The soil in its natural state often swells and become expansive soils, also known as swelling soils, which are formed through the weathering of rocks containing clay minerals like montmorillonite. These soils exhibit significant volume changes when exposed to variations in moisture, leading to potential structural damage. Expansive soil after losing its moisture, shrinks posing risks to structures due to settlement. This settlement occurs due to variations in the California Bearing Ratio, low Unconfined Compressive Strength, and high compressibility of the soil. To assess and improve soil quality, tests such as consistency limits and the Standard Proctor Test for compaction are conducted. Stabilizing weak soil through reinforcement techniques mitigates structural risks. This is achieved by mixing the soil with multiple stabilizing agents in optimal proportions. The stabilizing agents used in the present study include Fly ash, Road Building International Grade 81, and silica gel. RBI Grade 81 has cementitious and fibrous properties, while Fly ash and silica gel are rich in siliceous content. These materials undergo pozzolanic reactions that fill gaps between soil particles, enhancing strength and reducing compressibility. Geotechnical tests show that mixing these stabilizers initially increases the soil’s maximum dry density and optimum moisture content, up to certain proportions. The optimal mix includes 10% Fly ash, 6% RBI Grade 81, and 5% silica gel. This combination significantly improves the properties of clayey soil, making it more stable and suitable for construction.