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Chapitre d'ouvrage

Impact of microstructure on anion exclusion in compacted clay media

Abstract : The sensitivity of ion-concentration distribution models to three key model assumptions, the pore-size distribution of clay media, the ‘distance of closest approach’ of ions to the clay surface, and the accessibility of sub-nanometer-wide clay mineral interlayer spaces to anions, was explored by solving the Poisson-Boltzmann equation for swelling and non- swelling clay materials. The calculations show that all three model assumptions impact significantly on values predicted for the anion-accessible porosity. As a consequence, macroscopic measurements of anion exclusion in clay media cannot be used to test any of the three model assumptions independently of the other two. Information gained at the nanoscale, a detailed characterization of pore-size distribution in particular, is necess- ary to develop accurate predictive models of the anion accessible porosity of clay media
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Chapitre d'ouvrage
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Contributeur : Christophe Tournassat <>
Soumis le : lundi 19 septembre 2016 - 10:27:21
Dernière modification le : mardi 8 décembre 2020 - 10:29:15

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Christophe Tournassat, Stéphane Gaboreau, Jean-Charles Robinet, Ian C. Bourg, Carl I. Steefel. Impact of microstructure on anion exclusion in compacted clay media. Thorsten Schäfer; Reiner Dohrmann; H.C. Greenwell. The Clay Minerals Society Workshop Lectures Series, 21, pp.137-149, 2016, FILLING THE GAPS – FROM MICROSCOPIC PORE STRUCTURES TO TRANSPORT PROPERTIES IN SHALES, ⟨10.1346/CMS-WLS-21.11⟩. ⟨hal-01368169⟩



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