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

Matti Valkiainen, Markus Olin, Kari Uusheimo, Heikki Kumpulainen, Jarmo Lehikoinen, Arto Muurinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    2 Citations (Scopus)


    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.
    Original languageEnglish
    Title of host publicationSymposium V – Scientific Basis for Nuclear Waste Management XVI
    EditorsC.G. Interrante, R.T. Pabalan
    Place of PublicationPittsburgh
    PublisherMaterials Research Society
    Publication statusPublished - 1992
    MoE publication typeB3 Non-refereed article in conference proceedings

    Publication series

    SeriesMRS Online Proceedings


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