Abstract
The geopolymer appears as an ecologically viable alternative when compared to Portland cement, due to the lower CO2 emission rates. The objective of this work was to produce and characterize geopolymer pastes reinforced with long sisal fibers through toughness and modulus of elasticity responses. For this purpose, metakaolin was used as an aluminosilicate source material and a combination of sodium silicate and sodium hydroxide as the activator solution. The variables studied were the percentage of fibers in the composite, the ratio between the amount of activator and base material and the cure time. The statistical model of central composite planning was used in order to optimize the results obtained and scanning electron microscopy analysis was used to analyze the microstructure of the final composite. Modulus of elasticity values of 3.19 GPa were obtained with the use of 5.15%, by volume, of sisal fiber, an activator/metakaolin ratio of 0.41 with 24 days cure. The optimization of the toughness results occurred with the use of 5.19% of fiber by volume, a curing time of 7 days and a ratio between activator and binder of 0.55, reaching a result of 2.09 kJ/m2.
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