Valorization of limestone quarry fillers in cementitious mixtures

This paper focuses on the incorporation of 0/80 mm limestone fillers in crushed sand for the production of ordinary concretes and thus studies their behavior in the fresh and hardened state. The use of limestone fillers in a cement medium will make it possible to assess their involvement in improving the mechanical properties of concretes in order to have sustainable eco-concretes. The study consists of studying the influence of the filler rate of 0, 6, 12, 18 and 24% on the rheological and mechanical properties of concretes made with crushed sands and gravels. Limestone fillers of the same nature as the aggregates improve the adhesion between paste and aggregate as well as the compressive strength. This study also aims to identify the maximum proportions that can be introduced without compromising the quality and durability of the concrete, by optimizing the granular mixture and to highlight possible beneficial effects. The principle is to compare different mortars by introducing by mass substitution to the sands additions of limestone fillers in different proportions. For each series made, characteristics on fresh and hardened mortar were measured.