Estudo da incorporação de resíduo de Scheelita para produção de argamassa autonivelante.

Abstract

The present work aims to analyze the influence of the incorporation of the fine by-product of the processing of scheelite partially substituted to the natural aggregate in the composition of self-leveling mortars. To carry out the study, initially, the physical characterization of the materials was carried out, through granulometry, specific and unitary mass. Then, previous tests were carried out to study dosages, through the mini slump, to determine the trait and superplasticizer additive content, defined from the literature review. The mortars were formulated in a proportion of 1:2, by mass, using residue replacement levels in the proportions of 0%, 40%, 50% and 60%. The analysis of the mortars was carried out regarding their properties in the fresh state (mini slump) in order to obtain the result of optimal mortar dosage and, later, analyzed regarding their properties in the hardened state (compressive strength, tensile strength in bending , bulk density, water absorption by immersion and capillarity) at 7, 14 and 28 days of age. Analyzing the results obtained, it was observed that the incorporation of the residue gave the mortars a better packing of the grains, which provided improvements in the properties of the studied mortars. In the fresh state, through the mini slump test, it was possible to reach the optimal dosage. Evidencing that, the mortars produced with residues, obtained greater fluidity and better performance, if compared to the reference formulation. Regarding the hardened state, the mortars with tailings obtained higher mechanical strength both in compression and in flexural traction, higher mass density, lower water absorption, both by immersion and capillarity. However, it can be considered that the mortar that presented the best performance was the AAN with 50% of the residue, if compared to the reference mortar. Therefore, it is concluded that the fine residue from the processing of scheelite has high potential for insertion of natural fine aggregate replacement.