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Micromechanics-based predictions on the overall stress-strain relations of cement-matrix composites / Tsung-Hui Kuo in Journal of engineering mechanics, Vol. 134 n°12 (Décembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°12 (Décembre 2008) . - pp.1045–1052. Titre : Micromechanics-based predictions on the overall stress-strain relations of cement-matrix composites Type de document : texte imprimé Auteurs : Tsung-Hui Kuo, Auteur ; Huang Hsing Pan, Auteur ; George J. Weng, Auteur Année de publication : 2009 Article en page(s) : pp.1045–1052. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Mortar  Stress  strain  relation  Micromechanics  Predictions  Cements Résumé : A micromechanics-based model is proposed to determine the nonlinear stress-strain relations of cement-matrix composites at different concentrations of inclusions (aggregates). We first conducted some experiments to uncover the stress-strain behavior of the cement paste with a water-to-cement ratio of 0.45, and those of the mortar with the same cement paste but at three different volume concentrations of aggregates. The behavior of the cement paste is then simulated by Burgers’ rheological model. In the development of the composite model, we extend the linear elastic response to the nonlinear one through the replacement of elastic moduli by the corresponding secant moduli. The nonlinear stress-strain curves of the cement-matrix composite are then determined from those of the cement paste and inclusions. It is shown that the predicted stress-strain curves of the mortar are in close agreement with the experimental curves up to an aggregate volume fraction of 49% or 60wt% . ISSN : 0733-9399 En ligne : Mortar, Stress strain relation, Micromechanics, Predictions, Cements Read More:  [...] [article] Micromechanics-based predictions on the overall stress-strain relations of cement-matrix composites [texte imprimé] / Tsung-Hui Kuo, Auteur ; Huang Hsing Pan, Auteur ; George J. Weng, Auteur . - 2009 . - pp.1045–1052. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°12 (Décembre 2008) . - pp.1045–1052. Mots-clés : Mortar  Stress  strain  relation  Micromechanics  Predictions  Cements Résumé : A micromechanics-based model is proposed to determine the nonlinear stress-strain relations of cement-matrix composites at different concentrations of inclusions (aggregates). We first conducted some experiments to uncover the stress-strain behavior of the cement paste with a water-to-cement ratio of 0.45, and those of the mortar with the same cement paste but at three different volume concentrations of aggregates. The behavior of the cement paste is then simulated by Burgers’ rheological model. In the development of the composite model, we extend the linear elastic response to the nonlinear one through the replacement of elastic moduli by the corresponding secant moduli. The nonlinear stress-strain curves of the cement-matrix composite are then determined from those of the cement paste and inclusions. It is shown that the predicted stress-strain curves of the mortar are in close agreement with the experimental curves up to an aggregate volume fraction of 49% or 60wt% . ISSN : 0733-9399 En ligne : Mortar, Stress strain relation, Micromechanics, Predictions, Cements Read More:  [...]