Impacts multi-échelles d'un échange (Mg, Ca)-Pb et ses conséquences sur l'augmentation de la perméabilité d'une bentonite.

Nevila Jozja (1) , Patrick Baillif (1) , Jean-Claude Touray (1) , Charles-Henri Pons (1) , Fabrice Muller (1) , Carole Burgevin (1)

1 ISTO - Institut des Sciences de la Terre d'Orléans

The article addresses the structural effects of solutions of lead nitrate on a suspended or compacted bentonite. A permeability increase is observed on compacted clay. Investigating the composition of output solution, using X-Rays Diffusion at Small Angles and Scanning Electron Microscopy, this permeability increase is explained from structural variations at nanometric (reduction of particle size) and micrometric scales (microfissuration of aggregates).

Keywords: bentonite; échange d'ions; perméabilité; Pb2+Mots-clé: bentonite; ion exchange; permeability; Pb2+

Domains: Sciences of the Universe [physics]; Earth Sciences; Mineralogy

Nevila Jozja, Patrick Baillif, Jean-Claude Touray, Charles-Henri Pons, Fabrice Muller, et al.. Impacts multi-échelles d'un échange (Mg, Ca)-Pb et ses conséquences sur l'augmentation de la perméabilité d'une bentonite.. Comptes Rendus Géoscience, 2003, 335, pp.729-736. ⟨10.1016/S1631-0713(03)00129-9⟩. ⟨hal-00069451⟩