This paper investigates the effects of tile waste on the geotechnical properties of expansive soil, including liquid limit, plastic limit, compaction characteristics, California Bearing Ratio (CBR), and swelling pressure. The study uses locally collected expansive soil mixed with tile waste from 0 to 30% in increments of 10%. The results show that the liquid limit, plastic limit, optimum moisture content, and swelling pressure decrease with increasing tile waste, while the maximum dry density and CBR increase. Specifically, the maximum dry density reaches its peak at 20% tile waste, and the CBR increases by 105% compared to untreated soil. The study concludes that up to 20% tile waste can be effectively used to strengthen expansive soil subgrades in flexible pavement construction, offering significant cost savings.This paper investigates the effects of tile waste on the geotechnical properties of expansive soil, including liquid limit, plastic limit, compaction characteristics, California Bearing Ratio (CBR), and swelling pressure. The study uses locally collected expansive soil mixed with tile waste from 0 to 30% in increments of 10%. The results show that the liquid limit, plastic limit, optimum moisture content, and swelling pressure decrease with increasing tile waste, while the maximum dry density and CBR increase. Specifically, the maximum dry density reaches its peak at 20% tile waste, and the CBR increases by 105% compared to untreated soil. The study concludes that up to 20% tile waste can be effectively used to strengthen expansive soil subgrades in flexible pavement construction, offering significant cost savings.