Abstract: To study the physical and engineering properties of the improved soil under different chemical additives and dry-wet cycles conditions, this paper summarizes the state-of-the-art research of improved soils. Soil sample with different amounts of cement, lime and fly ash are reviewed and the impact of these additives on the physical and mechanical properties of improved soils are investigated. At the same time, the physical and mechanical properties red mud with various amounts of additives are also investigated.

Key words: Improved Soil, Red Mud, Physical and Mechanical Properties, Modifications