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Impact of microstructure on anion exclusion in compacted clay media

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Résumé

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. Our calculations show that all three model assumptions significantly impact 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 two others. Information gained at the nanoscale,in particular, a detailed characterization of pore size distribution, is necessary to develop accurate predictive models of the anion accessible porosity of clay media.
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Dates et versions

hal-01137606 , version 1 (31-03-2015)

Identifiants

  • HAL Id : hal-01137606 , version 1

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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. Euroclay 2015, Clay Mineral Society, Jul 2015, Edinburgh, United Kingdom. ⟨hal-01137606⟩

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