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Water retention and gas relative permeability of two industrial concretes

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2012
auteur(s) Chen Wei; Liu Jian; Brue Flore; Skoczylas Frédéric; Davy Catherine A.; Bourbon Xavier; Talandier Jean
journal (abréviation) Cement and Concrete Research (Cement Concr Res)
volume (numéro) 42 (7)
pages 1001 – 1013
résumé This experimental study aims at identifying the water retention properties of two industrial concretes to be used for long term underground nuclear waste storage structures. Together with water retention, gas transfer properties are identified at varying water saturation level, i.e. relative gas permeability is assessed directly as a function of water saturation level Sw. The influence of the initial de-sorption path and of the subsequent re-saturation are analysed both in terms of water retention and gas transfer properties. Also, the influence of concrete microstructure upon water retention and relative gas permeability is assessed, using porosity measurements, analysis of the BET theory from water retention properties, and MIP. Finally, a single relative gas permeability curve is proposed for each concrete, based on Van Genuchten-Mualem's statistical model, to be used for continuous modelling approaches of concrete structures, both during drying and imbibition.
mots clés C. Sorption/desorption, C. Water retention, C. Permeability, E. Concrete, E.Waste management.
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