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Coupling Phenomena in Saturated Homo-ionic Montmorillonite: I. Experimental¹

ABSTRACT

A series of experiments was performed to observe the effects of salt concentration differences across a thin layer of homo-ionic montmorillonite. The water pressure difference, concentration difference, and voltage difference measured with electrodes reversible to the anion were observed as functions of time. A qualitative explanation of the observations is proposed.

¹ Contribution from the Dep. of Land Resource Science, Univ. of Guelph, Guelph, Ontario, Canada. The authors acknowledge support from the National Research Council of Canada.

² Professor, Principal Research Scientist, Technician, and Professional Associate, respectively. The present address of the second author is: Division of Environmental Mechanics, CSIRO, Canberra, ACT, Australia.

Received for publication August 15, 1975. Accepted for publication March 26, 1976.