在高性固体相条件下,在二氧化中对尿解生物催化剂进行工艺工程固定,以便在现场生物矿化
Guang-Zhu Zhang1, Qing-Liang Xu1, Hong-Feng Li1
1School of Civil Engineering and Transportation, Northeast Forestry University, Harbin, 150040, China.
Bioprocess and biosystems engineering
|February 11, 2026
概括
这项研究通过将石灰与微生物诱导的碳酸沉结合起来,增强了有问题的粘土稳定. 这种协同方法提高了粘土的强度,耐用性和柔性,为土木工程应用提供了新的解决方案.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
- 微生物学 微生物学
背景情况:
- 有问题的粘土需要稳定用于施工,通常使用石灰.
- 石灰稳定面临诸如缓慢增强强度,脆性和不良密度等局限性,特别是在性条件下.
- 现有的方法缺乏全面的方法来同时解决这些局限性.
研究的目的:
- 对于有问题的粘土,研究将二氧化固定型尿解微生物诱导碳酸沉 (MICP) 与石灰稳定相结合的协同效应.
- 提高稳定粘土的机械性能,包括强度,柔性和耐久性.
- 阐明负责观察到的性能改进的微观结构机制.
主要方法:
- 用水合石灰和不同百分比的二氧化或基于二氧化的微生物剂制备有问题的粘土混合物.
- 使用尿素-化溶液诱导尿解性MICP以促进碳酸沉.
- 机械性能使用无限制的压力强度,三轴测试和超声波脉冲速度来评估.
- 使用扫描电子显微镜,X射线衍射和热重力测量分析进行了微结构和相位分析.
主要成果:
- 观察到不受限制的压力强度的剂量依赖性改善,微生物治疗显著超过仅使用二氧化的组.
- 三轴测试显示凝聚力和内部摩擦角度大幅增加,表明剪切强度提高.
- 超声波脉冲速度随着固化年龄的增加而增加,这意味着矩阵完整性和密度的改善.
- 微观结构分析显示,形成了一个由酸水合物 (C-S-H) 和碳酸 (CaCO3) 组成的多层次凝固网络,封装了二氧化并使粘土基质变密.
- 故障模式从脆弱的透裂转变为具有凸起的更柔软的扩散裂纹.
结论:
- 尿溶性MICP与石灰稳定剂的整合产生了协同效应,显著提高了有问题的粘土的机械性能.
- 由pozzolanic反应和微生物矿化形成的开发的多尺度化网络提高了强度,延展性和结构完整性.
- 这种方法为优化石灰稳定技术和为各种工程应用开发先进的化增强粘土系统提供了有前途的战略.
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