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Water desorption and shrinkage in mortars and cement pastes: Experimental study and poromechanical model / Thomas Rougelota in Cement and concrete research, Vol. 39 N° 1 (Janvier 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 1 (Janvier 2009) . - pp. 36–44 Titre : Water desorption and shrinkage in mortars and cement pastes: Experimental study and poromechanical model Type de document : texte imprimé Auteurs : Thomas Rougelota, Auteur ; Frédéric Skoczylas, Auteur ; Nicolas Burlion, Auteur Année de publication : 2009 Article en page(s) : pp. 36–44 Langues : Anglais (eng) Mots-clés : Water  desorption  curves;  Cement  paste;  Mortar;  Shrinkage;Modelling Résumé : The aim of the present research was to study moisture changes and strains induced by smooth water desorption of several cement based materials. The main advantage of this small-steps drying is to dramatically limit the structural effect within tested samples, by lowering moisture gradients and therefore cracking due to differential shrinkage. Resulting data are of importance as they allow water retention curves, porosity distribution and desiccation shrinkage to be determined versus a large range of relative humidity. Experiments were conducted on ordinary mortars and cement pastes with water-to-cement ratio of 0.5 and 0.8. The role of the cementitious matrix and of aggregates over water-related behaviour of these materials can also be studied. Finally, a simple numerical model, based on experimental poromechanical results, was proposed to predict the shrinkage when the material is submitted to drying. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608001944 [article] Water desorption and shrinkage in mortars and cement pastes: Experimental study and poromechanical model [texte imprimé] / Thomas Rougelota, Auteur ; Frédéric Skoczylas, Auteur ; Nicolas Burlion, Auteur . - 2009 . - pp. 36–44. Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 1 (Janvier 2009) . - pp. 36–44 Mots-clés : Water  desorption  curves;  Cement  paste;  Mortar;  Shrinkage;Modelling Résumé : The aim of the present research was to study moisture changes and strains induced by smooth water desorption of several cement based materials. The main advantage of this small-steps drying is to dramatically limit the structural effect within tested samples, by lowering moisture gradients and therefore cracking due to differential shrinkage. Resulting data are of importance as they allow water retention curves, porosity distribution and desiccation shrinkage to be determined versus a large range of relative humidity. Experiments were conducted on ordinary mortars and cement pastes with water-to-cement ratio of 0.5 and 0.8. The role of the cementitious matrix and of aggregates over water-related behaviour of these materials can also be studied. Finally, a simple numerical model, based on experimental poromechanical results, was proposed to predict the shrinkage when the material is submitted to drying. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608001944