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Title: Phase composition of frozen montmorillonite-water mixtures from heat capacity measurements
Authors: Anderson, Duwayne M. (Duwayne Marlo), 1927-
Keywords: Soils
Clay soils
Soil solutions
Soil solutions freezing
Soil freezing
Phase transition
Soil moisture content
Temperature factors
Frozen ground
Frozen soils
Unfrozen water content
Heat measurement
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Research report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 218.
Description: Research Report
Abstract: Equations are presented which form the basis of a method for determining the unfrozen water content of frozen clay-water mixtures from heat capacity measurements. The heat capacity of frozen sodium-montmorillonite water mixtures was determined at -4.7 and -9.6°C with a Calvet Microcalorimeter. The data were then used in conjunction with the method described to obtain the unfrozen water content of these clay water mixtures. The data obtained indicate that the method is applicable at temperatures below about -5°C. The amount of unfrozen water found in the frozen clay-water mixtures at -5 to -10°C is equivalent to an interfacial surface layer of water of from one to two molecular diameters in thickness. Most of this water can be accommodated and is thought to be located in interlamellar regions.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Research Report

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