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Method of Designing Bentonite/Sand Mixture to Achieve the Target Permeability

Published online by Cambridge University Press:  15 February 2011

Hitoshi Nakashima
Affiliation:
Power & Energy Project Division Shimizu Corporation.Seavans South No.2–3, Shibaura 1-chome, Minato-ku, Tokyo 105–07, Japan
Takashi Ishii
Affiliation:
Power & Energy Project Division Shimizu Corporation.Seavans South No.2–3, Shibaura 1-chome, Minato-ku, Tokyo 105–07, Japan
Tatsuro Nagasawa
Affiliation:
Power & Energy Project Division Shimizu Corporation.Seavans South No.2–3, Shibaura 1-chome, Minato-ku, Tokyo 105–07, Japan
Nobuhide Ogata
Affiliation:
Central Research Institute of Electric Power Industry, 1646 Abiko, Abikocity, Chiba 270–11, Japan
Hideo Komine
Affiliation:
Central Research Institute of Electric Power Industry, 1646 Abiko, Abikocity, Chiba 270–11, Japan
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Abstract

Bentonite/sand mixture is expected to be an effective component of barriers for radioactive waste disposal facility. Impermeable mixture can be obtained through enrichment of the bentonite content,but it is difficult to estimate a permeability of bentonite/sand mixture before permeability test. At designing of bentonite/sand mixture, we have to decide which sand to be used, and what bentonite content is. But.this means that designing will be a time-consuming task. In this report, we made many kinds of bentonite/sand mixtures using some kinds of sand with different bentonite content, and permeability tests were conducted for these mixtures. After examination of the permeability tests results, the effective void ratio of bentonite/sand mixture which was obtained by compaction test, is an efficient parameter for estimation of the permeability. Last of all, we propose the method of designing bentonite/sand mixture using the effective void ratio.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

1. Komine, H. and Ogata, N. et al. .Permeability and Mechanical Properties of Bentonite-Sand Mixtures for Sealing LLW Repositories. (Proc. 11th Intn. conf. on Structural Mechanics in Reactor Technology, Tokyo.Japan, 1992) Vol.lSDl,pp.259264.Google Scholar
2. The Method and Explanation of the Tests for Soil, edited The Japanese Society of Soil Mechanics and Foundation Engineering (Tokyo, Japan, 1990), pp.201214.Google Scholar
3. Komine, H. and Ogata, N. et al, Permeability changes of bentonite-sand mixture before and after swelling. (Proc. the annual of the Japan Society of Civil Engineers No.49, Sendai Japan, 1992), Vol.3 pp.666667.Google Scholar
4. Ogata, N. and Komine, H., Permeability changes of bentonite-sand mixture before and after swelling. (Proc. Transactions of the 12th International Conference on Structural Mechanics in Reactor Technology, Stuttgart. Germany, 1993 ), Volume N 03/3 pp.357362.Google Scholar

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