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29. Chloride transport within the bulk of hardened cementitious materials



Title: 29. Chloride transport within the bulk of hardened cementitious materials
Author(s): M. Castellote, C. Andrade, P. Zuloaga, M. Ordonez
Paper category : conference
Book title: NUCPERF 2009 - Long Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants and Waste Management
Editor(s): V. L'Hostis, R. Gens, C. Gallé
Print-ISBN: 978-2-35158-072-1
e-ISBN: 978-2-35158-087-5
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 265 - 272
Total Pages: 8
Nb references: 14
Language: English


Abstract: Reinforced concrete is the most used material in engineered barriers in low-level nuclear waste disposal facilities, as is the case of El Cabril repository, in Spain, that has a design life objective longer than 300 years. One of the most aggressive agents for the rebars in concrete is the chloride ion that, in the case of these structures, do not come from outside, but they are inside the drums as part of wastes, and in the filling mortar of the containers, as the chloride containing liquid wastes are mixed with the cement while casting it. Therefore, there is a chloride transport within the bulk of these hardened materials, from mortar to concrete, whose rate has to be determined in order to be able to model the service life of the structure. In this work, combined specimens of chloride contaminated mortar (3 concentrations, 2 chloride salts) with chloride free concrete have been cast, trying to simulate the case of the real structures in El Cabril. After 21 months the distribution of chlorides in both materials have been analysed, determining the diffusion coefficients, that resulted to be about one order magnitude smaller than that determined by an equivalent method using a solution as chloride source.


Online publication: 2009-11-16
Publication type : full_text
Public price (Euros): 0.00