Experimental Investigation on the Sulphuric Acid Resistance Concrete Using Mineral Admixtures

Abstract

Concrete structures are basically subjected to acid and sulphate attacks in sewage and many other places. It shows a decrease in its strength because of chemical attack. Such attacks of acid and sulphate lead to the proliferation and fragmentation of concrete, and it will lead to damage to the concrete by the formation of hydration due to the reaction between Portland cement hydration material and acid of sulphate ions. The experimental investigation is based on mineral material in resistance to acid and sulfate attacks on concrete and to identify concrete mixtures that are more resistant to acid and sulphate attacks. The samples were prepared by 20, 30 & 40 percentage of replacement of cement with Class F fly ash (FA) respectively, and metakaolin (MK) concrete in which 5, 10, and 15 percentage of cement was replaced with metakaolin with cement and 8 and 15 percentage of cement was replaced with silica fume (SF) which were immersed in 20% of sulphuric acid and tested after 28, 90 and 180 days. To test the acid and sulfate resistance of a concrete samples, the appearance of the surface changes were observed and measured, compressive strength values, which showed that the resistant for sodium sulfate attack can be obtained using any of the two metakaolins or silica fume and using flyash as replacement produced maximum sulphate resistance from this study.