Acid Attack on Fly Ash and GGBS Blended Geopolymer Concrete using Different Fine Aggregates

This investigation is mainly focused on the acid attack on class F fly ash (FA) and ground granulated blast furnace slag (GGBS) blended geopolymer concrete (GPC) using different fine aggregates. The GPC mixes (FA50-GGBS50) were manufactured with different fine aggregates viz. slag (SLAG), quarry dust (QD) and bottom ash (BA) at replacement levels of (SAND50-SLAG50, SAND50-QD50, SAND50-BA50) using sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions as alkaline activator. The compressive strength, weight and ultrasonic pulse velocity (UPV) values of GPC mixes were determined after 28 days of immersion in 3 % sulphuric acid (H2SO4) after 28 days of ambient room temperature curing. The slag and quarry dust replaced GPC mixes performed better than bottom ash replaced mixes at ambient room temperature curing at all ages.