通过洗砂污泥制备的液化固化土壤的研究:工程性能,固化机制和环境影响
Yidan Mao1, Guangwei Yu2, Cheng Yu3
1State Key Laboratory of Advanced Environmental Technology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Environmental research
|August 2, 2025
概括
这项研究使用水泥和工业废物将洗砂污泥 (SWS) 转化为液化固化土壤 (FSS). 由此产生的材料具有出色的强度和环境安全性,为废物利用提供了可持续的解决方案.
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:
- 洗砂污泥 (SWS) 是沙子生产的大量废物副产品,带来了重大的环境挑战.
- 对可持续废物管理和循环经济原则而言,SWS的有效资源利用至关重要.
研究的目的:
- 使用普通波特兰水泥 (OPC) 和工业固体废物 (ISW) 将洗砂污泥 (SWS) 稳定成液化固化土壤 (FSS).
- 系统地评估准备好的FSS的工程性质,微观结构和环境安全.
- 建立基于SWS的固化材料应用的理论基础.
主要方法:
- 通过混合SWS,OPC和ISW (尾矿,煤炭飞灰,磨砂颗粒高炉渣,碳化残留物) 的混合物来制备FSS.
- 系统评估FSS属性,包括流动性,机械强度 (不受限制的压力强度,分裂强度) 和弹性模量.
- 微观结构分析和环境影响评估,包括重金属漏试验.
主要成果:
- 最佳的SWS:OPC:ISW质量比为20:2:1,产生了FSS,其不受限制的压力强度为0.82MPa,裂变强度为0.64MPa,弹性模量为242MPa.
- 开发的FSS符合中国标准T/CMEA 32-2023.3的结构填充材料的强度要求.
- 加入ISW提高了机械强度,有效地固定了重金属,漂水度低于监管值,生态风险低.
结论:
- SWS,OPC和ISW的协同作用组合有效地将废物污泥转化为高性能固化土壤.
- 准备好的FSS是一种安全和环保的材料,适用于结构填充应用.
- 这项研究为SWS资源利用提供了可行的解决方案,并促进了固化土壤材料的开发.
相关概念视频
01:20Slump Test
426
The slump test is a widely used method to measure the workability of concrete. It employs a 12-inch high truncated cone mold that tapers from eight inches at the base to four inches at the top. Before testing, the mold is securely attached to a flat base and dampened.
Concrete is poured into the mold in three layers to conduct the test. Each layer is compacted 25 times with a steel tamping rod, which has a five-eighths-inch diameter and a rounded end, to ensure even distribution and eliminate...
Concrete is poured into the mold in three layers to conduct the test. Each layer is compacted 25 times with a steel tamping rod, which has a five-eighths-inch diameter and a rounded end, to ensure even distribution and eliminate...
426
01:14Testing Water Quality
185
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
185