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Diffusivity and Porosity in Rock Matrix—Laboratory Methods Using Artificial and Natural Tracers

Published online by Cambridge University Press:  01 January 1992

M. Valkiainen ,
M. Olin ,
K. Uusheimo ,
H. Kumpulainen ,
J. Lehikoinen  and
A. Muurinen
M. Valkiainen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, P.O. Box 200, SF-02151 Espoo, Finland
M. Olin
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, P.O. Box 200, SF-02151 Espoo, Finland
K. Uusheimo
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, P.O. Box 200, SF-02151 Espoo, Finland
H. Kumpulainen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, P.O. Box 200, SF-02151 Espoo, Finland
J. Lehikoinen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, P.O. Box 200, SF-02151 Espoo, Finland
A. Muurinen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, P.O. Box 200, SF-02151 Espoo, Finland
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Abstract

The nature of diffusivity and porosity in crystalline rock was studied by electrical conductivity measurements, steady-state diffusion experiments, saturation-leaching of tracers with cylindrical rock samples and analysis of the concentrations of different elements from core samples or pore water near fractures. The phenomena of main interest were dead-end porosity, ion-exclusion, sorption, and the continuity of pore networks. The modelling of experimental results was based on a modified Fick's second law for diffusion, which was solved either by analytical or numerical methods. The measured De and ε were found to statistically follow an exponential presentation: Archie's law. The existence of ion-exclusion for anions was confirmed. The connectivity of the pore network extended in the laboratory experiments at least six centimetres, in coarse-grained granite in nature several metres but in fine-grained rock samples of a uranium deposit the element mobilization effects could be seen only to the depth of 2–3 centimetres.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 845
Copyright
Copyright © Materials Research Society 1993

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References

REFERENCES

1. Valkiainen, M., Uusheimo, K., Olin, M., and Muurinen, A. in Scientific Basis for Nuclear Waste Management XV, edited by Sombret, C.G., (Mater. Res. Soc. Proc. 257, Pittsburgh, PA, 1992), pp. 675–682.Google Scholar
2. Kumpulainen, H., Muurinen, A., and Uusheimo, K. in Scientific Basis for Nuclear Waste Management XIV, edited by Abrajano, T. Jr., and Johnson, L.H., (Mater. Res. Soc. Proc. 212, Pittsburgh, PA, 1991), pp. 655–660.Google Scholar
3. Olin, M. and Valkiainen, M., Concentration Profiles of Anions in Granite Bedrock Caused by Postglacial Landuplift and Matrix Diffusion, IVO Technical Report 90–1, 1990.Google Scholar
4. Parkhomenko, E.I., Electrical Properties of Rocks (Plenum Press, New York, 1967), p. 268.Google Scholar
5. Suksi, J., Ruskeeniemi, T. in Palmottu Analogue Proiect Progress Report 1990, edited by Blomqvist, R., Jaakkola, T., Niini, H., and Ahonen, L. (Geological Survey of Finland, Report YST-73, Espoo, Finland, 1991), pp. 47 - 58.Google Scholar
6. Smellie, J.A.T., MacKenzie, A.B. and Scott, R.D., Chem. Geol. 55, 233–254 (1986).Google Scholar