UTILIZAÇÃO DE REJEITOS DE QUARTZITOS COMO AGREGADO PARA PRODUÇÃO DE BLOCOS DE CONCRETO PARA ALVENARIA ESTRUTURAL

Abstract

The necessity of this work is to study as properties of the quartzites used in the municipality of São Thomé das Letras, located in the south of Minas Gerais. Considering its extraction irregular or aggregate is considered an environmental liability, proven by the accumulation of tailings from its exploitation. After an analysis of studies that proved the feasibility of using quartz aggregate for concrete production, this study or waste utilization, minimizing environmental impacts and providing a minimum cost block in the market. Physical tests were performed with quartz aggregates according to the building standards and compared with literature results. It was adapted or ABCP / ACI dosing method for dry concrete production. Next, preliminary studies were performed on cylindrical concrete specimens, where they were compared as aggregate particle size according to ABNT NBR 7211: 2009 with aggregate particle size recommended by Fernandes (2015), making a comparison between the body producers. quartz and gneiss aggregate cylindrical specimens. The compressive strength using particle aggregate according to ABNT NBR 7211: 2009 was 1% higher than the use of quartz aggregate. Using a grain size recommended by Fernandes (2015), the cylindrical specimens had better finish and an increased proportion of 13.12%. Thus, Fernandes (2015) granulometry was adopted for the production of selected blocks, because the surface finish is more appropriate and the result of unreduced resistance. After this analysis, a production of selected blocks with quartz aggregate was developed, considering as comparative suggestions of traces used by Fernandes (2015) for the production of custom blocks. The compressive strength results of the selected blocks were satisfactory with the use of quartz aggregate, reaching values higher than the minimum established by ABNT NBR 6936: 2016. The final cost reduction using quartz aggregate for block production, compared to aggregates is 57.5%, making it a great economic and environmental alternative for the correct destination for quartzite tailings.