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Bentonite sealing efficiency: gas transport and swelling properties - Experimental and modelling approaches

type de publication      communication internationale avec actes publiés
date de publication 20-09-2007
auteur(s) Cariou Sophie; Davy Catherine A.; Skoczylas Frédéric; Dormieux Luc; Lebon P.; Barnichon J.D.
  
conférence 3rd International Meeting on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement
     dates de 17-09-2007 à 20-09-2007
     lieu Lille, France
     nom des actes Abstracts of the 3rd International Meeting on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement (unreviewed)
  
pages 513 – 514
ISBN / ISSN none
résumé Compacted bentonite blocks are privileged candidates for sealing nuclear waste repositories (Horseman et al., 1999). Indeed, when put in place, sodium bentonite swells and thereby ensures proper sealing as in situ experiments prove (Victoria Villar et al.,2006). When dehydrating, sand addition provides resistance against shrinkage and cracking (Graham et al., 2002). Safety assessment of repositories sealing requires to fully identify bentonite swelling pressure and kinetics at given initial compaction and saturation rate. Complementarily, conditions of potential gas release from bentonite sealing plugs need being identified. Therefore, this papers presents an experimental investigation into bentonite swelling pressure and kinetics, and of its gas threshold pressure, when incorporating up to 30% sand in mass.
mots clés bentonite, argillite, interface, swelling, gas migration
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