Abstract: The basalt stone powder (BSP) is a waste material produced by quarries in the process of cutting basalt, and the accumulation of large amounts of stone powder not only occupies land but also pollutes the environment and wastes resources. To effectively utilize the BSP, this study used BSP as a modifier in order to prepare the basalt stone powder cement soil (BSPCS). The effect of the BSP content on the hydrostatic properties such as stressstrain, the compressive strength and the modulus of elasticity of the hydraulic soil were investigated by means of the unconfined compressive tests. The results show that the BSP as a modifier can significantly improve the mechanical properties of the hydraulic soil. With the increase of the BSP content, the stress-strain, the compressive strength and the modulus of elasticity of the BSPCS specimens showed a trend of increasing and then decreasing. The best mechanical properties of the BSPCS samples were obtained when the BSP content was 12%. Meanwhile, with the increase of the age of maintenance, the peak strain of the BSPCS specimens was obviously shifted to the left, and the brittleness of the BSPCS specimens increased. However, the mechanical properties of the BSPCS specimens under each specified amount were significantly improved, in which the unconfined compressive strength of the BSPCS-12 specimens could meet the strength requirements of secondary roads and below in the Technical Specifications for the Construction of Highway Pavement Subgrade (JTG/T F20-2015). The conclusion of the study can provide a strong theoretical support for the application of the BSP-modified hydraulic soil.

Key words: Basalt Stone Powder, Cement Soil, Compressive Strength, Elastic Modulus