This article investigated the potential of fly ash (FA)/blast furnace slag- (BFS-) based geopolymer as a novel backfilling material. The effects of NaOH concentration and FA/BFS mass ratio were explored through XRD. FTIR. and TG-DTG analyses. https://www.alarecre.com/NHL-Vegas-Golden-Knights-Black-Background-iPhone-14-Plus-Skin-p42149/