Optimization of Cement-Slag-Based Stabilizer Proportions and Macro-Micro Properties Research of Solidified Soil

In response to the high energy consumption and large carbon emissions of traditional cement materials, this paper takes slag micro-powder as the main raw material, supplemented by cement and gypsum, and uses the D-optimal mixture design method to optimize the mix ratio. It systematically studies the solidification performance of slag-based cementitious materials on Guangzhou silt. Through unconfined compressive strength and fluidity tests, the optimal main material ratio is determined to be m(slag):m(cement):m(gypsum) = 57:30:13, and 4% sodium silicate is selected as the activator. Microstructure analysis shows that this system can effectively promote the formation of C-S-H gel and ettringite, significantly improving the compactness and cementation performance of the soil. The study also shows that this material outperforms traditional cement in terms of strength, environmental friendliness, and economy, and has good engineering application prospects.