欢迎访问《硅酸盐通报》官方网站,今天是

硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1626-1637.DOI: 10.16552/j.cnki.issn1001-1625.2025.0958

• 资源综合利用 • 上一篇    下一篇

纳米SiO2改性高炉矿渣-粉煤灰地质聚合物固化土力学性能

胡建林1,2(), 陶喜龙1, 李雅儒1, 贾天尧1, 吴春平3, 孟志鹏2(), 周永祥2   

  1. 1.河北建筑工程学院土木工程学院,张家口 075000
    2.北京工业大学桥梁工程安全与韧性全国重点实验室,北京 100124
    3.张家口市第十建筑工程有限公司,张家口 075000
  • 收稿日期:2025-09-28 修订日期:2026-01-04 出版日期:2026-05-15 发布日期:2026-06-10
  • 通信作者: 孟志鹏,博士研究生。E-mail:mengzp@emails.bjut.edu.cn
  • 作者简介:胡建林(1986—),男,博士,副教授。主要从事地质聚合物材料方面的研究。E-mail:1065644325@qq.com
  • 基金资助:
    国家自然科学基金面上项目(52378213);河北省高等学校科学技术研究项目资助(QN2024070)

Mechanical Properties of Nano-SiO2 Modified GGBS-Fly Ash Geopolymer-Stabilized Soil

HU Jianlin1,2(), TAO Xilong1, LI Yaru1, JIA Tianyao1, WU Chunping3, MENG Zhipeng2(), ZHOU Yongxiang2   

  1. 1.College of Civil Engineering,Hebei University of Architecture,Zhangjiakou 075000,China
    2.National Key Laboratory of Bridge Safety and Resilience,Beijing University of Technology,Beijing 100124,China
    3.Zhangjiakou 10th Construction Engineering Co.,Ltd.,Zhangjiakou 075000,China
  • Received:2025-09-28 Revised:2026-01-04 Published:2026-05-15 Online:2026-06-10

摘要:

为了解决水泥固化土耗能高、碳排放量大、前期强度低、水稳定性差等问题,本研究采用高炉矿渣和粉煤灰作为前驱体,水玻璃作为激发剂,制备地质聚合物,并添加纳米SiO2进行土体固化,通过无侧限抗压强度和水稳定性试验,结合扫描电子显微镜、能量色散光谱及氮气吸附等微观分析,探究了纳米SiO2掺量和养护龄期对地质聚合物固化土力学性能的影响。结果表明:随着纳米SiO2掺量的增加,地质聚合物固化土无侧限抗压强度呈先增加后降低的趋势,且纳米SiO2最优掺量为0.6%(质量分数),在高炉矿渣与粉煤灰质量比为5∶5、7∶3和9∶1时,无侧限抗压强度较未掺纳米SiO2试件分别提升了16.0%、22.4%和26.5%;高炉矿渣掺量越高,纳米SiO2对地质聚合物固化土无侧限抗压强度的提升效果越显著;随着养护龄期的增长,地质聚合物固化土无侧限抗压强度逐渐提升,但纳米SiO2对无侧限抗压强度的提升作用呈下降趋势,高炉矿渣与粉煤灰质量比为7∶3时,较未掺纳米SiO2的试件7、14和28 d的强度增长率分别为22.4%、15.4%和6.0%;掺入纳米SiO2可以提高试件的水稳定性并降低其强度损失率;微观分析发现纳米SiO2通过化学反应、颗粒填充和晶种成核作用提高了地质聚合物固化土的抗压强度和水稳定性;氮气吸附试验结果表明,随着纳米SiO2掺量的增加,试样的积分孔体积及大孔比例均呈先下降后上升的变化趋势,与力学性能变化趋势一致。

关键词: 高炉矿渣-粉煤灰地质聚合物, 纳米SiO2, 固化土, 无侧限抗压强度, 水稳定性, 微观分析

Abstract:

To address the issues of high energy consumption, significant carbon emissions, low early strength, and poor water stability in cement-stabilized soil, this study used ground granulated blast-furnace slag (GGBS) and fly ash as precursors, water glass as activator to prepare geopolymer, and added nano-SiO2 to solidify the soil. Through unconfined compressive strength tests and water stability tests, combined with microscopic analyses including scanning electron microscopy, energy-dispersive spectroscopy, and nitrogen adsorption, the effects of nano-SiO2 content and curing age on the mechanical properties of geopolymer-stabilized soil were investigated. The results indicate that the unconfined compressive strength of geopolymer-stabilized soil initially increases and then decreases with increasing nano-SiO2 content, with an optimal nano-SiO2 content of 0.6% (mass fraction). When the mass ratio of GGBS to fly ash is 5∶5, 7∶3, and 9∶1, the unconfined compressive strength is 16.0%, 22.4% and 26.5%, respectively, higher than that of the undoped nano-SiO2 specimen. The higher the content of GGBS is, the more significant the effect of nano-SiO2 on the unconfined compressive strength of geopolymer-solidified soil is. With the increase of curing age, the unconfined compressive strength of geopolymer-stabilized soil gradually increases, but the effect of nano-SiO2 on the unconfined compressive strength decreases. When the mass ratio of GGBS to fly ash is 7∶3, the strength growth rates at 7, 14, and 28 d for specimens with nano-SiO2 are 22.4%, 15.4%, and 6.0%, respectively, relative to those without nano-SiO2. The incorporation of nano-SiO2 improves the water stability and reduces the strength loss rate of the specimens. Microscopic analysis reveales that nano-SiO2 enhances the compressive strength and water stability of geopolymer-stabilized soil through chemical reactions, particle filling, and nucleation effects. Nitrogen adsorption test results show that with increasing nano-SiO2 content, the cumulative pore volume and the proportion of large pores in the specimens first decrease and then increase, which is consistent with the change of mechanical properties.

Key words: GGBS-fly ash geopolymer, nano-SiO2, stabilized soil, unconfined compressive strength, water stability, microscopic analysis

中图分类号: