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Author(s): B. Larbi, W. Dridi, P. Le Bescop, P. Dangla, L. Petit
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 510-522
Total Pages: 961
Language : English

Abstract: Ions and radionuclide diffusivity in concrete is one of the most important factors that determine service life and safety assessment of cement based structures in nuclear power plants and radioactive-waste repositories. Apart from the influence of cement paste microstructure, the presence of aggregates may have an impact on transport properties of the material. The well known interfacial transition zone, denoted by ITZ, is created near the aggregates and characterized by a greater porosity. The goal of this study is to investigate the competition between the more diffusing ITZ zone and the less diffusing aggregates. To this end, several series of tritiated water diffusion tests are conducted on mortars characterized by different water-to-cement ratios and sand volume fractions. In parallel, microstructure of these materials is explored by mercury and water porosimetry and by SEM observation. It is shown that the content of aggregates influences the diffusivity in mortar, and alters the microstructure of cementitious matrix. The obtained values of tritiated water diffusivity are described with respect to microstructural properties of the materials. The results will provide more reliable data for service life and safety assessment models.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00

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