Accession Number : AD0714644

Title :   Effect of Thermal Gradient on Ionic Diffusion in Frozen Earth Materials. I: Experimental.

Descriptive Note : Research rept.,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Murrmann,Richard P. ; Hoekstra,Pieter

Report Date : SEP 1970

Pagination or Media Count : 14

Abstract : Ionic concentration and water profiles in frozen bentonite samples subject to a thermal gradient of 0.3C/cm but different temperature intervals were obtained in the temperature range from 0C to -12C in order to determine the extent to which thermal gradients influence the movement of ions in thin films of interfacial water. The moisture content distribution was found to remain virtually unchanged after times ranging from 20 to 54 days, indicating that ionic movement was not affected by mass flow of mobile water in thin films. The ionic distribution profiles were essentially as expected in the absence of a temperature gradient. These observations support the conclusion that thermal gradients have little influence on redistribution of ions in frozen earth materials. (Author)

Descriptors :   (*SOILS, DIFFUSION), (*CLAY MINERALS, *IONS), FREEZING, SALTS, SODIUM, ICE, WATER, TEMPERATURE

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE