Análise do uso de resíduo de vidro em geopolímero à base de metacaulim

Abstract

The environmental agenda has been becoming more and more popular for some time. Its popularity stems precisely from the urgency of its discussion, essential in times of accelerated and disorderly population growth, which brings with it greater environmental impacts. Concomitantly with population growth comes urban expansion, there is a need for expansions, adaptations, construction of houses and buildings and with that the use of greater amounts of construction materials, such as cement. Portland cement consumption in the world has taken huge and growing proportions annually, and along with that, the environmental impacts linked to it, from its extraction to its production, responsible for about 8% of all carbon dioxide emissions in the world. Due to such impact, it is necessary to seek alternatives that are less harmful to the environment and it is in this context that geopolymers arise, replacing cement in some of its applications in civil construction, making it possible in its development to use industrial waste and by-products. This work aims to synthesize a geopolymeric mixture of metakaolin and flat glass waste, using sodium hydroxide and sodium silicate as activating solutions. Through the analysis of compression tests, it was possible to evaluate the effect of the variables activator/precursors rate, test age and metakaolin replacement content by glass residue, in order to analyze the technical feasibility of such a cement mixture as an alternative to cement. Portland in construction. The results obtained showed an inverse correlation between the variables of partial replacement of metakaolin by glass and the rate of activators and precursors, with the geopolymer composed only of metakaolin which presented the best mechanical results. However, the analysis of the addition of glass residue was satisfactory up to 12,5% in substitution of metakaolin, without major losses in the mechanical performance of the composite. An optimal ratio of activators/precursors close to 0.59 was also found. The results obtained were preliminary, highlighting that further studies with the refinement of the fineness of the waste of float glass used can result in composites with better mechanical properties.