This study investigates the effects of tile waste on the engineering properties of expansive soil, including liquid limit, plastic limit, compaction characteristics, California Bearing Ratio (CBR), and swelling pressure. Expansive soil collected locally was mixed with tile waste at 0–30% increments of 10%. Test results showed that as the percentage of tile waste increased, the liquid limit, plastic limit, optimum moisture content, and swelling pressure decreased, while the maximum dry density and CBR increased. These findings indicate that adding tile waste can improve the engineering properties of expansive soil, making it more suitable for use as a subgrade material in flexible pavements. The study also references previous research on the use of various waste materials, such as marble dust, foundry sand, fly ash, and granite dust, in improving the properties of expansive soil. These materials have been shown to reduce swelling, increase CBR, and improve overall stability. Additionally, the use of vitrified polish waste has been found to significantly improve the plasticity index, liquid limit, shrinkage limit, and CBR of marine clay. The study concludes that up to 20% tile waste can be effectively used to strengthen expansive soil subgrade for flexible pavements, resulting in cost savings and reduced waste accumulation. The results suggest that the addition of tile waste can enhance the engineering properties of expansive soil, making it a viable option for subgrade material in road construction. The study also highlights the importance of utilizing industrial waste materials to mitigate the problems associated with expansive soils.This study investigates the effects of tile waste on the engineering properties of expansive soil, including liquid limit, plastic limit, compaction characteristics, California Bearing Ratio (CBR), and swelling pressure. Expansive soil collected locally was mixed with tile waste at 0–30% increments of 10%. Test results showed that as the percentage of tile waste increased, the liquid limit, plastic limit, optimum moisture content, and swelling pressure decreased, while the maximum dry density and CBR increased. These findings indicate that adding tile waste can improve the engineering properties of expansive soil, making it more suitable for use as a subgrade material in flexible pavements. The study also references previous research on the use of various waste materials, such as marble dust, foundry sand, fly ash, and granite dust, in improving the properties of expansive soil. These materials have been shown to reduce swelling, increase CBR, and improve overall stability. Additionally, the use of vitrified polish waste has been found to significantly improve the plasticity index, liquid limit, shrinkage limit, and CBR of marine clay. The study concludes that up to 20% tile waste can be effectively used to strengthen expansive soil subgrade for flexible pavements, resulting in cost savings and reduced waste accumulation. The results suggest that the addition of tile waste can enhance the engineering properties of expansive soil, making it a viable option for subgrade material in road construction. The study also highlights the importance of utilizing industrial waste materials to mitigate the problems associated with expansive soils.