Réactivité des matériaux argileux dans un contexte de corrosion métallique : application au stockage des déchets radioactifs en site argileux

Abstract : ln order to confine radioactive wastes in deep settings, it is envisaged to use some natural clay materials and bentonites. Their stability when in contact with metallic iron, main component of the canisters, is studied. These studies show that the reactivity of such materials is mainly controlled by those of their dioctaedral smectites and kaolinites. On the contrary, the presence of sulfides stops the Fe(O)-clays reaction. The kind of reaction products depends on the quantity of available metallic iron. When pH is over 7, the Fe(O) is oxidized consecutive to a physical contact with the oxidant agents of the smectite (H+, OH- et Fe3+). This reaction is favored by the heterogeneities of the lateral surfaces of the smectite, which then describes a microenvironments in which some serpentines grow up if the iron supply is sufficient. Such new-crystallizations imply a decrease of the confinement properties of the clay barrier.
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Murielle Perronnet. Réactivité des matériaux argileux dans un contexte de corrosion métallique : application au stockage des déchets radioactifs en site argileux. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL070N⟩. ⟨tel-01749965⟩

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