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Preliminary Test on Gas Migration Through Bentonite-Sand Mixture

Published online by Cambridge University Press:  15 February 2011

T. Hokari ,
T. Ishii ,
T. Nagasawa ,
R. Tomita  and
M. Nakajima
T. Hokari
Affiliation:
Shimizu Corporation, Shibaura 1–2–3, Minato-ku, Tokyo Met, 105–07, JAPAN
T. Ishii
Affiliation:
Shimizu Corporation, Shibaura 1–2–3, Minato-ku, Tokyo Met, 105–07, JAPAN
T. Nagasawa
Affiliation:
Shimizu Corporation, Shibaura 1–2–3, Minato-ku, Tokyo Met, 105–07, JAPAN
R. Tomita
Affiliation:
KOA Development Co., Miyakocho 970–9, Chuo-ku, Chiba city, 260, Japan
M. Nakajima
Affiliation:
KOA Development Co., Miyakocho 970–9, Chuo-ku, Chiba city, 260, Japan
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Abstract

The Low-Level Radioactive Disposal facility [1] is planned to cover the vaults with impermeable bentonite-sand mixture in order to minimize groundwater flux through the facility. In case that metal wastes are to be disposed of in the burial facility in the future, it is essential to confirm that bentonite mixture should have gas permeability enough for the gas volume which would be expected to be generated due to an aerobic corrosion of metals[2]. This report performed a preliminary test with a bentonite-sand mixture whose aggregate was Japanese Standard sand. Results are the followings;(l)Gas breakthrough pressure of the mixture was less than the overburden pressure. The gas permeability was estimated to be of order of 10-2 md. (2)The mixture did not deteriorate in hydraulic conductivity after gas breakthrough.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 313
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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