Abstract

Biomineralization has been widely used as an economical, clean and sustainable method for soil consolida-tion. In this paper, calcium carbonate precipitation process was catalyzed by soybean urease, and the mechanical prop-erties and microstructure of the bio-treated sandy silt were evaluated by unconfined compressive strength (UCS) test, scanning electron microscope (SEM). The procedures of deriving soybean crude urease and bio-treatment for soil column samples were performed. The optimum concentra-tion and grouting time of the biological solidification solu-tion were determined. The findings demonstrate that the unconfined compressive strength of bio-treated sample reaches the maximum value of 9.87 MPa at the cement solu-tion concentration of 1.5mol/L and the grouting times of 10. The CaCO3 precipitation formed in the samples gathered at the contact point and the surface of the soil particles. mean-while, it can observe in SEM image that crystal clusters were formed. The above test results provide primary da-tasets and theoretical instruction for the application in the solidification of sandy silt.