Effect of Temperature on Strength Properties of Geopolymer Concrete

Generally ordinary Portland cement is using in concrete for construction. It results in the increase of cement demand. Production cement results in the emission of carbon dioxide (CO₂) in equal amount from the industries. About 7% of world emission CO₂ was produced from cement industries. Which shows serious effect on environment results in global warming and greenhouse effect etc. To overcome this issues replacing concrete with geopolymers which are rich in silica and alumina. Fly ash and GGBS based geopolymer concrete of different molarities (5M, 7M &9M) was casted. Sample cubes (150mmx150mmx150mm) of GPC were placed in oven immediately after demoulding for curing up to 20hrs duration. Cubes were cured at different temperatures (50^oC, 60^oC, 70^oC, 80^oC & 90^oC) for a constant period. After curing in oven cubes moved room for normal curing period. Workability test, NDT, compressive strength test were performed. Workability decreases with increase in molarity of alkaline solution. Different molarity GPC has different optimum strength and optimum temperatures. The slump cone test was carried to review the workability of concrete. After curing period of seven days and 28 days the UPV test, rebound hammer test and compressive test were performed. Concluded that different molarity GPC attains maximum strength at different temperature conditions. Test results show that the 5M & 7M GPC has optimum temperature of 70C, optimum temperature of 9M GPC is 60C.