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Étude de la valorisation des laitiers de l'industrie sidérurgique et de production des alliages silico manganèse

Abstract : The steelmaking and manganese industries produce large amount of slag which are little upgraded today for the formulation of hydraulic binder in the field of civil engineering. The ground blast furnace slag (GGBFS) is integrated in the building materials industry but the converter steel slag (BOF slag) is mainly used as aggregates and the silicomanganese slag (LSiMn) is co granulated slag is now not upgraded in this sector. The companies ArcelorMittal, Eramet and Ecocem produces or exploit these slags, which are very different (origins and compositions), and want to develop the valorisation of these byproduct in the field of materials for building construction. Some studies have already shown that the steel slag and the silicomanganese slag can be integrated into cement matrix as component for cement industry. But few data exist about mechanism of hydration of these slags in cement systems, the sustainability of such systems and the environmental impact which involve the use of these slags. Our research concerns first the characterization of our slags, particularly the particle size distribution, the chemical composition and microstructure, and their reactivity. The results showed that the silicomanganese slag can be comparable with the ground granulated blast furnace slag because of their latent hydraulic behaviour but he has a different chemistry composition with lower calcium content and a little part of inert (10%). The steel slag, which has 23% of inert portion (compounds rich in iron) is very basic due to the presence of lime and portlandite and has a hydraulic behaviour. The formulation of binary systems cement (cement / slag) shown that the silicomanganese slag added to Portland cement forms, like blast furnace slag, hydrates (hydrated calcium silicates) which participate in the development of compressive strength. Then, the utilization of silicomanganese slag can be a good alternative for the formulation of hydraulic binders in the field of building materials. The steel slag has a little activity than other hydraulic slags cited and has a little participation for the development of the compressive strength. However, its high alkalinity makes it a good activator of latent hydraulic slags. Ternary cementitious systems (cement/steel slag/slag with latent hydraulic behaviour) have been prepared and show the ability of converter slag to activate the blast furnace and silicomanganese slags. These cementitious systems, composed of at least 80% of slags, have good mechanical properties for hydraulic road binders. In addition to these works, an environmental study was conducted for the slags and the cementitious matrix. The results show that the low leaching of pollutant allows the utilization of our slag as hydraulic road materials
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Clément Houze. Étude de la valorisation des laitiers de l'industrie sidérurgique et de production des alliages silico manganèse. Autre. Université Paris-Est, 2013. Français. ⟨NNT : 2013PEST1115⟩. ⟨tel-00957552⟩

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