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| Effects of Fly Ash on Sand Fixation with Microbial-induced Carbonate |
| ZHANG Biao-zhi |
| Research Institute of Highway, China Ministry of Transport, Beijing 100088, China |
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Abstract Different samples of eolian sand were treated to study the sand-fixing effect of microbial-induced mineralization after mixing fly ash with eolian sand. The effects of blending fly ash on microbial-induced mineralization and sand fixation were investigated by measuring permeability, water retention, surface strength, and wind erosion resistance. After three times of microbial-induced mineralization treatment with 30% fly ash, the permeability coefficient decreased by 79.4%, the cumulative evaporation decreased by 26.5%, the surface strength increased by 19.9%, and the wind erosion rate decreased by 21.2%. The yield of calcium carbonate was negatively correlated with wind erosion rate and positively correlated with surface strength. In conclusion, mixing fly ash is more practical than simply using microbial-induced mineralization to fix sand, which can considerably reduce the permeability and improve the water retention, surface strength, and wind erosion resistance of the solidified layer of aeolian sand.
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Received: 12 January 2020
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Corresponding Authors:
ZHANG Biao-zhi
E-mail: bz.zhang@rioh.cn
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2020, Vol. 14 
