离子土壤稳定剂对水泥和水泥稳定铁土壤的影响:水化差异和机械性能
Hongtu Li1,2, Jian Jia1,2, Xiaolei Lu1,2
1Shandon Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China.
Materials (Basel, Switzerland)
|April 24, 2025
概括
离子土壤稳定剂 (ISS) 提高了铁尾矿与水泥的土壤稳定性,提高了机械性能. 然而,ISS可以削弱水泥砂,但通过增加密度和强度来使水泥稳定铁尾部受益.
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
- 土壤稳定 土壤稳定
背景情况:
- 由于其机械性能差,铁尾矿存在工程挑战.
- 水泥材料通常用于土壤稳定,但它们的有效性可能有限.
- 离子土壤稳定剂 (ISS) 被探索作为一种添加剂,以改善基于水泥的土壤稳定.
研究的目的:
- 为了研究离子土壤稳定剂 (ISS) 对水泥水化和铁尾矿土壤颗粒相互作用的影响.
- 阐明ISS增强水泥稳定铁尾矿土壤机械性能的机制.
- 为了评估ISS对铁尾矿土壤工程特征的影响.
主要方法:
- 异热热量计被用来研究水泥水化动力学.
- 通过X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 分析材料结构.
- 低场核磁共振 (LF-NMR),X射线光电谱 (XPS),非可蒸发的水含量,以及量化表面和化学相互作用的Zeta潜力.
主要成果:
- 国际空间站的添加对水泥砂的机械性能产生了负面影响,在国际空间站的1.67%,由于与Ca2+阻碍水解的碳氧化物复合,将7天的压力强度降低了59.8%,而国际空间站的1.67%则降低了59.8%.
- 在水泥稳定铁尾矿土壤中,ISS显示出积极的修饰效应,最大干密度增加6.5%,7天不限压力强度增加35.3%,在0.33%的ISS.
- 国际空间站减少了双电层,土壤颗粒之间的静电排斥和多孔性,同时增加了颗粒接触和降低了水化反应障碍.
结论:
- 离子土壤稳定剂 (ISS) 具有双重效应:它延迟了纯水泥系统中的水泥水化,但有益地改变了水泥稳定铁尾矿土壤.
- 国际空间站通过减少粒子间排斥和优化土壤-水泥矩阵中的水分来提高铁尾矿土壤的紧性和强度,从而提高土壤的机械性能.
- 这些发现突显了ISS作为一种有效的添加剂的潜力,可以改善与水泥结合的铁尾矿等有问题的土壤的工程特性.
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