Are deicing salts necessary to promote scaling in concrete? / Antonin Fabbri in Journal of engineering mechanics, Vol. 134 N° 7 (Juillet 2008)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 134 N° 7 (Juillet 2008) . - pp.589-598 Titre : Are deicing salts necessary to promote scaling in concrete? Type de document : texte imprimé Auteurs : Antonin Fabbri, Auteur ; Olivier Coussy, Auteur ; Teddy Fen-Chong, Auteur Année de publication : 2010 Article en page(s) : pp.589-598 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Coupling Durability Pressures Thermoelasticity Spalling. Résumé : The main purpose of the present study is to investigate the role of the material parameters such as permeability, thermal diffusivity, and pore size distribution on the mechanical behavior of cementitious structures submitted to frost action, such as surface scaling. An experimental device, in which a cement paste specimen is exposed to freezing-thawing cycles under a thermal gradient, has been developed. The experimental results show that under high thermal gradient (up to 1.5°C/mm), skin damage can occur without a saline layer in contact with the frozen surface. This can be explained and quantified in the framework of poromechanics. The model is based on the coupling between liquid-ice crystal thermodynamic equilibrium, liquid water transport, thermal conduction, and elastic properties of the different phases that form the saturated porous material. It eventually predicts that a less permeable sample is more susceptible to damage by surface defacement, which explains the observed experimental result. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v134/i7/p589_s1?isAuthorized=no [article] Are deicing salts necessary to promote scaling in concrete? [texte imprimé] / Antonin Fabbri, Auteur ; Olivier Coussy, Auteur ; Teddy Fen-Chong, Auteur . - 2010 . - pp.589-598. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N° 7 (Juillet 2008) . - pp.589-598 Mots-clés : Coupling Durability Pressures Thermoelasticity Spalling. Résumé : The main purpose of the present study is to investigate the role of the material parameters such as permeability, thermal diffusivity, and pore size distribution on the mechanical behavior of cementitious structures submitted to frost action, such as surface scaling. An experimental device, in which a cement paste specimen is exposed to freezing-thawing cycles under a thermal gradient, has been developed. The experimental results show that under high thermal gradient (up to 1.5°C/mm), skin damage can occur without a saline layer in contact with the frozen surface. This can be explained and quantified in the framework of poromechanics. The model is based on the coupling between liquid-ice crystal thermodynamic equilibrium, liquid water transport, thermal conduction, and elastic properties of the different phases that form the saturated porous material. It eventually predicts that a less permeable sample is more susceptible to damage by surface defacement, which explains the observed experimental result. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v134/i7/p589_s1?isAuthorized=no

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