PROPERTIES OF LIGHTWEIGHT AERATED GEOPOLYMER SYNTHESIS FROM HIGH-CALCIUM FLY ASH AND ALUMINIUM POWDER
Keywords:
Geopolymer, High Calcium fly ash, Aluminium powder, Lightweight aerated Geopolymer, CuringAbstract
In the present work, efforts to decrease unit weighs of the geopolymer mortar around 2,400
kilograms per cubic meter to be lightweight aerated geopolymer which density lower than 1,800 kilograms per
cubic meter and study the properties of lightweight aerated geopolymer based on binders composed of high
calcium fly ash, and the aluminum powder was studied. Compressive strengths and densities of lightweight
geopolymers with aluminium powder contents of 0-0.20%wt, NaOH concentrations of 7.5-12.5 molars, liquid
to fly ash ratios of 0.45-0.65, Na2SiO3 to NaOH ratios of 0.33-1.5, sand to fly ash ratio of 0.6-1.4, curing
temperatures of 25-100 degree Celsius, and curing period of 1-24 hours. were tested. In addition, SEM and
ultrasonic pulse velocity of lightweight aerated geopolymer were determined. Results showed that the
lightweight aerated geopolymer high calcium fly ash and aluminum powder with the 28-day compressive
strength of 1.2-12.6 MPa and densities of 770-1,560 kilogram per cubic meter, with satisfactory strength, could
be made.