Effect analysis of using microbial cement to consolidate different sands under different preparation processes

Different loose particles and preparation processes will affect the consolidation effect of microbial cement.Therefore, in this paper, the appearance of sea sand, river sand and coral sand were analyzed by super depth of field microscope, and the influence of three particles on microbial adsorption were studied.The compressive strength, calcite content, penetration rate and micro structure of microbial cement consolidated sand columns prepared by pouring process and mixing process were analyzed respectively.The results showed that coral sand particles had the best microorganisms absorption, and the pores between particles were more easily filled with calcium carbonate crystals.Compared with sea sand column and river sand column, the consolidation effect of coral sand column was better under the two preparation processes of pouring and mixing, the compressive strength was 1.45 MPa and 2.07 MPa respectively, and the calcite content was 4.19% and 0.99% respectively, the infiltration rate was reduced to 0 after consolidation.The uniformity of microbial cement-based materials prepared by mixing process was better than that prepared by pouring process, and the operation was simpler.