Abstract
This study investigates the resistance of high-strength concrete (HSC) to sulfuric acid exposure, focusing on its application in constructing floors in acid storage plants, sewage manholes, and other areas exposed to acid. The aggressive chemical attack from acids poses a significant threat to concrete durability and strength. The study also examines the effect of supplementary cementitious materials (SCMs) on enhancing the resistance of HSC to acid attack. Six HSC mixtures were evaluated: two control mixes, two mixes contained 25% cement replacement, one using fly ash Type-F and others using slag. Three mixes have been cured in water for 3 days, while others have been cured in water for 28 days. All mixtures were immersed in a 3% sulfuric acid solution for a period of 28 or 56 days. To assess concrete deterioration, compressive strength, tensile strength, and weight loss were measured. The study demonstrated that exposure to sulfuric acid caused significant surface erosion on HSC. All HSC mixtures experienced strength loss, especially the control mix. The presence of slag enhanced the acid resistance of HSC, particularly for the 3-day cured specimens. While the presence of fly ash enhanced the acid resistance of HSC for the 28-day cured specimens
