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This paper investigates the stabilization of expansive soil with hydroxy-aluminium (Al13) with Al/soil ratios of 0.10, 0.14, 0.18, 0.22 and 0.26 mmol/g. A series of laboratory tests were conducted to study the effects of Al13 on the mechanical properties of expansive soil, including Atterberg limits, grain size distribution, swell percent, swell pressure and unconsolidated-undrained (UU) triaxial strength. The results revealed that Al13 reduced the plasticity index, clay content and swelling potential and enhanced the shear strength of e