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), MIRIANE ALEXANDRINO PINHEIRO (UNIVERSIDADE FEDERAL DO PARÁ), VERÔnica scarpini candido (UNIVERSIDADE FEDERAL DO PARÁ), ALISSON CLAY RIOS DA SILVA (UNIVERSIDADE FEDERAL DO PARÁ)
Abstract:
Portland cement concrete is the second most consumed material on planet Earth, due to its use in buildings, paving and structures. However, the combined production process for its production generates a significant amount of CO2, which worsens the greenhouse effect. Therefore, engineers and materials scientists are researching alternative cements that have green technology in their processing and high performance. Geopolymers are inorganic cementitious materials formed from a source of aluminosilicates and an alkaline solution. Which, based on Si-O-Al bonds, present high mechanical resistance, durability and retractability. And they can be produced with low energy cost waste and clay materials. The present work aimed to evaluate the influence of the length of short residual polyester fibers on the compressive strength of geopolymers based on metakaolin with the addition of blast furnace slag. For this, metakaolin obtained at 850°C for 2h, 35% blast furnace slag, sodium hydroxide, sodium silicate and residual polyester fibers (PLE) from the tire industry were used. A priori, the specimens for the compression resistance test were molded, with a fixed addition of 0.5% PLE fiber, varying three lengths, 5, 10 and 15 mm. After 7 days of curing, the specimens were subjected to the compression resistance test, and their physical properties of water absorption and specific mass were determined. In addition, optical microscopy (OM) of each post-test variation was performed. Geopolymer cement with 5mm fiber showed greater compressive strength, with 42.45 MPa, with physical properties similar to those found in the literature. Furthermore, it was noted, through optical microscopy, that as the length of the fiber is increased, there is greater anchoring in the geopolymeric matrix.
