SATURATION, PHASE COMPOSITION AND FREEZING POINT DEPRESSION IN A RIGID SOIL MODEL.

• Main Authors: Lange,G. Robert, McKim,Harlan L.
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
• Format: Text
• Language: English
• Published: 1967
• Subjects: Physical Chemistry; Soil Mechanics; *SOIL MECHANICS; *MATHEMATICAL MODELS; *FREEZING; SOILS; PERMAFROST; TEST EQUIPMENT; CERAMIC MATERIALS; ICE; HEAT OF FUSION; PERCEPTION; MODEL TESTS; WETTING; THERMAL ANALYSIS; SAMPLING; SCIENTIFIC RESEARCH; CALORIMETRY; FREEZING POINT; HEAT OF WETTING; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/AD0664141; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0664141

Calorimetry was used to explore the effects of saturation and temperature upon the phase composition of the water at below freezing temperatures in a porcelain block with fine pore spaces. The effect of pore size upon phase composition was held constant by the rigid model. The percent of original water frozen was determined for a wide range of saturations and several temperature levels. Nucleation was avoided. After 20 hr of freezing, 64 of 74 determinations showed less than 10% or more than 70% of the water frozen. Thus, a metastable condition of saturation and temperature for guaranteed freezing was defined for the pore space model with time of freezing held constant. Freezing points were also measured at various levels of saturation in the same porcelain blocks. A range of effective pore sizes was calculated from these data, thus characterizing the pore size distribution. Both freezing point depression and guaranteed freezing data, when plotted against saturation, appear to conform to an empirical relationship. (Author)