Evaluation of acid resistance in concrete Admixed with silica fume and M-sand

Abstract

The M40 grade conventional concrete is made and its response towards acid resistance is compared with concrete partially modified with mineral admixtures and manufactured sand. 5% by weight of binder is replaced with silica fume. Fine aggregate is replaced partially with range of 0%, 15%, 25%, 35% and 45% by manufactured sand. All the mixes are cured under water for 28 days and also cured in two acidic mediums. Acid attack on concrete is studied for HCl and H₂SO₄ solution with concentration of 1%. All the mixes are observed for its loss in weight and compressive strength after acid attack. The mix with 45% manufactured sand and 5% silica fume showed better performance. There was reduction in loss of weight when manufactured sand is replaced for 45%. Addition of silica fume enhances pozzolanic action at early age and hence early strength of concrete. Modified Concrete resists HCl than H₂SO₄ solution.