Avaliação da atividade pozolânica e do desempenho do resíduo de vidro moído como substituto parcial do cimento portland em concreto estrutural

Abstract

Civil construction is and always will be necessary for society and relevant for economic development. On the other hand, this sector is responsible for generating a lot of waste and for consuming non-renewable natural resources. Therefore, the concern with sustainability and the creation of goals to reduce environmental impacts is legitimate, and of utmost importance for civil construction. In this line, this work focuses on reducing the use of Portland cement (the main raw material of concrete), which is the most used material in this sector and to give a more sustainable destination for glass waste from the annual production of more than one million tons of glass containers. To this end, the objective was the production of structural concrete with partial replacement of cement in different percentages by dirty ground glass waste (impurities from the glass reverse logistics process up to the sorting stage). To verify the feasibility of this use for glass waste, the experimental procedure was divided into five stages: collection, preparation (crushing, grinding and sieving of the waste), evaluation of pozzolanic activity, molding of concrete specimens (reference mix, with 8% and 16% substitution), and finally, the control tests (compressive and tensile strength and water absorption by capillarity). The ground glass residue did not show pozzolanic activity, and did not result in improvements in the analyzed properties, however, in relation to compressive and tensile strength, the decreases are not significant. Thus, a study regarding the more detailed constitution of the residue and its impurities should be carried out for a better understanding of the results obtained. Keywords: Glass, pozzolanic activity, structural concrete.