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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (7): 2419-2427.DOI: 10.16552/j.cnki.issn1001-1625.2026.0110

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硅灰-粉煤灰复掺对混凝土强度演化与抗渗性能的影响机理

肖伟1(), 李一航2, 王栋琦1, 钟祖良2(), 周仁1, 朱开新2   

  1. 1.中交城市建设(四川)有限公司,成都 611130
    2.重庆大学土木工程学院,重庆 400041
  • 收稿日期:2026-01-30 修订日期:2026-02-15 出版日期:2026-07-15 发布日期:2026-08-13
  • 通信作者: 钟祖良,博士,教授。E-mail: haiou983@cqu.edu.cn
  • 作者简介:肖伟(1994—),男。主要从事道桥及隧道方面的研究。E-mail:1035872634@qq.com
  • 基金资助:
    重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0887)

Influence Mechanism of Silica Fume-Fly Ash Co-Doping on Strength Evolution and Impermeability of Concrete

XIAO Wei1(), LI Yihang2, WANG Dongqi1, ZHONG Zuliang2(), ZHOU Ren1, ZHU Kaixin2   

  1. 1.Zhongjiao Urban Construction (Sichuan) Co.,Ltd.,Chengdu 611130,China
    2.School of Civil Engineering,Chongqing University,Chongqing 400041,China
  • Received:2026-01-30 Revised:2026-02-15 Published:2026-07-15 Online:2026-08-13

摘要:

为促进硅灰与粉煤灰等工业固废在建材领域的高效利用,推动混凝土材料的绿色低碳发展,本文采用坍落度、扩展度、单轴抗压强度、抗渗试验及SEM-EDS微观分析方法,对四组不同掺合料体系混凝土进行了系统研究,包括基准组JZ(C30混凝土)、单掺硅灰组D1(8%(质量分数)硅灰)及复掺组D2(8%硅灰+10%(质量分数)粉煤灰)和D3(8%硅灰+20%粉煤灰)。结果表明:D1组的单轴抗压强度在1、3 d龄期均最高,其中3 d单轴抗压强度达17.9 MPa,较JZ组的15.6 MPa提高约15%;D2组的28 d单轴抗压强度为38.6 MPa,相较于其他组最高,且渗水高度最低,表现出最佳综合性能;D3组工作性能虽优于D2组,但单轴抗压强度与抗渗性能均弱于D2组。硅灰与粉煤灰复掺促进了二次水化反应,有利于水化产物的进一步生成与基体致密化。总体来看,硅灰主导早期结构致密化与单轴抗压强度形成,而粉煤灰主要通过后期重构孔结构与阻断渗透通道提升混凝土耐久性能,二者复掺可实现力学性能与抗渗性能的协同提升。

关键词: 粉煤灰, 硅灰, 早期强度, 力学性能, 抗渗性能, 微观分析

Abstract:

In order to promote the efficient utilization of industrial solid waste such as silica fume and fly ash in the field of building materials and promote the green and low-carbon development of concrete materials, this paper used slump, slump flow, uniaxial compressive strength, impermeability test and SEM-EDS microscopic analysis method. Four groups of concrete with different admixture systems were systematically studied, including the reference group JZ (C30 concrete), the single-doping silica fume group D1 (8% (mass fraction) silica fume) and the composite group D2 (8% silica fume+10% (mass fraction) fly ash) and D3 (8% silica fume+20% fly ash). The results show that the D1 group exhibits the highest uniaxial compressive strength at both 1 and 3 d. In particular, its 3 d uniaxial compressive strength reaches 17.9 MPa, representing an increase of approximately 15% compared with 15.6 MPa for JZ group. The D2 group achieves the highest 28 d uniaxial compressive strength, at 38.6 MPa, and also has the lowest water penetration height, indicating the best overall performance. Although the D3 group workability is superior to the D2 group, its uniaxial compressive strength and impermeability are both inferior to those of the D2 group. The co-doping of silica fume and fly ash promotes the secondary hydration reaction, which is conducive to the further formation of hydration products and the densification of matrix. In general, silica fume dominates the early structural densification and uniaxial compressive strength formation, while fly ash improves the durability of concrete mainly through the reconstruction of pore structure and the blocking of infiltration channel in the later stage. The synergistic improvement of mechanical properties and impermeability can be achieved by the combination of silica fume and fly ash.

Key words: fly ash, silica fume, early strength, mechanical property, impermeability, microscopic analysis

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