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Water treatment sludge is a by-product of the drinking water treatment process, and it has been considered as a waste for water authorities around the world. This study aims to investigate the reuse of aluminium-based water treatment sludge (AS) as a soil replacement in road construction which can improve sustainable waste management practices for positive environmental outcomes. To evaluate the potential reuse of AS, a 50/50 mixture ratio of AS and clay (CL) was selected and tested for geotechnical engineering parameters through Odometer Tests, Unconfined Compression Strength Tests, Static triaxial, Cyclic triaxial and California Bearing Ratio. Detailed physical and chemical were also conducted with the water treatment sludge. Results suggest that combining AS with CL increases the optimal moisture content and decreases the dry density of the soil. Oedometer tests indicated that the CLAS mixture …