Experimental Study on the Effects of Fly Ash on Sand Fixation with Microbial Induced Carbonate Precipitation

• Published in: IOP conference series. Materials Science and Engineering 2020-03, Vol.794 (1), p.12037
• Main Authors: Biaozhi, Zhang, Jiaming, Zhang, Guoqing, Zhang, Zheng, Li, Jikang, Zhu, Yang, Zhou
• Format: Article
• Language: English
• Subjects: Blending effects; Calcium carbonate; Eolian sands; Erosion rates; Erosion resistance; Fixation; Fly ash; Microorganisms; Mineralization; Permeability; Wind erosion; Wind resistance
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/794/1/012037

In order to study the sand-fixing effect of microbe induced mineralization after mixing fly ash with eolian sand, different samples of eolian sand were treated. The effects of blending fly ash on microbially induced mineralization and sand fixation were evaluated based on the comparison of permeability, water retention, surface strength, and wind erosion resistance. After three times of microbial induced mineralization treatment with 30% fly ash contained, it showed:(1)the permeability coefficient decreased by 79.4%;(2) the cumulative evaporation decreased by 26.5%;(3)the surface strength increased by 19.9%;(4)and the wind erosion rate decreased by 21.2%. The yield of calcium carbonate was negatively correlated with the wind erosion rate and positively correlated with the surface strength. From the experiment, it can be concluded that mixing fly ash is more practical than simply using microbial induced mineralization to fix sand, which can significantly reduce the permeability, improve the water retention performance, improve the surface strength and wind erosion resistance of the solidified layer of aeolian sand.