Abstract: The current study looks at how lime content affects the fresh and hardened properties of Fly Ash and GGBFS-based geopolymer concrete cured at ambient temperature. Two series of geopolymer concrete (GPC) were developed, each with a constant binder content of 350 kg/m3 and an Alkaline-to-binder (a/b) ratio of 0.35. Fly Ash (FA) was sustained with GGBFS in the first series, with replacement amounts of 10%, 15%, 20%, 25%, and 30% by weight in each GPC series. Lime was not used in the initial concrete series assembly, but lime was added in the second series and lime combination created by replacing the GGBFS with lime at a constant 5 percent by weight. The best compressive strength produced geopolymer concrete from the first series, which comprises 70% fly ash and 30% GGBFS, was chosen as the lime substitute. Then a 5% weight substitution with GGBFS to lime is performed, for example, 70% FA, 25% GGBFS, and 5% lime. The slump test was used to evaluate the new qualities of the mixture. Furthermore, the mechanical performance of the lime-based geopolymer concrete was assessed using compressive strength, splitting tensile strength, and the Flexural strength test. Furthermore, statistical analysis was used to compare lime-based GPC to regular FA-based GPC and Ordinary cement concrete (OPC) in order to assess the significance of experimental characteristics such as lime levels. The experimental results showed that lime addition had a significant impact on both the fresh and hardened properties of GPC mixtures. Furthermore, the combination of GGBFS and lime significantly enhanced the mechanical properties of GPC, by close for the 7 days compressive strength but poor for the split tensile strength and flexural strength.

Keywords: Geopolymer Concrete (GPC), Fly Ash and GGBFS based Geopolymer Concrete, Lime Content in GPC

| DOI: 10.17148/IARJSET.2022.9476