Exploring the Use of Fly Ash and Marble Coarse Aggregates as Eco-Friendly Replacements in Concrete Production

Abstract

This study investigates the feasibility of utilizing fly ash and marble coarse aggregates as sustainable substitutes in concrete production, responding to the increasing demand for infrastructure and the necessity to diminish the carbon footprint of construction materials. By partially substituting cement, a material that generates substantial greenhouse gas emissions, fly ash, a by-product of coal combustion, recognizes its capacity to reduce CO2 emissions. The stone processing industry produces marble waste, which, by repurposing otherwise wasted byproducts, offers an environmentally sustainable solution, simultaneously reducing the use of natural resources in the manufacture of traditional aggregates. The research aims to assess the effects of incorporating various ratios of fly ash, ranging from 10% to 50%, and marble coarse aggregates, ranging from 10% to 90%, on the workability, compressive strength, split tensile strength, and flexural strength. The results show a moderate decrease in a slump, with an 18.66% reduction at 50% marble coarse aggregates and 30% fly ash, and a significant increase in compressive strength, with a 60.22% improvement at 56 days with 40% fly ash and 70% marble coarse aggregates. Split tensile strength also improved by 35.50% to 36.66%. Non-destructive tests confirmed the structural integrity of the concrete. This study emphasizes the potential of fly ash and marble coarse aggregates as eco-friendly substitutes in concrete production.