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Effect of micro-cracking on water retention and gas transport properties of two industrial concretes

type de publication      communication internationale avec actes publiés
date de publication 2012
auteur(s) M'Jahad Sofia; Davy Catherine A.; Skoczylas Frédéric; Bourbon Xavier; Brue Flore
conférence 2th International Conference on Microstructural-related Durability of cementitious composites : Microdurability 2012
     dates de 11-04-2012 à 13-04-2012
     lieu Amsterdam, Pays Bas
     nom des actes Proceeding of 2th International Conference on Microstructural-related Durability of cementitious composite (RILEM Publications)
ISBN / ISSN 987-2-35158-129-2
résumé Damage in cement-based materials, usually marked by micro-cracking, affects notably the durability of civil engineering structures. In the context of deep underground storage structures for long life radioactive wastes, prior to the final closure of disposal tunnels, the concrete sheath may suffer micro-cracking. In this framework, the primary goal of the French Nuclear Waste Management Agency (Andra) is to get a good knowledge of the conditions, in which radioactive materials are efficiently isolated from the environment. Therefore, determining water retention and advective transfer properties of micro-cracked and partially water-saturated concrete is a critical issue. Several methodologies have been developed to create an “intermediate” and an “advanced” damage state, attributed to micro-cracks, in two different Andra industrial concretes. Gas permeability is used as the privileged tool to assess the actual damage state, because it has shown good sensitivity to micro-crack presence. Our aim is to investigate the gas migration properties (gas breakthrough pressure) and critical advective transfer properties (namely suction curves and gas permeability) of both concretes, before and after the dedicated damage procedures. Gas breakthrough pressures (GBP) are assessed by detecting gas presence on the downstream side of a confined sample, subjected to slowly increasing gas pressure on its upstream side.
mots clés Micro-cracking, concrete, gas breakthrough pressure, gas relative permeability, suction curve, partially-saturated concrete
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