Article Dans Une Revue Applied Clay Science Année : 2025

Effect of water saturation on the diffusive transport of water and solutes in compacted kaolinite, illite and vermiculite

Résumé

Through-diffusion experiments were carried out under partially water saturated conditions and using uncharged tracers (HTO and HDO; water molecule with one tritium and deuterium atom, respectively), negatively charged tracers (125I and 36Cl) and positively charged tracer (22Na+) in two reference clayey materials: (i) illite, a negatively-charged clay mineral with only interparticle porosity and (ii) vermiculite, a negatively-charged clay mineral with both inter-particle and interlayer porosities. For both types of porous media, a sharp decrease in diffusive flux was observed for all three types of tracer when water saturation (Sw) was reduced from Sw = 0.95 to 0.88. The data were compared to those obtained previously with porous media made of kaolinite, a weakly-charged clay mineral having only inter-particle porosity, to quantify the relative influences of surface charge and pore geometry/pore size distribution on diffusion properties as a function of water saturation. The latter parameter had a prominent role on the diffusional properties in the investigated range of Sw, regardless of the type of clayey material. Then, a relationship predicting diffusivities of cation under partially water saturated conditions as a function of diffusivities of anion at the same level of water saturation is proposed for the reference clayey materials investigated.

Dates et versions

insu-05212963 , version 1 (18-08-2025)

Identifiants

Citer

Lucas Désert, Sébastien Savoye, Eric Ferrage, Fabien Hubert, Pierre Henocq, et al.. Effect of water saturation on the diffusive transport of water and solutes in compacted kaolinite, illite and vermiculite. Applied Clay Science, 2025, 276, pp.107928. ⟨10.1016/j.clay.2025.107928⟩. ⟨insu-05212963⟩
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