Study on reinforcement of soil for suppressing fugitive dust by bio-cementitious material

4th International Conference on Advanced Composite Materials and Manufacturing Engineering 2017

材料科学;化学

Zhan, Qiwei^1,2 ; Qian, Chunxiang^1,2

School of Materials Science and Engineering, Southeast University, Nanjing, China^1

Research Institute of Green Construction Materials, Southeast University, Nanjing, China^2

关键词: Cementitious materials;    Environmental friendly methods;    Freeze-thaw resistance;    Fugitive dust;    Mass loss ratio;    Rainfall erosion;    Residual ratios;    Simple operation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/207/1/012106/pdf
DOI  :  10.1088/1757-899X/207/1/012106

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Microbial-induced reinforcement of soil, as a new green and environmental-friendly method, is being paid extensive attention to in that it has low cost, simple operation and rapid effects. In this research, reinforcement of soil for suppressing fugitive dust by bio-cementitious material was investigated. Soil cemented by bio-cementitious material had superior mechanical properties, such as hardness, compressive strength, microstructure, wind-erosion resistance, rainfall-erosion resistance and freeze-thaw resistance. The average hardness of sandy soil, floury soil and clay soil is 18.9, 25.2 and 26.1, while average compressive strength of samples is 0.43 MPa, 0.54 MPa and 0.69 MPa, respectively; meanwhile, the average calcite content of samples is 6.85 %, 6.09 %, and 5.96 %, respectively. Compared with the original sandy soil, floury soil and clay soil, the porosity decreases by 38.5 %, 33.7 % and 29.2 %. When wind speed is 12 m/s, the mass loss of sandy soil, floury soil and clay soil cemented by bio-cementitious material are all less than 30 g/(m2•h). After three cycles of rainfall erosion of 2.5 mm/h, the mass loss are less than 25 g/(m2•h) and the compressive strength residual ratio are more than 98.0 %. Under 25 cycles of freeze-thaw, the mass loss ratio are less than 3.0 %.