Experimental Research of Mechanics and Microscopic on Nansha Soft Soil Reinforced with Cement-based Curing Agent

摘要

Based on ordinary Portland cement, in this paper, direct shear test and unconfined compression test were conducted on Nansha Guangzhou soft silt blended with admixtures such as lime or gypsum respectively to research its mechanical property and get the correlation between reinforced silt's internal friction angle (IFA), cohesion, unconfined compressive strength (UCS) and mixing ratio or age, scanning electron microscope observation (ESM) was conducted to research the different microstructure characteristics of different reinforced silt. The results show that data trending was similar to the outcome while cement was blended in merely. Mechanical parameters of the reinforced silt increase when the mixing ratio or curing age increases. But different curing agent has different influence. Lime has the best effect on long-term strength. As far as early age strength is concerned, gypsum has the best reinforcement effect and gypsum takes second place. For a certain strength requirement, gypsum can reduce the consumption of cement at a certain degree. The research result has a certain reference value for similar research and engineering.