Acchar, WilsonMacêdo, Jeandson Willck Nogueira de2021-09-102021-09-102021-07-28MACÊDO, Jeandson Willck Nogueira de. Argamassa de revestimento produzida a partir da substituição do agregado natural por resíduo de scheelita e pó de pedra. 2021. 93f. Dissertação (Mestrado em Engenharia Civil) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2021.https://repositorio.ufrn.br/handle/123456789/33351The exploration of aggregates involves the extraction of non-renewable natural resources, and with that, it modifies the environment, causing environmental impacts. In 2016 alone, Brazil produced around 312 million tons of sand, an aggregate that is usually extracted from river beds, causing various damages to the environment, such as erosion, siltation of rivers, and soil contamination. To mitigate these impacts, several pieces of research have been developed with the objective of improving technologies that substitute natural aggregates for residues, such as those generated in gravel and scheelite mining. The state of Rio Grande do Norte concentrates the largest reserves of scheelite in Brazil, which are explored to obtaining tungsten, one of the most used minerals in the production of various industrial segments. During the extraction of this element, tons of solid waste are generated and stored outdoors, occupying large areas, providing impacts to the environment. Stone dust is the fine by-product originating from the rock crushing process to obtain gravel for civil construction, which, in turn, is usually deposited in the quarries yard, in large volumes, providing various environmental impacts and respiratory diseases. In Brazil, this by-product is used mainly in the production of concrete and industrialized mortar, however, its use in the production of mortar and concrete in construction works is still very limited. Faced with this problem, this research aims to study the performance of coating mortars produced with total replacement of natural aggregate by residual binary sands consisting of stone dust and scheelite by-products. For this, the characterization of waste and materials used in the manufacture of mortars was carried out, including FRX, DRX, and SEM analyses. Then, mortars were formulated at a ratio of 1:3 in volume, with total replacement of natural sand by residual scheelite sand and crushing. The mortars were analyzed for their properties in the fresh state (consistency, mass density, incorporated air content, and water retention) and hardened (tensile strength, compression strength, immersion absorption, capillary absorption, bulk density, and microstructure). In the end, coatings were performed, which in turn, were evaluated for adherence to traction. The study of the packing and granulometric distribution of the aggregates allowed the production of a high-quality residual sand from the combination, in equal parts, of the stone dust and the residue of the coarse scheelite. The mortar produced with this composition, in the fresh state, although denser, had better consistency, greater water retention, and incorporated air content similar to the reference mortar. In the hardened state, the formulation achieved high mechanical strength, higher mass density, lower absorption, both by immersion and capillarity, among all the evaluated mortars. Applied as a coating, it obtained tensile bond strength approximately to the reference mortar and, above the minimum values established by the Brazilian standards for coating mortars, which confirms the feasibility of using the composition of crushing sand and scheelite as an aggregate for mortars.Acesso AbertoArgamassaScheelitaAgregado residualAreia artificialAreia de britamasterThesis