通过低pH生物矿物化的不同沙子的强化
Yongming Lai1,2, Shiyu Liu1, Yanyan Cai1
1College of Civil Engineering, Huaqiao University, Xiamen 361021, China.
Materials (Basel, Switzerland)
|September 28, 2023
概括
优化微生物诱导的石沉 (MICP) 需要根据沙子的特性调整细菌溶液的pH值. 这确保了土壤的增强,提高了工程应用的强度和稳定性.
科学领域:
- 地质技术工程 地质技术工程
- 微生物学 微生物学
- 材料科学 材料科学 材料科学
背景情况:
- 微生物诱导的石沉 (MICP) 是一种有前途的土壤强化技术.
- MICP的有效性受到各种因素的影响,包括沙子特性和细菌溶液参数.
- 了解沙特特征和MICP之间的相互作用对于优化强化结果至关重要.
研究的目的:
- 调查不同沙子特性对低pHMICP钢筋的影响.
- 为了确定不同度的细菌溶液的最佳理论pH值.
- 分析低pH的MICP机制及其与沙特特征的关系.
主要方法:
- 使用优化的细菌溶液,MICP加强了四种不同的沙子类型.
- 评估碳酸的产量和生物化滞后期,以确定最佳的pH值.
- 通过透性,水分保留,耐侵蚀性,透性测试和扫描电子显微镜 (SEM) 评估增强效应.
主要成果:
- 细菌溶液的最佳理论pH值 (0.67,3和10 × 108细胞/毫升) 分别为4.5,3和4.
- 砂类型显著影响了MICP的强化;例如,在特定条件下,尾矿砂的强度高于石英砂.
- 低pH暂时抑制尿酶活性,导致延迟石沉和更均的强化.
结论:
- 沙子的特性对低pH的MICP土壤增强的有效性具有关键影响.
- 根据特定的沙特特征调整细菌溶液的pH值对于最大限度地提高强化效率至关重要.
- 该研究揭示了低pH MICP背后的机制,强调了优化参数对于实际工程应用的重要性.
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