Numéro |
J. Phys. IV France
Volume 136, November 2006
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Page(s) | 25 - 38 | |
DOI | https://doi.org/10.1051/jp4:2006136004 | |
Publié en ligne | 22 décembre 2006 |
V. L'Hostis, F. Foct and D. Féron
J. Phys. IV France 136 (2006) 25-38
DOI: 10.1051/jp4:2006136004
Concrete long-term behaviour in the context of nuclear waste management: Experimental and modelling research strategy
C. Gallé, H. Peycelon, P. Le Bescop, S. Bejaoui, V. L'Hostis, B. Bary, P. Bouniol and C. RichetCEA Saclay, Direction de l'Énergie Nucléaire, DANS/DPC/SCCME, 91191 Gif-sur-Yvette Cedex, France
(Published online 22 December 2006)
Abstract
This paper draws the main lines of the scientific
strategy adopted by CEA for its R&D programme dedicated to the study of
the long-term behaviour of cement-based materials in relationship with
cemented nuclear waste management. In the framework of the safety assessment
analysis, the long-term stability of waste package confinement and
mechanical properties is required. This analysis was achieved considering
the different environmental conditions - atmospheric and water saturated
environments - which could affect the waste package. As far as the
unsaturated phase (storage) is concerned, corrosion and air carbonation of
reinforced concrete were identified as the two main phenomena which could
jeopardize the waste package long-term performances. During the disposal
phase, underground water leaching may significantly contribute to the
chemical degradation of concrete. The understanding and modelling of
phenomena and mechanisms responsible of such degradation are therefore
essential to make relevant and robust long-term predictions. With this aim,
CEA has developed an extended research programme to assess the long-term
degradation of concrete through a chemistry-transport and mechanical coupled
approach. The relevancy and validity of such a programme are discussed here.
© EDP Sciences 2006