Utilização do resíduo gerado na exploração do itabirito em substituição ao agregado miúdo natural para preparação de argamassa de cimento Portland

TL;DRAbstract

The fine natural aggregates are a material largely used by the civil construction for mortar and concrete production. Due to tightening legal restrictions imposed on their extraction, alternative materials are being considered. The use of sandy residue from BIF (banded iron formations) exploitation as iron ore was investigated. It requires their grinding and flotation to concentrate iron oxides. Large amounts of sandy residue composed of quartz and iron oxides are generated in this process. The sandy residue was characterized relative to mineralogical composition, particle size distribution, presence of organic impurities, and particle shape. Mortar formulations were prepared by varying the type of cement, the cement to aggregate proportion and the water/cement ratio (a/c). The products were characterized by measuring the viscosity, density, setting time, compressive strength and water absorption. In addition, microstructural characterization was performed by XRD and SEM. The type of c

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