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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (6): 1947-1958.DOI: 10.16552/j.cnki.issn1001-1625.2025.1128

• 水泥混凝土 • 上一篇    下一篇

纳米钙矾石对超硫酸盐水泥基泡沫混凝土性能的影响

赵辉(), 晏伟(), 贾少朕, 刘亚坤, 汪雷, 孟江, 王军, 张淼   

  1. 湖北省电力规划设计研究院有限公司,武汉 430000
  • 收稿日期:2025-11-17 修订日期:2026-01-04 出版日期:2026-06-15 发布日期:2026-07-14
  • 通信作者: 晏伟,高级工程师。E-mail:yanw87-huby@powerchina.cn
  • 作者简介:赵辉(1986—),男,高级工程师。主要从事低碳建筑保温材料的研究。E-mail:zhaohui@powerchina-hb.com
  • 基金资助:
    低碳智慧建筑/园区关键技术研究(HBGC-KJ2-2024-02)

Effect of Nano AFt on Properties of Supersulfated Cement-Based Foam Concrete

ZHAO Hui(), YAN Wei(), JIA Shaozhen, LIU Yakun, WANG Lei, MENG Jiang, WANG Jun, ZHANG Miao   

  1. Power china Hubei Electric Engineering Co.,Ltd.,Wuhan 430000,China
  • Received:2025-11-17 Revised:2026-01-04 Published:2026-06-15 Online:2026-07-14

摘要:

超硫酸盐水泥基泡沫混凝土(SSC-FC)因碳排放量少和成本较低,在建筑节能领域具有广阔的应用前景。然而,SSC-FC早期水化缓慢,水化产物生成不足,导致孔壁致密性差,力学性能与抗碳化能力不足,这些问题严重限制了SSC-FC的工程化应用。本研究利用纳米钙矾石(nano AFt)的晶核诱导效应强化SSC-FC的孔壁结构,系统分析了nano AFt掺量对SSC-FC力学性能及抗碳化性能的影响规律,并采用水化热、XRD、SEM等方法揭示了nano AFt对SSC-FC水化历程、物相组成及孔隙结构演变的作用机制。结果表明:nano AFt的掺入加速了早期水化反应,促进了AFt在孔壁界面处生成,这一过程使孔壁结构更加致密。当nano AFt掺量为8%(质量分数)时,SSC-FC的7 d抗压强度由1.26 MPa提高至2.08 MPa,28 d抗压强度由2.37 MPa提高至3.61 MPa。此外,nano AFt能够细化孔径分布,降低孔隙配位数,减少连通孔的数量,从而有效限制了CO2的传输。在1 d加速碳化条件下,掺加8% nano AFt的样品仍保留25 mm的未碳化区域,碳化系数由0.88提高至0.92。

关键词: 超硫酸盐水泥, 纳米钙矾石, 泡沫混凝土, 孔结构, 孔壁, 抗碳化性能

Abstract:

Supersulfated cement-based foamed concrete (SSC-FC) has broad application potential in the field of building energy conservation due to its lower carbon emissions and cost. However, its slow early hydration and insufficient formation of hydration products of SSC-FC result in poor pore-wall compactness, leading to inadequate mechanical properties and carbonation resistance, which significantly limit its engineering applications. In this study, nano ettringite (nano AFt) was incorporated to enhance the pore-wall structure of SSC-FC through its nucleation-induced effect. The influence of nano AFt content on the mechanical properties and carbonation resistance of SSC-FC was systematically investigated, and the mechanisms on hydration process, phase composition, and pore-structure evolution were analyzed using isothermal calorimetry, XRD, SEM. The results show that the incorporation of nano AFt accelerates early hydration and promotes the formation of AFt at the pore-wall interface, leading to a denser pore-wall structure. When the nano AFt content reaches 8%(mass fraction), the 7 d compressive strength of SSC-FC increases from 1.26 MPa to 2.08 MPa, and the 28 d compressive strength increases from 2.37 MPa to 3.61 MPa. In addition, nano AFt refines the pore size distribution, reduces the pore coordination number, and decreases the number of connected pores, thereby restricting CO2 transport. Under 1 d accelerated carbonation conditions, the sample with 8% nano AFt retains an uncarbonated region of 25 mm, and its carbonation coefficient increases from 0.88 to 0.92.

Key words: supersulfated cement, nano AFt, foam concrete, pore structure, pore wall, carbonation resistance

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