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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (6): 1959-1967.DOI: 10.16552/j.cnki.issn1001-1625.2025.1246

• 水泥混凝土 • 上一篇    下一篇

铝相对钙矾石生长调控及稳定性研究

唐佩1(), 赵东升2, 陈伟1   

  1. 1.武汉理工大学硅酸盐科学与先进建材全国重点实验室,武汉 430070
    2.武汉理工大学材料科学与工程学院,武汉 430070
  • 收稿日期:2025-12-15 修订日期:2026-02-10 出版日期:2026-06-15 发布日期:2026-07-14
  • 作者简介:唐佩(1987—),女,博士,研究员。主要从事生态建筑材料的研究。E-mail:pei-tang@whut.edu.cn
  • 基金资助:
    国家重点研发计划项目(2022YFC3902705);湖北省技术创新计划项目(2024BCB084)

Regulation and Stability of Ettringite Growth by Aluminum Phases

TANG Pei1(), ZHAO Dongsheng2, CHEN Wei1   

  1. 1.State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China
    2.School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China
  • Received:2025-12-15 Revised:2026-02-10 Published:2026-06-15 Online:2026-07-14

摘要:

钙矾石是硫酸盐基低碳胶凝材料的主要水化产物,对材料力学性能、耐久性等有重要影响,探究钙矾石的形成与演化过程至关重要。铝相常被用作调控钙矾石生长的关键组分,现有研究多关注外掺铝相对低碳胶凝材料宏观性能的提升,而对钙矾石的形成机制尚需深入完善。本文以六水氯化铝(AC)、十八水合硫酸铝(AS)、聚合硫酸铝(PAS)、偏铝酸钠(NA)四种铝相为原料合成钙矾石,并研究铝相种类对合成钙矾石生长行为及稳定性的影响。结果表明:60 ℃是钙矾石的最佳合成温度,其中AS参与形成的钙矾石质量分数最高,为94.23%;与其他铝相相比,AS参与形成的钙矾石晶体最大失重温度为120.4 ℃,热稳定性最优,晶体结构更稳定,长径比变化幅度小,分布在14.5左右。本研究为后续低碳胶凝材料体系的优化设计与性能提升提供了理论基础。

关键词: 铝相, 钙矾石, 生长调控, 合成温度, 稳定性, 晶体尺寸

Abstract:

Ettringite is the main hydration product of sulfate-based low-carbon cementitious materials and has a significant impact on the mechanical properties and durability of the materials. It is crucial to explore the formation and evolution process of ettringite. Aluminum phase is often used as a key component to regulate the growth of ettringite. Existing studies mostly focus on the improvement of the macroscopic performance of low-carbon cementitious materials by adding external aluminum phase, while the formation mechanism of ettringite by it still needs to be further improved. This paper synthesized ettringite using four types of aluminum phases, namely, crystalline aluminum chloride (AC), aluminum sulfate octadecahydrate (AS), polymeric aluminum sulfate (PAS), and sodium aluminate (NA), as raw materials, and investigated the influence of the type of aluminum phase on the growth behavior and stability of the synthesized ettringite. The results show that 60 ℃ is the optimal synthesis temperature for ettringite formation, and the mass fraction of ettringite formed with AS participation is the highest, reaching 94.23%. Compared with other aluminum phases, the maximum weight loss temperature of ettringite formed with AS participation is 120.4 ℃, with the best thermal stability, more stable crystal structure, and a smaller variation in the aspect ratio, which is around 14.5. This study provides a theoretical foundation for the subsequent optimization design and performance improvement of low-carbon cementitious material systems.

Key words: aluminum phase, ettringite, growth regulation, synthesis temperature, stability, crystal size

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