STUDIES ON INFLUENCE OF FELDSPAR ACTIVATOR ON SLAG BASED GEO POLYMER CONCRETE

Substituting Ordinary Portland cement(OPC) with the alternative materials possessing binding properties can have significant assistance to the ecosystem and infrastructure. In the present study, Fly ash (FA) and Ground Granulated Blast Furnace Slag (GGBS) are the two binder materials used to replace OPC. Fly ash, a waste residue obtained by thermal combustion of coal. Secondarily Ground granulated blast furnace slag is the another binding material which is used in the study and is generally obtained from quenching process of molten iron slag. The work involves in evaluating the mechanical properties of the slag based geopolymer concrete; obtained by mixing Fly ash and GGBS in the ratio of 50:50 along with feldspar and NaOH as the alkali activators (NaOH: FS) with different ratios for initiating polymerisation reaction. Experimental study was carried out by varying NaOH: FS ratios to determine the optimum mix of the resulted geo polymer concrete. Finally, mechanical tests were carried out for the casted specimens and compared with the properties of ordinary Portland cement (OPC)