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Mortar-Radwaste Mixture Form Characterization Due to 137Cs Leach-Rate Using Accelerated Ageing Processes

Published online by Cambridge University Press:  25 February 2011

Aleksandar D.Perić ,
Ilija B.Plećaš ,
Radojko S.Pavlović  and
Snežana D.Pavlović
Aleksandar D.Perić
Affiliation:
Institute of Nuclear Sciences “Vinča”, Belgrade, Yugoslavia
Ilija B.Plećaš
Affiliation:
Institute of Nuclear Sciences “Vinča”, Belgrade, Yugoslavia
Radojko S.Pavlović
Affiliation:
Institute of Nuclear Sciences “Vinča”, Belgrade, Yugoslavia
Snežana D.Pavlović
Affiliation:
Institute of Nuclear Sciences “Vinča”, Belgrade, Yugoslavia
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Abstract

Series of mortar-radwaste mixture samples, orthocylinder shaped, with the external surface completely open to contact with leachant medium, were investigated in experiments that tried to characterize long-term physico-chemical and mechanical properties of the matrix material. After curing period of 28 days in the atmosphere of defined parameters, one group of the samples was treated on leaching in the distilled water for a one year period, to establish the 137Cs cumulative leached fraction. The second group of the samples of the same batch as the first one, after one year curing period , was investigated under temperature stress conditions. The values of the temperature climaxes were: Tmin=-20°C and Tmax=+70°C. Samples were periodically immersed in distilled water at the room temperature, after each freezing and heating treatment. The experimental goal was to bring mortar-radwaste mixture forms, during a short period of experimental time, into the state that has nearly the same physico-chemical properties, mainly radionuclide leach-rate, as the first sample group has, which was treated in the normal one-year leaching process. Data obtained from these investigations, using accelerated ageing processes, do not correspond completely to the appropriate values that could define the state of the samples treated excusively in the leachant medium. Nevertheless, accelerated ageing processes are suitable for the relatively fast estimation of immobilizing properties of mortar matrices, and their behaviour in the extended experimental time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 333: Symposium V – Scientific Basis for Nuclear Waste Management XVII , 1993 , 377
Copyright
Copyright © Materials Research Society 1994

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References

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