Swelling Pressure in Expansive Porous Media Derived from Nano/Macro Homogenization Including Ion Size Correlation Effects

Abstract : In the case of electrically charged porous media as clays, a precise definition of swelling pressure has already been given in our preceding works using the periodic homogenization medium for two scales (nano/macro) (Moyne and Murad, 2002, 2006). The modeling at the nanoscale is based on the Poisson-Boltzmann equation to describe the electrostatics. However, for montmorillonite clays, if for a monovalent compensating cation (eg Na), swelling is always observed. For divalent ions (eg Ca or ions of higher valence), on the contrary, shrinking phenomena can be observed. As the Poisson-Boltzmann equation always predicts swelling, a more precise description of the physics at the nanopore level is needed. Therefore, a pore-scale model is developed within the framework of Statistical Mechanics in conjunction with a thermodynamic approach based on Density Functional Theory.
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Communication dans un congrès
Christian Hellmich; Bernhard Pichler; Dietmar Adam. Fifth Biot Conference on Poromechanics, Jul 2013, Vienne, Austria. American Society of Civil Engineers, pp.9780784412992, 2013, Poromechanics V: Proceedings of the Fifth Biot Conference on Poromechanics. 〈10.1061/9780784412992.208〉
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Soumis le : lundi 23 janvier 2017 - 10:56:39
Dernière modification le : jeudi 11 janvier 2018 - 06:27:33

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Tien-Dung Le, Christian Moyne, Marcio A. Murad, Sidarta A. Lima. Swelling Pressure in Expansive Porous Media Derived from Nano/Macro Homogenization Including Ion Size Correlation Effects. Christian Hellmich; Bernhard Pichler; Dietmar Adam. Fifth Biot Conference on Poromechanics, Jul 2013, Vienne, Austria. American Society of Civil Engineers, pp.9780784412992, 2013, Poromechanics V: Proceedings of the Fifth Biot Conference on Poromechanics. 〈10.1061/9780784412992.208〉. 〈hal-01443472〉

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