磁铁尾矿砂在水泥基材料中的化学稳定性研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3688-3694.

磁铁尾矿砂在水泥基材料中的化学稳定性研究

郝明月¹, 李静^1,2, 蔡基伟^1,3, 许鸽龙^1,3, 田青^1,3

1.河南大学土木建筑学院,开封 475004;
2.河南轻工职业学院,郑州 450008;
3.河南大学开封市工程修复与材料循环工程技术研究中心,开封 475004

收稿日期:2023-05-24 修订日期:2023-07-28 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 许鸽龙,博士,副教授。E-mail:henu2020@yeah.net
作者简介:郝明月(1997—),女,硕士研究生。主要从事循环与功能建筑材料的研究。E-mail:1245885357@qq.com
基金资助:
河南省科技发展计划(152102210053);2021年河南省科学院科技开放合作项目(210909015);河南省科技攻关计划(222102320362)

Chemical Stability of Magnetite Tailings in Cement-Based Materials

HAO Mingyue¹, LI Jing^1,2, CAI Jiwei^1,3, XU Gelong^1,3, TIAN Qing^1,3

1. School of Civil and Architectural Engineering, Henan University, Kaifeng 475004, China;
2. Henan Vocational College of Light Industry, Zhengzhou 450008, China;
3. Kaifeng Research Center for Engineering Repair and Material Recycling, Henan University, Kaifeng 475004, China

Received:2023-05-24 Revised:2023-07-28 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 为评价磁铁尾矿砂在水泥碱性环境中的化学稳定性,研究了磁铁尾矿砂对饱和Ca(OH)₂溶液pH值、砂浆棒膨胀率及钢筋锈蚀率的影响。结果表明,粒径为2.500和1.250 mm的磁铁尾矿砂在早期时对饱和Ca(OH)₂溶液pH值降低作用较为明显,随龄期延长,粒径小于1.250 mm的磁铁尾矿砂对溶液pH值的降低作用变得愈加显著。不同粒径的磁铁尾矿砂取代部分天然砂时,引起的砂浆棒膨胀情况有所不同,其中粒径为0.630和0.315 mm的磁铁尾矿砂对砂浆棒体积变形的影响更为显著,而且在较长龄期后,含有0.630 mm磁铁尾矿砂的砂浆棒膨胀率最大。在Ca(OH)₂和NaCl混合溶液中,磁铁尾矿砂较钢筋更易发生反应,可减缓钢筋锈蚀。

关键词: 磁铁尾矿砂, 化学稳定性, 快速砂浆棒法, 体积膨胀, 钢筋锈蚀

Abstract: In order to evaluate the chemical stability of magnetite tailings in alkaline environment of cement, the influences of magnetite tailings on pH value of saturated Ca(OH)₂ solution, expansion rate of mortar bars, and corrosion rate of reinforcement were studied. The results show that the magnetite tailings with particle sizes of 2.500 and 1.250 mm have more significant effect on the decrease of pH value of saturated Ca(OH)₂ solution in early stage. With the extension of age, the effects of magnetite tailings with particle size below 1.250 mm on the decrease of pH value become more significant. When magnetite tailings with different particle sizes replace parts of natural sand, the expansion of mortar bars is different. The influences of magnetite tailings with particle sizes of 0.630 and 0.315 mm on the volume deformation of mortar bars are more significant. Moreover, the mortar bar expansion rate of magnetite tailings with particle size of 0.630 mm is the largest after a longer age. In a mixed solution of Ca(OH)₂ and NaCl, the magnetite tailings react more readily than reinforcement, which can slow down the corrosion of reinforcement.

Key words: magnetite tailing, chemical stability, accelerated mortar bar method, volume expansion, reinforcement corrosion

中图分类号:

TU528

郝明月, 李静, 蔡基伟, 许鸽龙, 田青. 磁铁尾矿砂在水泥基材料中的化学稳定性研究[J]. 硅酸盐通报, 2023, 42(10): 3688-3694.

HAO Mingyue, LI Jing, CAI Jiwei, XU Gelong, TIAN Qing. Chemical Stability of Magnetite Tailings in Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3688-3694.

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