Concrete in engineered barriers for radioactive waste disposal facilities – Phenomenological study and assessment of long term performance

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Abstract

The paper aims to highlight recent developments at the Belgian Nuclear Research Centre SCK•CEN in experimental and numerical study of the coupled physical-chemical behaviour of concrete subject to chemical degradation. The discussion mainly focusses on three interlinked research projects covering novel experimental methods to study the alteration of hydraulic and transport properties during carbonation and calcium leaching, a pore scale numerical model to capture microstructural changes due to the above degradation processes and a generic multiscale model aimed at determining evolution of the properties of a macrostructure over the long term. The paper also describes supplementary continuum scale numerical studies concerning concrete-clay interactions and geochemical impact on the physical structure of concrete. Preliminary findings from these studies show encouraging results such as the development of novel leaching, water permeability and diffusion apparatus, a robust pore scale model based on Lattice-Boltzmann method and a mesoscale study focused on the importance of interfacial transition zones on the effective diffusivity for linear and nonlinear diffusion problems.

Details

Original languageEnglish
Title of host publicationProceedings of the ASME 2013 15th International Conference on Environmental Remediation and Radioactive Waste Management. ICEM2013 (on CD)
Place of PublicationUnited States
Pages1-10
StatePublished - Sep 2013
EventICEM 2013 - 15th International Conference On Environmental Remediation And Radioactive Waste Management - Brussels, Belgium

Conference

ConferenceICEM 2013 - 15th International Conference On Environmental Remediation And Radioactive Waste Management
CountryBelgium
CityBrussels
Period2013-09-082013-09-12

Keywords

  • chemical degradation, concrete, engineered barriers, radioactive waste disposal facilities

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