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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (1): 177-190.DOI: 10.16552/j.cnki.issn1001-1625.2025.0670

• 资源综合利用 • 上一篇    下一篇

含氟复合激发剂对钢渣基蓄热水泥水化产物及性能的影响

周烨来(), 马慧博, 张世栋, 赵祥麟, 朱纯, 孔海涛, 李宝让()   

  1. 华北电力大学能源动力与机械工程学院,北京 102206
  • 收稿日期:2025-07-09 修订日期:2025-08-15 出版日期:2026-01-20 发布日期:2026-02-10
  • 通信作者: 李宝让,博士,教授。E-mail:libr@ncepu.edu.cn
  • 作者简介:周烨来(2001—),男,硕士研究生。主要从事钢渣基固废材料的研究。E-mail:1327871935@qq.com
  • 基金资助:
    江苏省碳达峰碳中和科技创新专项资金项目(BE2022028-4)

Effect of Fluorine-Containing Composite Activator on Hydration Products and Properties of Steel Slag-Based Thermal Storage Cement

ZHOU Yelai(), MA Huibo, ZHANG Shidong, ZHAO Xianglin, ZHU Chun, KONG Haitao, LI Baorang()   

  1. School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China
  • Received:2025-07-09 Revised:2025-08-15 Published:2026-01-20 Online:2026-02-10

摘要:

本文针对钢渣(SS)基蓄热水泥,设计了一种含氟复合激发剂(Na2SiO3·9H2O/Na2SO4/K2SO4/KF),并将其分别应用于钢渣-硅酸盐水泥(PC)、钢渣-铝酸盐水泥(CAC)和钢渣-硫铝酸盐水泥(CSA)三种胶凝体系的活化研究。通过调控激发剂的掺量,系统考察其对材料抗压强度、热导率及比热容的影响,并结合XRD、TG-DTG及SEM等手段分析作用机理。结果表明,激发剂提供的碱性环境能有效促进钢渣-水泥体系中矿物相的解聚,而F-的引入抑制了钙矾石(AFt)与水化铝酸钙的生成。在该激发剂的复合作用下,解聚形成的[Al(OH)4-与[H2SiO42-更倾向于生成富铝的水化硅铝酸钙(C-A-S-H)凝胶,过量的[Al(OH)4-最终转化为Al(OH)3。这些更致密的水化产物显著改善了浆体的力学性能与热物理性能,使三种体系的综合性能达到甚至优于纯水泥浆体的水平。其中,钢渣-硅酸盐水泥和钢渣-铝酸盐水泥体系在3%(质量分数)激发剂掺量时表现出较好的综合性能;而激发剂过量可能引发Al(OH)3与F-反应,抑制钢渣-铝酸盐水泥浆体的强度发展。本研究揭示了含氟复合激发剂在钢渣基蓄热水泥中的作用机制,为钢渣资源化利用及高性能蓄热水泥的设计提供了参考。

关键词: 混凝土, 钢渣, 复合胶凝材料, 复合激发剂, 水化, 显热储热

Abstract:

In this study, a fluoride-containing composite activator (Na2SiO3·9H2O/Na2SO4/K2SO4/KF) was designed for steel slag (SS)-based thermal storage cement and applied to three cementitious systems: SS-Portland cement (PC), SS-calcium aluminate cement (CAC), and SS-calcium sulphoaluminate cement (CSA). The effect of activator dosage on compressive strength, thermal conductivity, and specific heat capacity was systematically evaluated, and the underlying activation mechanisms were investigated using XRD, TG-DTG, and SEM analyses. The results demonstrate that the alkaline environment generated by the activator effectively promotes the depolymerization of mineral phases in the steel slag-cement system, whereas the incorporation of F- suppresses the formation of ettringite (AFt) and calcium aluminate hydrates. Under the combined action of the activator, the depolymerized [Al(OH)4- and [H2SiO42- tend to form aluminum-rich calcium silicoaluminate hydrate (C-A-S-H) gel. The excess [Al(OH)4- is eventually converted into Al(OH)3. The formation of denser hydration products significantly enhances the mechanical and thermophysical properties of the paste, enabling all three systems to achieve or surpass the performance of pure cement paste. Among them, SS-PC and SS-CAC systems exhibit optimal overall performance at a 3% (mass fraction) activator dosage. However, excessive activator leads to reactions between Al(OH)3 and F-, hindering the strength development of the SS-CAC system. This study not only elucidates the mechanism of the fluoride-containing composite activator in SS-based thermal storage cement, but also provides a reference for the resource utilization of SS and the design of high-performance thermal storage cement.

Key words: concrete, steel slag, composite cementitious material, composite activator, hydration, sensible heat storage

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