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Cesium and Lead Uptake by CSH Phases of Hydrated Cement

Published online by Cambridge University Press:  21 March 2011

I. Pointeau ,
N. Marmier ,
F. Fromage ,
M. Fedoroff  and
E. Giffaut
I. Pointeau
Affiliation:
Groupement de Recherche en Chimie Inorganique, Université de Reims, GRECI BP1039, 51687 REIMS Cedex, France Agence Nationale pour la gestion des Déchets Radioactifs, 1/7 rue Jean-Monnet, 92298 Châtenay-Malabry Cedex
N. Marmier
Affiliation:
Groupement de Recherche en Chimie Inorganique, Université de Reims, GRECI BP1039, 51687 REIMS Cedex, France Email: [email protected]
F. Fromage
Affiliation:
Groupement de Recherche en Chimie Inorganique, Université de Reims, GRECI BP1039, 51687 REIMS Cedex, France
M. Fedoroff
Affiliation:
Centre d'Etude de Chimie Métallurgique, Centre National de la Recherche Scientifique, 15 rue Georges Urbain, 94407 Vitry-sur-Seine, France
E. Giffaut
Affiliation:
Agence Nationale pour la gestion des Déchets Radioactifs, 1/7 rue Jean-Monnet, 92298 Châtenay-Malabry Cedex
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Abstract

As Kd from radwaste elements in concrete systems show a wide range of values, a modelling of cesium and lead immobilization in Calcium Silicate Hydrate (CSH, xCaO.SiO2.H2O, with 0.7 (aged cements)<Ca/Si<1.8 (fresh cements)) matrix has been developed. This model accounts for radwaste surface binding mechanisms on silanol sites (>SiOH) and precipitation equilibria. Values of Kd from cesium and lead in CSH matrix can thus be calculated with Ca/Si evolution and ionic strength effect. Predictive calculations have been carried out with success with different Ca/Si ratios, ionic strengths and liquid/solid ratios, and results are well superimposed with experimental isotherm data. If the CSH really allow accounting for the radwaste behavior in hydrated cement matrices, this model can be used in safety assessment calculations, with varying pH and [Ca2+] as cement degradation state parameters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 97
Copyright
Copyright © Materials Research Society 2001

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References

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