The document investigates using secondary lime and rubber tire powder to stabilize clay soil. Standard Proctor and unconfined compression tests were performed on clay soil mixed with various percentages of secondary lime (5-25%) and rubber tire powder (3-15%), with 20% secondary lime. Test results showed maximum dry density of 1.20 g/cm3 and unconfined compressive strength of 3.758 kg/cm2 at 20% secondary lime. Further tests with soil + 20% lime and varying rubber powder showed maximum dry density of 1.92 g/cm3 and strength of 4.417 kg/cm2 at 12% rubber powder. The study concluded that a combination of 20% secondary lime and 12%