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Utilisation de matériaux naturels modèles pour la formulation de mortier contenant des sables et des fines de granulats recyclés

Abstract : Recycled concrete aggregates (RCA) are not enough used in the construction sector, mainly because of their high water absorption capacity. These fine particles are composed of crushed natural aggregate and adherent hardened cement paste. The first part of this work consists in valuing particles smaller than 4 mm of an RCA in a mortar composition. Thus, the fresh and hardened behavior of mortar performed with recycled fine aggregate and model natural aggregate have been compared. The natural model fine aggregate has been performed to have an equivalent physical characteristics with the recycled one. This approach helped to understand the hardened behavior of the mortar made with recycled fine aggregate. The second part of this work consists in finding a recovery track for particles smaller than 125 μm of RCA, the goal is to use them as mineral addition. A characterization work show that the recycled powder is porous, thus a theoretical model and an experimental methodology allowing to estimate this porosity are developed. Finally, a comparison between mortar made with a limestone powder, and a recycled powder are compared. The results show that the recycled powder can be used as mineral additive in mortar composition.
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Mohamed Elkarim Bouarroudj. Utilisation de matériaux naturels modèles pour la formulation de mortier contenant des sables et des fines de granulats recyclés. Génie civil. Ecole nationale supérieure Mines-Télécom Lille Douai; Université de Liège, 2019. Français. ⟨NNT : 2019MTLD0016⟩. ⟨tel-02497234⟩

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