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EFFECT OF MICRO-CRACKING ON WATER RETENTION AND GAS TRANSPORT PROPERTIES OF TWO INDUSTRIAL CONCRETES

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 microto macrocracking. 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, 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 gas migration properties (gas breakthrough pressure) and critical advective transfer properties (namely suction curves and gas permeability) for both concretes, before and after the dedicated damage procedures.