Aplicação da escória de cobre batida como substituta do agregado em argamassas de assentamento e de contrapiso autonivelante

• Ano de defesa: 2017
• Autor(a) principal: Santos, Rafaela Lima dos
• Orientador(a): Sales, Angela Teresa Costa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Engenharia Civil
• Palavras-chave em Português: Argamassa; Escória de cobre; Granalha de cobre batida
• Palavras-chave em Inglês: Mortar; Copper slag; Blasted copper slag
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA CIVIL
• Link de acesso: https://ri.ufs.br/jspui/handle/riufs/17896

Environmental preservation is a widely discussed topic throughout society, due to heavy reliance on natural resources for survival on the planet. Rational use of raw materials and their proper disposal are on the agenda of the productive sectors’ major concerns. The present paper aims to evaluate the feasibility of application of copper production waste, called copper slag, after being used as abrasive material in blasting services, now called blasted copper slag. It was intended to replace conventional aggregate in laying block mortars for blasted slag, into two fractions, fine and thick. It was also studied the application of blasted copper slag as thin addition in mortars for self-leveling floor. Four laying block mortar mixtures were produced, for each type of blasted slag, "fine" and "thick", with levels of 25%, 50%, 75% and 100% of replacement, in addition to the reference mortar. For self-leveling mortar, 30% of the fine aggregate was replaced by the addition. The consistency of unhardened mortars was measured by flow table procedure and the range fixed in 270 ± 20 mm. Porosity tests in hardened mortars showed that water absorption remained close to the reference mixtures. The wicking tests indicated that this phenomenon was more intense for mixtures with higher levels of blasted copper slag, even more intense for mortars with "fine" blasted copper slag. Under mechanical tests by compression strength, the mortars with fine slag replacing the conventional aggregate, had significantly performance reductions both in relation to the reference mortar, as compared to the same mortar levels substitutions with thick blasted slag. Elastic modulus tests indicated that for mortars with thick blasted slag replacing conventional aggregate up to 75%, the variations were not so expressive. In fine blasted copper slag mortars, the modulus values decreased intensively, reaching a 75% reduction in stiffness compared to the reference. Under indirect tensile tension, there was not significant variation of this property in series with thick blasted slag. For mixtures with fine blasted copper slag, such strength reductions were significant, reaching about 90% of the value obtained by the reference mortar. The self-leveling underlayment mortar with inert addition of blasted copper slag showed a 24 cm spreading and a flow time of eight seconds, satisfying the required parameters. Results of the flexural strength tests showed that there was a reduction of 57% of resistance for the self-leveling mortar, compared to the reference. It can be concluded that, for small levels of replacement of conventional aggregate by thick blasted slag, there is feasibility of applying the mortar in laying masonry, whereas that, for this service, there are not required high levels of strength and stiffness. As for self-leveling underlayment mortar with inert addition of blasted copper slag, its application has also proved feasible, since a high resistance index is not required for this type of service