STUDY ON COMPRESSIVE STRENGTH OF GEOPOLYMER CONCRETE PASTE BY REPLACEMENT OF GGBFS %

This study focuses on how to arrive at the mix proportion of fly ash to alkaline activator ratio based on the void content of low calcium fly ash. Experimental Compressive strength result of Geopolymer paste for the Molarity M6, M8, M10, M12, M14, M16 for the GGBFS replacement of Fly ash at 25%, 30% and Alkali Activity ratio 1, 1.5, 2, 2.5, 3. The fly ash is replaced with Ground granulated blast furnace slag (GGBFS) at 25% and 30% for room temperature curing for the particle size of 90 microns in size of fly ash and GGBFS, tested at the end of seven days. From the detailed earlier study, the maximum compressive strength mix proportion is taken up in respect of the alkaline activator ratio. The GGBFS percentage is taken up and tested at the end of 7 days at room temperature, and the results are reported. The maximum compressive strength at the end of 7 days are 18.84 N/mm2, 19.44 N/mm2, 20.00 N/mm2, 20.32 N/mm2, 17.76 N/mm2 and 14.30 N/mm2 respectively.