Per: paulo anderson aranha ferreira (universidade federal do pará), giovana zagalo de frança (UNIVERSIDADE FEDERAL DO PARÁ), rayanne oliveira leão santana (UNIVERSIDADE FEDERAL DO PARÁ), emily de fátima pinheiro botelho (UNIVERSIDADE FEDERAL DO PARÁ), VERÔNICA SCARPINI CANDIDO (UNIVERSIDADE FEDERAL DO PARÁ), ALISSON CLAY RIOS DA SILVA (UNIVERSIDADE FEDERAL DO PARÁ)
Abstract:
The growing demand for sustainable construction materials impacts the production of new binders that have low CO2 emissions. A new class of alternative cements called geopolymers can be produced using waste from the mining and agricultural industries. Geopolymers are produced from a material rich in aluminosilicates and an alkaline solution. The Si-O-Al bonds present in geopolymers give them high mechanical strength, durability and refractoriness. Based on this, the present work evaluated the influence of thermal curing on the compressive strength of geopolymer mortars with the addition of blast furnace slag, and also their morphology after rupture. For this, metakaolin obtained at 850°C for 2h, 35% blast furnace slag, sodium hydroxide, sodium silicate and commercial sand were used for the production of geopolymeric mortar. After molding, the specimens were subjected to 25°C, 60°C and 120°C for 20h. After 7 days of curing at room temperature, the specimens were subjected to a compressive strength test, and then the fracture morphology was analyzed via optical microscopy (OM). The geopolymer mortar thermally cured at 60°C showed better compressive strength, with 59.78 MPa, with a dense and compacted microstructure.