Abstract
Microbially induced carbonate precipitation (MICP) has been extensively studied as a promising technique for soil stabilization. However, the heterogeneity in bio-cementation always hampers the application of MICP. Seawater contains more magnesium ions (Mg2+) than calcium ions (Ca2+) and using magnesium for bio-cementation might be more cost-effective in coastal cities. In this study, the microbially induced magnesium and calcium precipitation (MIMCP) treatment was proposed to solve the problem of heterogeneity, where the urea-magnesium-calcium solution was used as the cementation solution with various Mg2+/Ca2+ ratios. The influences of Mg2+/Ca2+ ratios on pH, bio-flocculation, and chemical conversion efficiency were studied. The sand bio-cementation tests were subsequently conducted to compare the treatment effects with different Mg2+/Ca2+ ratios. Results showed that the increase in Mg2+/Ca2+ ratios resulted in lower pH levels and smaller percentages of bio-flocculation. The higher Mg2+/Ca2+ ratio also provided a longer lag period, regardless of biomass concentrations; however, the chemical conversion efficiency decreased. Furthermore, the increased Mg2+/Ca2+ ratios resulted in a small difference in UCS and contents of precipitation at different parts of bio-cemented soils, achieving better homogeneity in bio-cementation. However, the strength significantly decreased at an Mg2+ concentration over 0.8 M due to much smaller contents of precipitation. In addition, with increased Mg2+/Ca2+ ratios, more aragonite in calcium precipitation was produced. The proposed MIMCP method in this study was significant to improve the homogeneity of bio-cemented soil in practical engineering applications.
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Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors thank the valuable comments from the reviewers. This study was funded by the National Natural Science Foundation of China (grant number 51578147), Fundamental Research Funds for the Central Universities (grant number 2242020R20025), Science and Technology Department of Ningxia (grant number 2020BFG02014), and the Transportation Department of Ningxia (grant number 202000173).
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Xiaohao Sun and Linchang Miao conceived and designed the research. Hengxing Wang, Ziming Cao, and Linyu Wu conducted experiments. Xiaohao Sun and Hengxing Wang analyzed data and wrote the manuscript. Linchang Miao and Jian Chu reviewed and edited the manuscript. All authors read and approved the manuscript
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Sun, X., Miao, L., Wang, H. et al. Study on the influence of magnesium/calcium ratios on bio-cemented sandy soils. Acta Geotech. (2024). https://doi.org/10.1007/s11440-024-02248-5
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DOI: https://doi.org/10.1007/s11440-024-02248-5