Abstract: Cement mixed soil is widely used in construction projects because of its low cost and excellent performance, but there are still some problems such as relative low strength and large deformation. Nanomaterials are one of the focus on the current research in the field of building materials. Proper addition of nanomaterials to cement mixed soils can effectively improve their mechanical properties. This paper primarily analyzes and summarizes the mechanical properties of cement mixed soils modified by nanoSiO₂, nanoMgO and nan Al₂O₃. The conclusions show that: (1) The optimum content of nanomaterials is related to the cement content, moisture content and physical properties of cement mixed soils; (2) The soils with a nanoSiO₂ content between 3% and 4% can effectively improve the strength of the cement mixed soil; (3) The optimum incorporation ratio of nano MgO cement-modified soil is 1%. (4) The optimum content of nano Al₂O₃ cement-modified soil is between 2.5% and 4%.

Key words: Cement Mixed Soils, Nanomaterials, Compressive Strength, Shear Strength