The effect of sodium hydroxide molarity on setting time, workability, and compressive strength of fly ash-slag-based geopolymer mortar

Abstract This research investigates the influence of sodium hydroxide (SH) molarity on fly ash-slag-based geopolymer mortar’s workability, setting time, and compressive strength. The SH varies between 1M, 2M, 4M, 6M, 8M, 10M. mixture was proportioned to contain 30% slag as a substitution for ash, with alkaline activator binder (Al/Bi) ratio 0.45 silicate (SS/SH) 1.5. results showed that at range low (1M, 4M), time faster in containing higher molarities. In contrast, high (6M, 10M), is slower SH. Based concentration can be applied field Increasing will decrease workability but increase However, when increased after optimal established, strength reduced. maximum mortar 46.86 MPa, obtained an 6M.