| description abstract | To promote resource utilization and environmental protection of Pisha sandstone and effectively control soil erosion in the Yellow River Basin, this research employs enzyme-induced calcium carbonate precipitation (EICP) to cure Pisha sandstone. A new curing method is proposed: mixing jack bean powder with Pisha sandstone, followed by spraying with a cementing solution. The curing effects of various jack bean dosages and curing methods were evaluated based on cured-layer volume, calcium carbonate mass, penetration strength, and water stability. The influence of different curing methods on EICP curing effects was examined through X-ray diffraction, field-emission scanning electron microscopy, Fourier-transform infrared spectroscopy, and heat loss analysis. Results indicated that the mixing method yields the best curing effect and water stability when the jack bean powder–Pisha sandstone mass ratio is 1:30. Compared with the measures for step-by-step grouting, the calcium carbonate mass, cured-layer volume, and penetration strength for the proposed method were 9.26%, 100%, and 140% higher, respectively, while the final disintegration coefficient for the proposed method was 8% lower. The mixing method effectively reduced the precipitation rate of calcium carbonate, mitigating the blockage of pore channels that limits a cementing solution’s infiltration into deeper layers. Micromechanism analysis showed that the mixing method forms calcium carbonate cluster crystals, improving the bonding between loose Pisha sandstone particles. Overall, this study provides a theoretical basis for using EICP in controlling soil erosion in Pisha sandstone. | |
