This document discusses research into the effect of adding ceramic dust to clayey soil on the geotechnical properties of the soil. The researchers prepared soil samples with various proportions of ceramic dust added to clayey soil. They found that the Atterberg limits, optimum moisture content, and swelling index of the clayey soil decreased with the addition of ceramic dust. Meanwhile, the maximum dry and soaked California Bearing Ratio (CBR) values increased with the addition of ceramic dust up to 20%. Addition of more than 20% ceramic dust had negative effects on these strength properties. The researchers concluded that up to 20% ceramic dust can be used to improve the detrimental properties of clayey soil.