Muse, Nasrudin MahamoudOlgun, Murat2024-10-032024-10-032022978-605-72134-1-9https://hdl.handle.net/20.500.13091/6330Geopolymers are inorganic polymeric compounds created by synthesizing raw materials rich in silicate and alumina. A complex aluminosilicate gel develops when these raw ingredients are incorporated with an alkaline solution during the polymerization process. However, there are many factors affecting the geopolymerization process. In this research, factors affecting the mechanical properties of fly ash-based geopolymer mortars in the presence of silica fume were investigated. These factors are the binder/aggregate ratio, the presence of silica fume in the binder materials, different molarity of sodium hydroxide, and different ratios of sodium silicate to sodium hydroxide. It has been observed that increasing both binder (Fly ash + Silica Fume) to aggregate ratio (10%, 15%, 20% and 25%) and molarity of NaOH (6M, 8M, and 10M) has resulted in a continuous increase in compressive and flexural strength of geopolymer samples. Increasing the ratio of Silica Fume (10%, 20%, 30%, and 40%) to total binder dosage in the mixture up to 20% has caused an increase of compressive and flexural strength geopolymers. After that, the strength obtained decreased with a further increase of silica fume dosage beyond 20%. On the other hand, increasing the Na2SiO3 to NaOH ratio resulted in a decrease in the compressive and flexural strength of fly ash-based geopolymer mortars. This could be related to the presence of excess silicates in the geopolymer mixture, which could obstruct the geopolymeric structure formation and decrease the strength of geopolymer mortars.eninfo:eu-repo/semantics/closedAccessGeopolymerFly AshSilica FumeSodium HydroxideSodium SilicateConference Object