PHASE COMPOSITION OF FROZEN MONTMORILLONITE-WATER MIXTURES FROM HEAT CAPACITY MEASUREMENTS.

• Main Author: Anderson,Duwayne M.
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
• Format: Text
• Language: English
• Published: 1967
• Subjects: Soil Mechanics; Snow; Ice and Permafrost; Civil Engineering; (*MONTMORILLONITE; PHASE STUDIES); (*SOILS; FREEZING); ICE; WATER; EQUATIONS OF STATE; SPECIFIC HEAT; CALORIMETRY; HEAT CAPACITY; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/AD0656601; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0656601

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 -9.6C 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 -5C. The amount of unfrozen water found in the frozen clay-water mixtures at -5 to -10C 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. (Author)