Eggshell Waste to Wonder: A Novel Approach to Sustainable Cementitious Materials

Abstract: Eggshells, a widely available byproduct of food consumption, are generated in vast quantities globally, with significant waste accumulation in domestic and industrial settings. Despite their high calcium carbonate content, eggshells are often discarded, leading to environmental concerns such as landfill congestion and methane emissions. This study explores the potential of repurposing powdered eggshells as a partial replacement for cement in concrete production, addressing both waste management challenges and the sustainability of cement manufacturing. In this experimental investigation, cement was replaced by eggshell powder in varying proportions of 2.5%, 5%, 7.5%, and 10%. Concrete mixes were prepared, and the resulting properties, including mechanical strength and durability, were evaluated. The results showed that the mix with 10% eggshell powder replacement exhibited the best performance, demonstrating optimal mechanical strength and durability. This study underscores the feasibility of utilizing eggshells as a sustainable alternative material in concrete, contributing to circular economy practices. By reducing reliance on mined limestone and decreasing carbon emissions associated with traditional cement production, the use of eggshells offers an eco-friendly solution to both waste management and industrial sustainability. The findings support the growing recognition of eggshells as a recyclable resource in various industries, including construction, and highlight their potential to reduce waste accumulation while promoting sustainable development.