Studies on Fly-Ash Aluminum Composite Produced Sitender1, Mahender2 1Assistant Professor, Department of Civil Engineering, GITAM, Kablana, Jhajjar, India 2M. Tech Scholar, Department of Civil Engineering, GITAM, Kablana, Jhajjar, India Online published on 31 October, 2017. Abstract This research studies the utilization of alumina waste and silica waste for geopolymer production. The study makes the reuse of aluminum hydroxide waste (Al-waste) for geopolymers. For cement materials, both Al-waste and fly ash (FA) were mixed at different water, sand, fly ash contents of 10–60 weight%. The mass ratio of sodium silicate (Na2SiO3) to sodium hydroxide (NaOH) solution was fixed at 2.5. Here, the NaOH concentrations of 5, 10, and 15 M were used as alkaline activators for geopolymerisation. The composite has been cured at room temperature for a week and also in an oven at 60°C and 80°C for 24 h, the geopolymerisation was increased with increasing concentration of NaOH. The mechanical properties, microstructure, bonding, and phases of the resultant geopolymers has been analyzed after curing. In geopolymer production, the mortar was cast in 50x50x50 mm cubic shape for both methods with cured temperature at 60 degree Celsius. Compressive strength has been tested at 1, 7, 14 and 28 days. The results has revealed that the best SiO2: Al2O3 ratio must be 3.5: 1 mixed by alumina waste 48.3 g. and silica waste 22.89 g. with 10 ml of sodium hydroxide and 20 ml of sodium silicate. This proportion gains the highest compressive strength for 265.8 kg/cm2 at 28 days of curing. The study concluded that the production of geopolymer mortar from alumina waste and silica waste cannot be considered as hazardous waste. Top Keywords Geopolymers, Geopolymerisation, Silica, alumina waste, NaOH. Top |