Abstract
The aim of the present research work is to evaluate the effect of sand-to-binder (S/B) ratio and fly ash/GGBS blends on durability performance, and microstructural evolution of fly ash/GGBS based geopolymer mortar (GPM) against various acidic environment especially for exposure to HCl and H2SO4 solutions. The effect of sand-to-binder (S/B) ratio and fly ash/GGBS blends on flowability, strength, water absorption, permeable voids, acid resistance, and microstructural changes of geopolymer mortar (GPM) are investigated. The deterioration factor of GPM specimens exposed to different acidic environment are determined for different values of sand-to-binder (S/B) ratio and fly ash/GGBS blends. Test results indicated that the GPM specimens after exposure to acidic environment showed higher deterioration factor when compared with the strength measured at 28 days and 180 days of ambient curing. GPM made from fly ash/GGBS blend of FA55/G45 exhibited higher compressive strength up to 180 days and poor resistance against H2SO4 and HCl solutions whereas GPM made from fly ash/GGBS blend of FA85/G15 showed better resistance against acid solutions due to lower deterioration of aluminosilicate gels. GPM prepared from S/B ratio of 2.5 showed higher permeable voids, maximum weight loss, and comparatively lower strength loss against acid solutions.
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