The world's most popular building material, concrete's production has skyrocketed in tandem with the rapid construction of infrastructure. In the construction industry to make more money while reducing waste. Alternative products that can cut construction costs are being sought by the construction industries. The effect and experimental results of replacing eggshell powder in cement are discussed in the paper.In Portland pozzolona cement, eggshell powder of 10%, 15%, and 20% was added to the concrete for the compressive test 1 .The outcomes demonstrate that eggshell powder can be utilized in place of cement. The hydration products of the pastes were altered as a result of the reaction between the C3A and the eggshell CaCO3.Eggshell powder accelerated cement hydration and provided nucleation sites in the hydration products.