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Modelling the Sorption of Actinides onto Cement: An Approach with the Surface Co-Precipitation Model

Published online by Cambridge University Press:  11 February 2011

Daisuke Sugiyama  and
Tomonari Fujita
Daisuke Sugiyama
Affiliation:
Central Research Institute of Electric Power Industry (CRIEPI), 2–11–1, Iwado-Kita, Komae, Tokyo 201–8511, Japan.
Tomonari Fujita
Affiliation:
Central Research Institute of Electric Power Industry (CRIEPI), 2–11–1, Iwado-Kita, Komae, Tokyo 201–8511, Japan.
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Abstract

An approach, assuming that co-precipitation on the surface of the cement phase dominates ‘sorption’, is proposed and discussed to interpret the sorption behaviour of the cement-complex system. This model takes account of the mineralogical composition of Ordinary Portland Cement (OPC) and assumes that Calcium Silicate Hydrates (C-S-H) dominates the sorption (fixation) of actinide onto OPC and that a small amount of surface co-precipitation of actinides with calcium hydroxide in the structure of C-S-H is formed during the late period of the fixation process. Therefore, this will be referred to as the ‘Surface Co-Precipitation Model (SCPM)’. The modelling results show generally good agreement between the predicted and measured distribution ratios of plutonium, thorium and neptunium, of which the dominant species in high pH solution are neutral species, on OPC.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II3.10
Copyright
Copyright © Materials Research Society 2003

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References

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