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Etude expérimentale de l'hydratation des smectites par simulation des raies 00ℓ de diffraction des rayons X. Implications pour l'étude d'une perturbation thermique sur la minéralogie de l'argilite du site Meuse-Haute Marne

Abstract : The structural modifications affecting the reactive mineral constituents of the clay barriers (smectite) and possibly resulting from the thermal pulse related to nuclear waste storage are essentially limited to the amount and location of the layer charge deficit. These modifications likely impact the hydration properties of these minerals, and a specific methodology has thus been developed to describe, using simulation of X-ray diffraction profiles (00ℓ reflections), these hydration properties and specifically the heterogeneity resulting from the interstratification of different layer types, each exhibiting a specific hydration state. The detailed study of the hydration properties of a low-charge montmorillonite (octahedral charge) has shown that the affinity of the interlayer cation for water rules the hydration state and the thickness of hydrated smectite layers. If the layer charge is increased, the transition between the different hydration states is shifted, following a water desorption isotherm, towards lower relative humidities. In addition, the hydration of studied beidellites (tetrahedral charge) was shown to be more heterogeneous than that of montmorillonites. The developed methodology also allowed describing the structural modifications resulting from a chemical perturbation (chlorinated anionic background, pH). Finally, the link between the thickness of elementary layers and the amount of interlayer water molecules has been evidenced. A new structure model has also been determined for these interlayer species allowing an improved description of their positional distribution in bihydrated interlayers.
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https://tel.archives-ouvertes.fr/tel-00008341
Contributor : Bruno Lanson <>
Submitted on : Thursday, February 3, 2005 - 9:47:39 AM
Last modification on : Tuesday, November 24, 2020 - 11:00:13 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:48:22 PM

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  • HAL Id : tel-00008341, version 1

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Eric Ferrage. Etude expérimentale de l'hydratation des smectites par simulation des raies 00ℓ de diffraction des rayons X. Implications pour l'étude d'une perturbation thermique sur la minéralogie de l'argilite du site Meuse-Haute Marne. Matériaux. Université Joseph-Fourier - Grenoble I, 2004. Français. ⟨tel-00008341⟩

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