Abstract
Microbe-induced calcite precipitation is a sustainable improvement technique for sandy soil, which can alter the properties of sand via microbial activity. In this study, we investigated the loose-sand-consolidation effect by controlling the injection velocity, bacterial and cementing-solution concentrations, and hold times. The results demonstrate that, as the cyclic batch increases, the utilization rate of the bacterial fluid increases and both the optical density (OD600) of the bacteria and urease activity decrease. Moreover, it was determined that a 3-h hold time for a 0.5 mol/L cementing solution with a cementing fluid velocity of 2 mL/min has the greatest bonding effect. The final strength of the loose sand with an increase in calcium carbonate content was further discussed.
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Acknowledgements
This study was supported by the National Key Research & Development Program of China (no. 2016YFC0401904), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (no. 51621092), the National Natural Science Foundation of China (nos. 51309177 and 51409187), and the Program of Introducing Talents of Discipline to Universities (No. B14012).
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Tang, Y., Lian, J., Xu, G. et al. Effect of Cementation on Calcium Carbonate Precipitation of Loose Sand Resulting from Microbial Treatment. Trans. Tianjin Univ. 23, 547–554 (2017). https://doi.org/10.1007/s12209-017-0084-8
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DOI: https://doi.org/10.1007/s12209-017-0084-8