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硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (3): 845-853.

所属专题: 水泥混凝土

• 水泥混凝土 • 上一篇    下一篇

不同环境下碳铝酸钙的稳定性研究

余海燕1,2, 徐晴1, 王英翔1, 董德宇1   

  1. 1.天津城建大学材料科学与工程学院,天津 300384;
    2.天津城建大学建筑绿色功能材料天津市重点实验室,天津 300384
  • 收稿日期:2022-10-19 修订日期:2022-12-02 出版日期:2023-03-15 发布日期:2023-03-31
  • 作者简介:余海燕(1971—),男,博士,教授。主要从事绿色建材的研究。E-mail:yuhy858@tcu.edu.cn
  • 基金资助:
    “十三五”科技支撑计划(2018YFD1101002-03)

Stability of Calcium Carboaluminate under Different Environments

YU Haiyan1,2, XU Qing1, WANG Yingxiang1, DONG Deyu1   

  1. 1. School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China;
    2. Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, Tianjin 300384, China
  • Received:2022-10-19 Revised:2022-12-02 Online:2023-03-15 Published:2023-03-31

摘要: 氯离子引发的钢筋锈蚀是影响钢筋混凝土耐久性的重要因素之一,化学固结法是从根本上解决氯离子对钢筋混凝土结构侵蚀作用的主要方法。通过X射线衍射分析、热重分析、扫描电子显微镜和化学分析对不同环境下碳铝酸钙的稳定性进行研究。结果表明,碳铝酸钙呈六方片状,在低于120 ℃时具有良好的热稳定性,在氯盐和硫酸盐溶液中很不稳定,碳铝酸钙中的CO2-3容易被Cl-和SO2-4取代生成Friedel’s盐和钙矾石。碳铝酸钙在酸性环境中不稳定,会与酸发生化学反应,在pH≥11的碱性环境中可以稳定存在。

关键词: 碳铝酸钙, 氯离子, 稳定性, Friedel’s盐, 钙矾石, 钢筋锈蚀

Abstract: The corrosion of reinforcement caused by chloridion is one of the most important factors affecting the durability of reinforced concrete. Chemical consolidation method is the main method to solve the erosion effect of chloridion on reinforced concrete structures. The stability of calcium carboaluminate under different environments was studied by X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy and chemical analysis. The results show that calcium carboaluminate is hexagonal plate and has good thermal stability below 120 ℃. But calcium carboaluminat is very unstable in chloride and sulfate solutions, and the CO2-3 in calcium carboaluminate is easily replaced by Cl- and SO2-4 to form Friedel’s salt and ettringite. Calcium carboaluminate is unstable in acidic environment, and will react with acid chemically. It is stable in alkaline environment with pH≥11.

Key words: calcium carboaluminate, chloridion, stability, Friedel’s salt, ettringite, corrosion of reinforcement

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