Investigação de potencialidade pozolânica do resíduo de beneficiamento de rochas ornamentais após tratamento térmico para produção de pasta cimentícia

• Ano de defesa: 2015
• Autor(a) principal: Vazzoler, Janaína dos Santos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Civil; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Civil
• Palavras-chave em Português: Industrial wastes; Ornamental stone wastee; Pozzolan; Pozzolanic activity; X-ray difraction; Scanning electron microscope; Cement paste; Portland cement; Atividade pozolânica; Resíduo; Resíduo do beneficiamento de rochas ornamentais; Pozolanas; Difração de raios X; Microscópio eletrônico de varredura; Pasta cimentícia; Cimento Portland; Rochas ornamentais; Resíduos industriais; Cimento portland; Microscópio eletrônico; Raios X - Difração; Engenharia Civil; 624
• Link de acesso: http://repositorio.ufes.br/handle/10/9467

This work investigates the potential use of ornamental stone waste after thermal treatment as pozzolanic admixture in cement pastes. The ornamental stone waste was ground and sieved after thermal treatment at 1.200 ºC, being henceforth named OSWTT. The OSWTT was evaluated according to parameters specified by NBR 12.653 (ABNT, 2014) and used, in different dosages, for the production of cement pastes. The OSWTT was analysed in the following manner: chemical composition, by X-ray fluorescence; mineralogy, by X-ray diffraction; microstructure, by scanning electron microscope with attached energy dispersive X-ray; specific surface, using the method of Blaine; fineness, with 75 m and 45 m sieves; and pozzolanicity, by calculating the pozzolanic activity index in mixtures with hydrated lime and in mixtures with Portland cement, by the method of Fratini and by the method of Luxán. The microstructure of the cement pastes was analysed using images captured by the scanning electron microscope. The results indicate that the OSWTT possesses pozzolanical capacity when utilized in the production of cement pastes, being capable of generating in the final product a denser microstructure because of the pozzolanic reactions and of the filler effect. The OSWTT was used in 5% and 10% as additive and the best performance was obtained with the addition of 5% with respect to the mass of Portland cement of OSWTT in cement pastes.