Reciclagem de resíduo gerado na extração de quartzito

• Ano de defesa: 2011
• Autor(a) principal: Mario Luis Cabello Russo
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Metalúrgica Materiais e de Minas; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUOS-8RRFAS

The consumption of aggregates in the civil construction has increased considerably lately in Brazil. The extraction of sand and gravel generates significant environmental impacts. As the quarries and sand deposits are getting exhausted near the big cities, the price of the aggregates is increasing. Meanwhile, the extraction of quartzite (dimensional stone) in the state of Minas Gerais has been done mostly in small quarries, with very low recovery. It generates approximately six million tons of waste by year, what brings pollution, increasing of final prices of products, decrease of the life time of the quarries, and the closing of enterprises. The government agencies and the quarries owners understand that only finding some application to this waste, will bring development and sustainability to the sector. The aim of this investigation is to study the application to the quartzite waste as aggregate in the civil construction. A literature review was done addressing extraction and waste generation in dimension stones quarries and the current technology in applications of this waste as raw materials in civil construction. Samples of quartzite wastes collected in a quarry were characterized by water absorption, size distribution, X-ray diffraction, and chemical and petrographic analyses. Laboratory tests of crushing and milling were done to analyze the technical and economic viability of reduce the size of coarse material to a finer one to be used as raw material in industrialized mortars and concrete pre-molded components. Samples of concrete using quartzite waste as aggregate were molded in proportions and water content used in production of premolded components to analyze the final compressive strength. Then, samples of mortars with quartzite waste as aggregate were molded with variations in proportion, water content and top size of aggregates to analyze the workability and final compressive strength. The coarser material was analyzed with tests of degradation, abrasion, loss by impact and particle shape. With the exception in the elongated fragments generates by breakage in the crusher, the results indicated the possibility of applying the material as aggregate in base or sub base for flexible pavements. There was no restriction in applying the quartzite waste as agregate in the production of industrialized mortars and pre-molded components