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Mass Transport of Multicomponents Solute in Bentonite Clay

Published online by Cambridge University Press:  21 March 2011

Y. Ichikawa ,
K. Kawamura ,
M. Nakano ,
K. Kitayama ,
N. Saito ,
H. Kawamura  and
S. Yamamoto
Y. Ichikawa
Affiliation:
Nagoya University, Nagoya 464-8603, Japan; Email: YIchikawa@nucc.cc.nagoya-u.ac.jp
K. Kawamura
Affiliation:
Tokyo Institute of Technology, Tokyo 152-8551, Japan; Email: kats@geo.titech.ac.jp
M. Nakano
Affiliation:
Kobe University, Nada-ku, Kobe 657-8501, Japan; Email: nakano@ans.kobe-u.ac.jp
K. Kitayama
Affiliation:
Tokyo Electric Power Co., Chiyoda-ku, Tokyo 100-0011, Japan
N. Saito
Affiliation:
Tokyo Electric Power Co., Chiyoda-ku, Tokyo 100-0011, Japan
H. Kawamura
Affiliation:
Obayashi Co., Minato-ku, Tokyo 108-8502, Japan
S. Yamamoto
Affiliation:
Obayashi Co., Minato-ku, Tokyo 108-8502, Japan
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Abstract

A fundamental concept combining a molecular behavior and macro-continuum phenomenon is presented for a multicomponent solute diffusion problem in bentonite clay, which is a key component of the Engineering Barrier System (EBS) of high-level radioactive waste disposal (HLRW). Bentonite is a micro-inhomogeneous material. Properties of the saturated bentonite are characterized by the constituent clay mineral (montmorillonite) and water, namely montmorillonite hydrate. We analyze its molecular behavior by applying a molecular dynamics (MD) simulation to inquire into the physicochemical properties such as diffusivity of chemical species. For extending the microscopic characteristics of constituent materials to a macroscopic diffusion behavior of the micro-inhomogeneous material we apply a homogenization analysis (HA).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 617
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1. Ichikawa, Y., Kawamura, K., Nakano, M., Kitayama, K., Kawamura, H. (1999): “Unified molecular dynamics and homogenization analysis for bentonite behavior”, Engineering Geology, 54, 21–31.Google Scholar
2. Kawamura, K., Ichikawa, Y., Nakano, M., Kitayama, K., Kawamura, H. (1997): “New approach for predicting the long term behavior of bentonite”, Proc.Sci.Basis for Nuclear Waste Management XXI, Davos, Swizerland, Material Research Society, Warrendale PA, 359–366.Google Scholar
3. Sanchez-Palencia, E. (1980); Non-Homogeneous Media and Vibration Theory, Springer-Verlag.Google Scholar