回收挖掘土壤作为可持续的补充水泥材料:高酸盐含量和性能影响
Li Ling1,2, Jindong Yang3, Wanqiong Yao4
1Key Laboratory of Coastal Urban Resilient Infrastructures (Shenzhen University), Ministry of Education, Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China.
Materials (Basel, Switzerland)
|May 25, 2024
概括
超过53.39%的高酸盐含量化挖掘土壤可以创建可持续的补充水泥材料 (SCM). 这些材料提高了砂质量,为建筑提供了更绿色的替代方案.
科学领域:
- 建筑材料科学 建筑材料科学
- 地质技术工程 地质技术工程
- 环境科学 环境科学
背景情况:
- 全球城市化产生了大量的挖掘土壤,这给环境带来了挑战.
- 将烧焦的挖掘土壤重新利用为补充性水泥材料 (SCM) 是一种可持续的解决方案.
- 现有的研究缺乏对土壤变异性对SCM性能影响的系统分析.
研究的目的:
- 系统地评估使用来自中国南部化挖掘土壤的砂的压力强度,波佐兰反应性和微结构发展.
- 确定土壤的关键性质,特别是高酸盐含量,以确定其适用性为SCM.
- 评估挖掘土壤作为水泥粘合剂可持续替代品的潜力.
主要方法:
- 来自中国南部四个城市的烧焦挖掘土壤的实验.
- 砂制备和固化长达28天.
- 压力强度的分析,pozzolanic反应性 (XRD,FTIR,ssNMR) 和微观结构的发展 (MIP,SEM).
主要成果:
- 与普通水泥混合物相比,高酸盐含量> 53.39%的土壤产生的砂质量相同或更高.
- 在高高的高酸盐含量下观察到增强的pozzolanic反应性和微结构密度.
- 精制的孔隙结构和改进的水化反应有助于提高砂性能.
结论:
- 考利尼特含量,特别是含量,是挖掘土壤作为SCM的生存能力的关键指标.
- 具有足够高酸盐的化挖掘土壤提供了可持续和有效的补充水泥材料.
- 这项研究通过提升挖掘土壤废物的价值来支持可持续的建筑实践.
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