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Effect of Swelling Pressure on Local Volume Change in Unsaturated Sand-Bentonite Buffer Material

Published online by Cambridge University Press:  15 February 2011

Shooshpasha I ,
Mohamed A.M.O  and
R. N. Yong
Shooshpasha I
Affiliation:
Geotechnical Research Centre, McGill University 817 Sherbrooke St. West, Montreal, Canada H3A 2K6 Onofrei, C. AECL Research, Whiteshell Laboratories, Manitoba, Canada ROE 1L0, Pinawa
Mohamed A.M.O
Affiliation:
Geotechnical Research Centre, McGill University 817 Sherbrooke St. West, Montreal, Canada H3A 2K6 Onofrei, C. AECL Research, Whiteshell Laboratories, Manitoba, Canada ROE 1L0, Pinawa
R. N. Yong
Affiliation:
Geotechnical Research Centre, McGill University 817 Sherbrooke St. West, Montreal, Canada H3A 2K6 Onofrei, C. AECL Research, Whiteshell Laboratories, Manitoba, Canada ROE 1L0, Pinawa
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Abstract

This study was designed to investigate the effect of swelling pressure on local volume changes in unsaturated sand-bentonite based buffer material. A laboratory mixture of sodium bentonite and graded silica sand in equal proportion by dry weight was used in both ambient and elevated temperatures experiments. At high water content locations within the tested specimens, the density was reduced by 3.57% from its initial values due to swelling. The swelling pressure as a function of distance was calculated by 4 different models. The calculated results have indicated that the density distribution within the specimen is affected by swelling potential distribution. The calculated swelling pressure values vary as a function of water content, reaching 1 MPa at the source of water intake, i.e., at high water content zone, and 2 MPa at the heater side, i.e., at low water content zone.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 667
Copyright
Copyright © Materials Research Society 1996

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