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A Comparative study by conductivity measurement of polarisation of hydratation mechanism of bentonites

Author(s): A.Sassi, Z.Derriche, A.Djebaili, J.C.Giuntini

The conductivity of polarisation was measured at equilibrium with a water vapour pressure ranging from1kHz to 1MHz; the temperaturewasmaintained constant at 298°K all along this study. The measurements were then monitored by the relative water vapour pressure (P/Po).We notice thatwater adsorption creates in the sample a significant increase in dipole number. This study allows showing transport proprieties in these disorder solids. During bentonite hydratation and under the influence of compensator cations (Na+ and Ca++), the swelling phenomenon affects considerably the conductivity.

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