|type de publication
||communication internationale avec actes publiés
|date de publication
||M'Jahad Sofia; Davy Catherine A.; Skoczylas Frédéric; Bourbon Xavier; Brue Flore|
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||2th International Conference on Microstructural-related Durability of cementitious composites : Microdurability 2012
||de 11-04-2012 à 13-04-2012
||Amsterdam, Pays Bas
| nom des actes
||Proceeding of 2th International Conference on Microstructural-related Durability of cementitious composite (RILEM Publications)
| || |
|ISBN / ISSN
||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.
||Micro-cracking, concrete, gas breakthrough pressure, gas relative permeability, suction curve, partially-saturated concrete