Per: Giovana zagalo de frança (universidade federal do pará), Paulo anderson ARANHA FERREIRA (UNIVERSIDADE FEDERAL DO PARÁ), RAYANNE OLIVEIRA LEÃO SANTANA (UNIVERSIDADE FEDERAL DO PARÁ), dIEGO JOSÉ DA SILVA SANTOS (UNIVERSIDADE FEDERAL DO PARÁ), ALISSON CLAY RIOS DA SILVA (UNIVERSIDADE FEDERAL DO PARÁ), VERÔNICA SCARPINI CANDIDO (UNIVERSIDADE FEDERAL DO PARÁ)
Abstract:
Geopolymers are cementitious materials that are synthesized from the geopolymerization of a source of aluminosilicates in an alkaline solution. Based on the formation of Si-O-Al bonds, they present properties of high mechanical performance, chemical inertness and durability, with the potential to replace Portland cement, as it is a green technology, with low emission of polluting gases. The present study aims to evaluate the compressive strength of geopolymeric pastes produced with metakaolin from the state of Paraíba, calcined at different temperatures (650°C, 750°C and 850°C for two hours). The geopolymeric pastes were produced using sodium silicate and sodium hydroxide as an alkaline solution, and as a precursor material, blast furnace slag was used as a source of calcium and metakaolin as a source of aluminosilicates. After the curing age of 7 days, mechanical and physical tests of compressive strength and water absorption were carried out, respectively. Finally, morphological analyzes of the paste fragments were carried out using an optical microscope. The results demonstrate that the mechanical resistance of the geopolymeric paste increases according to the increase in the calcination temperature, reaching its maximum peak of 37 MPa, and through optical microscopy analysis, a dense and homogeneous microstructure was observed, proving that metakaolin must reach its metastable phase for an efficient geopolymerization process to occur.
