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Immobilisation de déchets magnésiens dans un matériau alcali-active . Etude expérimentale et modélisation

Abstract : The operation of the first generation of nuclear reactors in France has generated magnesium and graphite wastes. Their conditioning in an alkali-activated slag mortar is being addressed. The durability of the package may be threatened by the temperature gradient resulting from hydration heat, the restriction of binder’s delayed strains and the metal’s corrosion. Evaluating the damage is then of great importance. Hence, a modelling approach based on an experimental campaign is being developed. The study considers, on one hand, the advancement of hydration reactions, the time evolution of the binder’s delayed strains and its mechanical properties, and on the other hand, the development of corrosion products around the metallic inclusions. The material undergoes significant autogenous shrinkage. However, its basic creep strains are shown to be important which could result in stress relaxation and avoids damage related to shrinkage restriction. Experimental data showed great accordance with time-equivalent ageing model. Mass loss and electrochemical measurements provided the metal’s corrosion velocity. MEB/EDS and Nano-indentation techniques identified the corrosion products microstructure and mechanical properties
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F. Rifai. Immobilisation de déchets magnésiens dans un matériau alcali-active . Etude expérimentale et modélisation. 35ème Rencontres Universitaires de Génie Civil: le génie civil face aux défis environnementaux, May 2017, Nantes, France. ⟨cea-02434006⟩

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