Effect of different supplementary cementitious materials on compressive strength of concrete with varying size of aggregates

Abstract

In this rapid urbanization age, cement concrete is one of the most popular and demanding building materials. One of the components of concrete is roughly 12–15% cement. Overall, yearly cement manufacturing contributes around 7% of the world's CO2 emissions. As a result, the concrete industry is a global warming contributor. The goal of this research is to discover a method for mitigating the environmental risks that its production causes. Materials such as Fly Ash (FA), Rice Husk Ash (RHA), Silica Fume (SF), and Ground Granulated Blast Furnace Slag (GGBFS) are examples of supplementary cementitious materials (SCMs). If utilized as a substitute for cement in concrete, these components have the advantage of enhancing the strength of the concrete over time. This study shows the comparative effect of three SCMs i.e. FA, RHA and SF on compressive strength of concrete proportionated by Nominal Mix (NM) and Design Mix (DM) techniques both. In addition to that different ranges of aggregates 20 mm−12.5 mm, 9.55 mm−4.75 mm were also used to improve the packing density of concrete. During A total of sixty-six 15cmx15cmx15cm cubes were created for the experimental inquiry to measure the strength of cubes for varied curing durations of 14, 28, and 56 days. FA and RHA were utilized individually for partial cement replacement with proportions of 15%, 20%, 25 percent%, 30%, and SF with 10%, 15%, 20%, and the compressive strengths of 14 days, 28 days, and 56 days were computed using the compressive testing machine.