Soil stabilisation is mainly used for enhancing soil strength, durability, and load-bearing capacity by blending it with stabilizing agents to improve its engineering properties for construction and infrastructure projects. This process enhances the bearing capacity, shear strength, and durability of the soil. The current investigation focuses on optimizing the dosage of lime, cement, and bagasse content to be used for the stabilization of the subgrade. The study examined material combinations including bagasse at 8%, 10%, and 12%, lime at 1%, 3%, and 5%, and cement at 3%, 5%, and 7%. This research also seeks to explore the pozzolanic behaviour of the three-material combination in terms of heat of hydration at various curing stages. The hydrated products at different curing periods are also determined using SEM analysis. The tests conducted for the present study are California Bearing Ratio (CBR) and Unconfined Compressive Strength (UCS). Additionally, the investigation examines crack behaviour in the samples with different proportions using image analysis. The research determines the optimal percentages of lime, cement, and bagasse based on strength and hydration rate. The study concluded that a cement, lime, and bagasse ratio of 3:7:8 is found to be the most effective proportion.