Modelling The Alteration of Son-68 Glass with Nearfield Materials

Author:

de Combarieu G.,Barboux P.,Godon N.,Minet Y.,Gin S.

Abstract

ABSTRACTThe 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.

Publisher

Springer Science and Business Media LLC

Subject

General Engineering

Reference24 articles.

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Application of GRAAL model to the resumption of International Simple Glass alteration;npj Materials Degradation;2018-07-18

2. Structural and Modelling Studies;Waste Immobilization in Glass and Ceramic Based Hosts;2010-04-07

3. SON68 nuclear glass dissolution kinetics: Current state of knowledge and basis of the new GRAAL model;Journal of Nuclear Materials;2008-10

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