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Experimental Study on Self-Healing of Bentonite / Sand Mixtures and its Impact on Hydraulic Permeability

Published online by Cambridge University Press:  03 September 2012

Toshiyuki Hokari ,
Mitsunobu Okihara ,
Takashi Ishii  and
Keiji Kojima
Toshiyuki Hokari
Affiliation:
Shimizu Corporation, Power & Energy Project Div., 1–2–3 Shibaura, Minato-ku, Tokyo 105–07, Japan
Mitsunobu Okihara
Affiliation:
Shimizu Corporation, Power & Energy Project Div., 1–2–3 Shibaura, Minato-ku, Tokyo 105–07, Japan
Takashi Ishii
Affiliation:
Shimizu Corporation, Power & Energy Project Div., 1–2–3 Shibaura, Minato-ku, Tokyo 105–07, Japan
Keiji Kojima
Affiliation:
University of Tokyo, Dept. of Geosystem Engineering, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113, Japan
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Abstract

The effects of gas permeation on the hydraulic permeability of bentonite/sand mixtures were studied experimentally by conducting permeability tests with various fluids and by microscopic observations. In these tests, hydraulic permeabilities were measured before and after helium gas was applied to permeate the mixtures.

Although gas formed preferential migration paths through the mixtures, the imperviousness of the bentonite/sand mixtures to the tested fluids never deteriorated because the paths became filled by swelling bentonite on re-saturation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 971
Copyright
Copyright © Materials Research Society 1997

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References

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