微生物胶凝材料固结性能及其抑尘研究

Study on consolidation performance and dust suppressionof microbial cementitious materials

采用微生物胶凝材料固结松散土颗粒,研究微生物诱导矿化产物特性,分析微生物胶凝材料固结形成固结层的力学性能、抗风蚀性能、保湿性能和抗冻融性能.微生物胶凝材料固结松散土形成的固结层中除了二氧化硅、氧化铝等物相以外,出现了新的物相方解石,这是微生物胶凝材料固结松散介质的本质原因;微生物胶凝材料的最适宜的用量为1.6 kg/m^(2),微生物胶凝材料固结土形成的固结层具有良好的抗风蚀性能,风力侵蚀下质量损失大幅改善,固结层兼具保湿性能和抗冻融性.

In this paper,microbial cementitious materials were used to cement loose soil particles.The characteristics of mineralization product induced by microorganism was studied,and the mechanical properties,wind erosion resistance,moisture retention and freeze-thaw resistance of the consolidated layer formed by microbial cementitious materials were analyzed.Aside from silica,alumina and other phases,a new phase of calcite appeared in the consolidation layer,which was the essential reason for microbial cement cemented loose medium.The results showed that the optimum dosage of microbial cementitious materials was 1.6 kg/m^(2).The consolidation layer had good wind erosion resistance,and the mass loss was greatly improved under wind erosion.At the same time,the consolidation layer had both water-retention and freeze thaw resistance.