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Journal of Porous Media
Fator do impacto: 1.49 FI de cinco anos: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v12.i3.30
pages 221-237

Experimental Investigations of Diffusive and Convective Transport of Inert Gas through Cement Pastes

F. Frizon
Atomic Energy Commission, DEN/VRH/DTCD/SPDE/L2ED, 30207 Bagnols-sur-Ceze Cedex, France
C. Galle
Atomic Energy Commission, DEN/DANS/DPC/SCCME/LECBA, 91191 Gif-sur-Yvette Cedex, France

RESUMO

In the context of the temporary near-surface storage of intermediate-level radioactive wastes, different concepts of waste packages are considered. Most of them are composed of an external container, made of fiber reinforced concrete, receiving several primary waste packages. Self-radiation of encapsulating matrices can lead to the continuous production of hydrogen, which, for obvious safety reasons, must be drained out of the container. Concrete, seen as an heterogeneous porous medium, can offer a path for gas transfer through its porosity. Then, the transport mechanism depends mainly on the production rate: the diffusion process takes place for a low production rate of hydrogen whereas permeation corresponds to a high production rate. This paper focuses on transport properties of the cement paste, which is the main porous component in concrete. The experimental investigation of gas diffusion and permeation through the cement paste porosity shows that the gas transfer ability of the material depends on two interdependent factors: the water saturation state and the microstructural properties of the material. In the context of cement-based materials, these two dimensioning parameters are mainly controlled by the formulation of the cement paste as well as the curing and operating conditions. The influence of these parameters on the diffusion and permeation properties of the cement pastes is experimentally evaluated.


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