Transport model for the nuclear decontamination of cementitious materials

This paper describes a transport model for the nuclear decontamination of cementitious materials by electromigration. The porous medium is assumed to be saturated and reactive with the radioelement of interest, cesium. The transport of ions is described by a Nernst–Planck equation, in the framework...

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Bibliographic Details
Published in:Computational materials science 2003-06, Vol.27 (4), p.507-516
Main Authors: Frizon, F, Lorente, S, Ollivier, J.P, Thouvenot, P
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Cement concrete constituents
Cementitious material
Cements
Concretes. Mortars. Grouts
Decontamination
Exact sciences and technology
General (composition, classification, performance, standards, patents, etc.)
Materials
Radioelement
Safety, energy, plant environment
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Summary:This paper describes a transport model for the nuclear decontamination of cementitious materials by electromigration. The porous medium is assumed to be saturated and reactive with the radioelement of interest, cesium. The transport of ions is described by a Nernst–Planck equation, in the framework of a multi-species approach to the problem. The overall electrical field accounts for the electrical field applied externally, and for the membrane potential. Two extreme cases are detailed: irreversible cesium binding, and reversible cesium sorption. It is shown that cesium interactions with the solid phase have a strong effect on the decontamination rate. In addition, the influence of the initial cesium content in the pore solution and the relevance of accounting for the membrane potential in the transport equations, are discussed.
ISSN:0927-0256
1879-0801
DOI:10.1016/S0927-0256(03)00051-X