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Pore distribution of saturated compacted montmorillonite using NMR relaxometry; Effect of salt concentration

Okubo, Takahiro*; Ibaraki, Moe*; Tachi, Yukio  ; Iwadate, Yasuhiko*

1H NMR relaxometry was applied for investigation of pore structure in compacted saturated montmorillonite with different salt concentration. The samples compacted to dry densities of 0.8 and 1.2 g/cm$$^{3}$$ were saturated with pure water, 0.05, 0.10, 0.50, and 1.0 M NaCl solutions. Population of water in different hydrated layer corresponding to 1-, 2-, and 3 hydrated layer was estimated from longitudinal relaxation distributions. The population of water in 1-, 2-, and 3 hydrated layers changed as a function of NaCl concentration. The threshold to discriminate between inter- and intra-layer water is 3 hydrated layer, which is questionable from existence of 4 hydrated layer revealed by modelling of X-ray profile. The amount of water in 1- and intra-layer were negligible small for all conditions at dry density of 1.2 g/cm$$^{3}$$. On the other hand, water in 2-hydrated layer was decreased instead of increment of water in 3-hydrated layer.

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