Scientific Development Research

To address the resourceization of two types of solid wastes, carbide slag and aeolian sand, this study introduces carbide slag as a supplementary calcium source material into Microbially Induced Carbonate Precipitation (MICP) technology and investigates its influence on the reinforcement effectiveness of aeolian sand. Using a single-factor variable method, four carbide slag content gradients of 5%, 10%, 15%, and 20% were established, and the mechanical properties of specimens under different content conditions were systematically evaluated through unconfined compressive strength tests. The experimental results show that when the carbide slag content increases from 0% to 15%, the specimen strength rises from 0.37 MPa to 0.65 MPa, representing an increase of 75.7%; however, when the content increases to 20%, the strength decreases to 0.46 MPa. The study demonstrates that 15% is the optimal content, at which the high calcium content and moderate alkaline environment of carbide slag synergistically contribute to peak carbonate precipitation efficiency; excessive addition leads to strength reduction due to the inhibition of microbial activity by the strongly alkaline environment. This research provides theoretical foundation and technical reference for solid waste resourceization and engineering applications of MICP technology.

Microbially induced carbonate precipitation (MICP); Carbide slag; Aeolian sand; Solid waste resource utilization; Unconfined compressive strength