在复合固化剂修改下,合石膏水泥糊的抗水性和水化机制的补充
Shulong Liu1, Yiming Wang1, Aixiang Wu2
1School of Resources and Safety Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Key Laboratory of Safe and Green Mining of Metal Mines with Cemented Paste Backfill, National Mine Safety Administration, University of Science and Technology Beijing, Beijing, 100083, China.
Environmental research
|September 8, 2025
概括
一种新的固化剂 (CA) 通过增强耐水性和机械强度,显著改善了基于的水泥糊补充剂 (PCPB). 这解决了其在矿山工程中的使用的关键局限性,确保了安全和环境合规性.
科学领域:
- 材料科学 材料科学 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:
- 合石 (PG) 是一种副产品,有可能在大规模使用在水泥糊补充 (CPB) 中.
- 基于PG的CPB (PCPB) 的耐水性较差限制了其机械强度,并促进了离子漏,阻碍了矿山工程应用.
- 现有的PCPB配方需要提高耐水性和机械性能,以便更广泛地采用.
研究的目的:
- 为了合成一种新的固化剂 (CA) 来修改.
- 调查CA含量和浸泡时间对PCPB属性的影响.
- 评估CA修改PCPB的机械性能和漏行为.
主要方法:
- 使用甲基酸,酸和聚化 (PAC) 合成一种固化剂 (CA).
- 用合成的CA.修改基石的修改.
- 在不同的CA含量和浸泡时间下测试水吸收,软化系数,机械性能 (压缩,曲,抗拉强度,弹性模量) 和总可溶性酸盐 (TP) 和离子 (F) 的浸出.
主要成果:
- 添加CA改善了水分和孔隙结构,导致减少水的吸收和增加软化系数.
- 最佳性能 (最小吸水率4.62%,最大软化系数0.97) 通过3%的CA和1天浸泡实现.
- 28天的压力强度超过了0.5 MPa的要求,在56天使用2% CA时达到峰值强度 (6.08 MPa).
- 水中的TP和F度符合I级环境标准.
结论:
- 开发的固化剂有效地提高了基石基水泥的耐水性和机械强度.
- 经CA修改的PCPB符合矿山填埋工程和环境法规的关键性能标准.
- 这项研究为在可持续的矿山填充应用中利用石膏提供了可行的解决方案.
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