Abstract
The current research work focuses on evaluation of workability, compressive strength and microstructure of geopolymer concrete (GPc) made with fly ash (FA) and ground granulated blast furnace slag (GGBFS) and that made with fly ash and OPC. The FA-GGBFS, and FA-OPC based GPc were made by replacing FA with GGBFS and OPC, respectively, at 10% and 20% by the mass of total binder. For the preparation of GPc mixes, sodium silicate (SS) solution and sodium hydroxide (SH) solution were used with a mass ratio of 1.2, and NaOH solution was prepared at 6 M and 8 M concentrations. In this study, tests for workability, compressive strength at 7 days and X-ray diffraction (XRD) analysis were conducted on geopolymer composites. The results showed reduction in slump value with increase in the concentration of SH solution and with GGBFS and OPC content in the GPc mixes. Further, the FA-OPC based GPc showed lower slump value than FA-GGBFS geopolymer composites. The FA-OPC geopolymer composites mostly showed lower strength as compared to FA-GGBFS based GPc. From XRD analysis, anorthoclase and albite peak intensities were higher in the geopolymer composites made with FA-GGBFS than GPc with FA-OPC.
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