Properties of Hybrid Fibre Reinforced Geopolymer Concrete under Ambient Curing

The manufacture of Portland cement releases carbondioxide. The environmental problems caused by cement production can be reduced by finding a substitute conventional concrete material. An environmental friendly concrete is developed by replacing cement by flyash and GGBS and there by forming geopolymer concrete. Evolution of geopolymer concrete cured at ambient temperature broadens its suitability and applicability to concrete based structures. Different molarities of sodium hydroxide solution i. e.8M, 10M and 12M are taken to prepare different mixes and the compressive strength is calculated for each of the mix. From that optimum molarity was obtained and which is used for further studies. The steel fibres are added in this mix at varying percentages of 0, 0.25, 0.5, 0.75 and 1. After getting the optimum percentage of steel fibres, the polypropylene fibre are varied at 0, 10, 20, 30 and 40 percentages of steel fibre with optimum steel fibre remains constant. For curing, temperature was fixed at room temperature for 24 hours. The specimens are tested after the ages of 28 and 56 days. The test were conducted for cement, chemical admixture, and coarse aggregate & fine aggregate. The concrete specimens were tested for mechanical properties of concrete namely, cube compressive strength, splitting tensile strength, and flexural strength.