生物水泥砂的动态耐用性和材料性能的实验室研究,用于绿色道路基础应用
Fuerhaiti Ainiwaer1, Tianqi Hou1, Rongsong Huang1
1School of Highway, Chang'an University, Xi'an 710064, China.
Materials (Basel, Switzerland)
|September 13, 2025
概括
微生物诱导碳酸盐沉 (MICP) 为路基材料提供了一个可持续的替代方案. 优化的MICP处理提高了土壤的强度和耐用性,满足了道路工程标准.
科学领域:
- 地质技术工程 地质技术工程
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 微生物诱导碳酸盐沉 (MICP) 为土壤稳定提供了一个对波特兰水泥的环保替代方案.
- 有限的研究存在于生物水泥土作为路基材料,特别是关于处理参数对机械和耐用性质的影响.
研究的目的:
- 为了确定生物水泥砂的最佳固化条件,用于道路基层应用.
- 在现实的道路条件下评估生物水泥砂的机械性能和耐久性.
- 阐明生物水泥砂中强度发展的微观结构机制.
主要方法:
- 不受限制的压缩强度 (UCS) 和碳酸含量 (CCC) 测试以确定最佳固化.
- 循环负载电阻的动态三轴测试.
- 道路性能测试 (分裂拉伸强度,结解,温度收缩,形扩张) 和SEM分析.
主要成果:
- 在最佳条件下 (12%的溶液,1:4的BS:CS比率,7d固化) 产生了4.28MPa的强度,满足了路基标准.
- MICP处理改善了岩沙 (AS) 的动态特性,减少了11-46%的塑料应变,并增加了7-31%的弹性模量.
- 在所有道路性能指标上的表现令人满意,并通过SEM观察到通过SEM观察到的增强的粒子间结合.
结论:
- 生物水泥砂显示出作为可持续的路基材料的巨大潜力.
- 优化的MICP处理有效地提高了土壤的机械性能和耐久性,用于道路工程.
- 这些发现支持了生物水泥土在民用基础设施中的实际应用的理论基础.
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