This document presents a study on using egg shell powder and micro silica as partial replacements for cement in concrete. Concrete cubes were cast using 5%, 10%, and 15% replacements of cement with egg shell powder. Testing found that compressive strength initially increased up to 10% replacement but then decreased at 15% replacement. The scope of the study was to evaluate compressive, split tensile, and flexural strengths of the concrete mixtures at 7 and 28 days.