical model can be used to predict the temperature dependence and thermal degradation of the elastic concrete modulus. The model predictions are compared with test data in the literature as well as in-house test data. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001227