Étude de l'influence de la nature des granulats sur les propriétés des bétons hydrauliques : cas des granulats calcaires tunisiens

Abstract : This study concerns the Tunisian granular resources, of limestone type, in the hydraulic mixtures. The used materials outcoming from the careers of Aïn Tebournouk, Nahli, Jbel Ressas, El Haoureb, Jradou and Tahent which have to feed the principal centers of consumption of the area of Tunis and the coastal zone of Center-East. The analyzed properties are the compressive and the tensile strengths and the elastic modulus. The recent models of the French LCPC were used to predict these properties. They do not always give satisfactory results, in particular if the mixtures are rich in fine elements, as it is often the case of the aggregates outcoming from careers. The mortars, micro-concretes and concretes carried out within the framework of this study made it possible to propose an extension of these models. For the compressive strength, the bond coefficient was associated with the content of fillers aggregates. The assumption is that the presence of these fine elements, of comparable nature that the aggregates, improves adherence paste and aggregate, thanks to bringing together the properties of rigidity of the two materials. For the tensile strength, a model describes by a hyperbolic law made it possible to provide a physical interpretation to the tensile strength behavior of the hydraulic mixtures. Its parameters are linked to the aggregate strength and cohesion in the paste-aggregate transition zone. Finally for the elastic modulus, the use of the model of the LCPC, which takes into account the properties of the granular phase and the binding phase, made it possible to reach the modulus of elasticity of some aggregates.
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Taoufik Achour. Étude de l'influence de la nature des granulats sur les propriétés des bétons hydrauliques : cas des granulats calcaires tunisiens. Autre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10105⟩. ⟨tel-01748324⟩

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