Combination of Silica Fume and Fly Ash in Concrete with Sulfuric Acid-Curing

Abstract

Concrete needs as material in construction require innovation, one of which is in building materials. Innovation concrete is expected to have adequate strength quality, and good durability in certain environmental conditions. This study aims to determine the optimum content of the combination of silica fume and fly ash in acidic medium. In this study, the focus was on testing characteristics of concrete, such as compressive strength, split strength, and beam flexural strength. Silica fume used was constant with a value of 9%, and the variation in the content of fly ash was 0%, 9% and 11% of the weight of cement. The results of this study indicated that the variation of 9% SF + 11% FA was the optimum composition for the compressive strength with a different percentage between normal curing and sulfuric acid-curing of 3.31%. The variations of 9% SF + 9% FA was the optimum composition for the split strength and the beam flexural strength with a different percentage of 7.91% and 8.91%, respectively.