Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-29T07:36:40.389Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Aggarwal, S., Angus, M.J., Tyson, A. Waste Management, 2, 399. 1990.Google Scholar
2. Ewart, F.T., and all. DOE Report No: DOE/RW/90/065.1990 Google Scholar
3. AB, Kemakta Konsult. NAGRA Technical Report, 88. 1989 Google Scholar
4. Pointeau, I., Thesis, 2000.Google Scholar
5. Parkhurst, D.L., , U.S.G.S. Water-Resources Investigations Report 95-4227. 1995.Google Scholar
6. Klur, I., Pollet, B., Virlet, J. and Nonat, A. Nuclear Magnetic Resonance Spectroscopy of cement-based Materials,119. 1998.Google Scholar
7. Hamid, S.A. Zeitschrift für Kristallographie, 154, 189. 1981.Google Scholar
8. Glasser, F.P., and al., Characterization and performance of cementitious products in radioactive waste repositories. Fourth European Conference on Management and Disposal of Radioactive Waste. Ed. McMenamin, T.. ISSN 1018-5593, pp 179. 1996.Google Scholar