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Influence des sables fillérisés calcaires sur les propriétés des bétons courants et superplastifiés. Un exemple tunisien

Abstract : The objective of this work is to study the effect of the quantity of fillers on the rheological, mechanical and dimensional properties of calcareous concretes. These concretes were made with the same coarse aggregates and same sand coming from the same production, in order to avoid any artifact. Sand was used to manufacture five sands representative of the categories defined in the EN 12260 norm for aggregates for concretes, by mixture with its fine fraction or its grained fraction extracted beforehand by washing. The employed sands contain approximately 0, 6, 12, 18 and 24 % of fillers. The concretes were formulated with the BetonlabPro2 software, whose algorithms take into account the presence of the fillers limestones. Concretes were realized at first without superplastifiant, then in the presence of a superplastifiant measured in 2/3 of saturation. The obtained results showed that a quantity of fillers limestones from 100 to 130 kg/m3 for the concretes and from 60 to 80 kg / m3 for superplasticizred concretes allows obtaining optimal properties, in equal consistency. But, higher quantities of fillers do not deteriorate significantly the properties of the concretes, even if their packing density decreases. One explains this behavior not only by the binding effect allotted to the fillers limestones, but also by an improvement of the paste-aggregates bond. Mixtures containing the strongest rates of fillers were again studied to formulate self compacting concretes SCC, which require a big quantity of fillers. Crushed sands bring then the major part of this constituent, what opens to them a new way of use
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Imène Joudi-Bahri. Influence des sables fillérisés calcaires sur les propriétés des bétons courants et superplastifiés. Un exemple tunisien. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0156⟩. ⟨tel-01749376⟩

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