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Cement barrier action for containment of nuclear wastes is characterised by laboratory and field studies. In field studies, a range of cement types were exposed in contact with Boom clay at 25 degrees Celsius and 85 degrees Celsius for up to two years. Laboratory tests of accelerated degradation were made using electrochemically-assisted and chemical dissolution methods: both give acceleration factors of 10 to 20 compared to normal leaching.

Many of the degradation processes have been successfully modelled. Predictions of mineralogical evolution of cement in Boom clay, made in advance of experiment, were largely confirmed. Codes involving equilibrium with transport were also applied. Cracking, including crack healing and flow properties, and transport through cracks were determined experimentally and these results were also supported by modelling. Ageing of backfill materials does not significantly affect their capacity to insolubilise and adsorb actinides. Significant extensions to the thermodynamic database for cements are recorded and data obtained on the behaviour of actinide simulants in cements prepare the way to defining reactions likely to occur.

Some difficult waste streams, e.g. materials testing reactor waste, have been successfully incorporated in cement-slag matrices; characterisation data are presented on leach behaviour of active simulant/matrix combinations. ns.

Additional information

Authors: ADENOT F. ET AL, CEA, Cadarache (FR);BREDY P ET AL, ANDRA, Chatenay-Malabry (FR);BLOEM P.L.C, KEMA NV, Arnhem (NL);SNEYERS ET AL, FZ, Julich (DE);MARX ET AL, SCK-CEN, Mol (BE);BRODERSEN K, FU, Berlin (DE);COWPER M, RISO National Laboratory, Roskilde (DK);GLASSER ET AL, AEA Technology, Harwell (UK);TYRER M, University of Aberdeen, (UK)
Bibliographic Reference: EUR 19780 EN (2001), pp.333. Euro: 51.00
Availability: Available from EUR-OP Sales Agents
ISBN: ISBN: 92-894-0818-9
Record Number: 200013315 / Last updated on: 2001-06-25
Original language: en
Available languages: en
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