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Modelling The Alteration of Son-68 Glass with Nearfield Materials

Published online by Cambridge University Press:  21 March 2011

G. de Combarieu ,
P. Barboux ,
N. Godon ,
Y. Minet  and
S. Gin
G. de Combarieu
Affiliation:
VRH/DTCD/SECM/LCLT, CEA Valrhô, site de Marcoule, France
P. Barboux
Affiliation:
LCAES-CNRS UMR 7574, ENSCP, Paris, France
N. Godon
Affiliation:
VRH/DTCD/SECM/LCLT, CEA Valrhô, site de Marcoule, France
Y. Minet
Affiliation:
VRH/DTCD/SECM/LCLT, CEA Valrhô, site de Marcoule, France
S. Gin
Affiliation:
VRH/DTCD/SECM/LCLT, CEA Valrhô, site de Marcoule, France
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Abstract

The model tested in this paper couples glass dissolution rate and geochemistry in the surrounding environment, thus leading to the comprehensive description of the interactions between the glass and the minerals and their transformations. Leaching of glass is simulated at 90°C and S/V=80 cm-1 in pure water or with iron from the canister and overpack or with argillite. The glass dissolution is described with an affinity law with respect to a nontronite-like phase, which saturation state depends on Si, Al, Fe, Na and Ca activities. The simulations results allow to reproduce both the decrease of the initial alteration rate and the so-called residual regime while the composition of the alteration layers are explained in terms of precipitated phases. In presence of metallic iron, the corrosion does not affect much glass dissolution rate if silica sorption is neglected. On the contrary, in presence of argillite, the alteration is enhanced by the dissolution of primary clay minerals and the precipitation of feldspar, K-zeolite and clay minerals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 86.1
Copyright
Copyright © Materials Research Society 2006

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