The Water‐Ice Phase Composition of Clay‐Water Systems: I. The Kaolinite‐Water System

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Abstract
Previous work has indicated that when water‐ice phase composition curves are normalized to unit surface area, unfrozen water content values at all temperatures are higher for the kaolinite‐water system than for other clay‐water systems. In addition, the water‐ice phase composition curve for this system appeared to be the resultant of the superposition of two power curves of the form Wu = αθβ. The measurements have been repeated using an improved isothermal calorimeter and the earlier results confirmed. Values of Wu per unit surface area for the kaolinite‐water systems are more than twice as large as those for the montmorillonite‐water systems. Addition of polyox (polyethylene oxide) to the kaolinite‐water system had little effect on Wu in the range of 0 < θ < 1.7 but diminished Wu significantly at values of θ > 1.7. The observations are explained qualitatively in terms of a domain model of clayimbibed water.

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