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Linear and non-linear analysis of desorption processes in cement mortar / Halina Garbalińska in Cement and concrete research, Vol. 40 N° 5 (Mai 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 5 (Mai 2010) . - pp.752–762 Titre : Linear and non-linear analysis of desorption processes in cement mortar Type de document : texte imprimé Auteurs : Halina Garbalińska, Auteur Année de publication : 2012 Article en page(s) : pp.752–762 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Drying  ;  Humidity  ;  Diffusion  ;  Transport  properties  ;  Mortar Résumé : Based on the gathered experimental data concerning adsorption/desorption processes in cement mortar, it has been stated that the rate of these processes changes in time even if they proceed in stable conditions. In this paper an attempt is made to describe such processes by applying linear and non-linear diffusion theories for comparison. The main aim of these studies is to determine the diffusion coefficient by correlating the theoretically determined desorption isotherms with the experimental ones. The validation of the diffusion coefficient was accomplished through comparison of the theoretical desorption curves with the experimental data for narrow and broad ranges of the air humidity changes. The final conclusion is that the moisture transfer in hygroscopic porous materials for broad ranges of the air humidity changes should be modeled by the non-linear diffusion theory, in which the diffusion coefficient is a function of moisture content. The new material in this paper concerns very long time measurements in desiccators, and evaluation of the diffusion coefficient by an advanced optimization algorithm. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609003512 [article] Linear and non-linear analysis of desorption processes in cement mortar [texte imprimé] / Halina Garbalińska, Auteur . - 2012 . - pp.752–762. Bibliogr. Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 5 (Mai 2010) . - pp.752–762 Mots-clés : Drying  ;  Humidity  ;  Diffusion  ;  Transport  properties  ;  Mortar Résumé : Based on the gathered experimental data concerning adsorption/desorption processes in cement mortar, it has been stated that the rate of these processes changes in time even if they proceed in stable conditions. In this paper an attempt is made to describe such processes by applying linear and non-linear diffusion theories for comparison. The main aim of these studies is to determine the diffusion coefficient by correlating the theoretically determined desorption isotherms with the experimental ones. The validation of the diffusion coefficient was accomplished through comparison of the theoretical desorption curves with the experimental data for narrow and broad ranges of the air humidity changes. The final conclusion is that the moisture transfer in hygroscopic porous materials for broad ranges of the air humidity changes should be modeled by the non-linear diffusion theory, in which the diffusion coefficient is a function of moisture content. The new material in this paper concerns very long time measurements in desiccators, and evaluation of the diffusion coefficient by an advanced optimization algorithm. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609003512