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The objective of this tri-coordinated research programme was to determine the interactions between radioactive waste and cementitious materials, in real waste forms, and also to explain the sorption phenomena of transuranics and relate laboratory data to the performance of realistic cemented waste forms within a repository.
The stability and sorptive capacities of the principal hydration products of cement, blended cements and of the 'reference vault' backfill were investigated. These included: C-S-H (calcium silicate hydrate) gel; ettringite; hydrotalcite; tobermorite and calcium aluminate hydrates, studied in double distilled water; saturated sodium chloride solution and Q-brine at 25 C to 80 C. The above cement hydrates are able to condition relatively high aqueous pH's which in turn lead to low actinide solubility.
It was found that the solubility of the actinides studied was not increased when organics were added to cements. Only when a very large, unrealistic, loading of organics is used is there a small increase in solubility. A 3% loading in cellulose shows no increase in Pu solubility after five months, whereas, at 9% loading there is a two-fold increase in Pu solubility. .

Additional information

Authors: GLASSER F P ET AL, University of Aberdeen (GB);ALTENHEIN-HAESE C ET AL, Freie Universität Berlin (DE);AGGARWAL S ET AL, AEA Windscale, Seascale (GB);CSETENYI L ET AL, University of Veszprém (HU)
Bibliographic Reference: EUR 16942 EN (1996) 272pp., FS, ECU 30
Availability: Available from the (2)
ISBN: ISBN 92-827-7859-2
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