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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (6): 2181-2190.DOI: 10.16552/j.cnki.issn1001-1625.2025.1117

• 道路材料 • 上一篇    下一篇

芦苇纤维增强流态粉煤灰的力学性能及微观结构分析

肖庆一1(), 张紫腾1, 马明晓2, 荆文龙3, 李子祎4   

  1. 1.河北工业大学土木与交通学院,天津 300401
    2.沧州路桥建设集团有限公司,沧州 061099
    3.瑞科同创电力工程设计有限公司济南分公司,济南 250014
    4.中建路桥勘察设计研究院,石家庄 050011
  • 收稿日期:2025-11-13 修订日期:2025-12-05 出版日期:2026-06-15 发布日期:2026-07-14
  • 作者简介:肖庆一(1979—),男,博士,教授。主要从事路面工程材料方面的研究。E-mail:q.y.xiao@foxmail.com
  • 基金资助:
    国家自然科学基金(50908072)

Mechanical Properties and Microstructure Analysis of Reed Fiber-Reinforced Fluid Fly Ash

XIAO Qingyi1(), ZHANG Ziteng1, MA Mingxiao2, JING Wenlong3, LI Ziyi4   

  1. 1.School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China
    2.Cangzhou Road and Bridge Construction Group Co.,Ltd.,Cangzhou 061099,China
    3.Ruike Tongchuang Power Engineering Design Co.,Ltd.,Jinan Branch,Jinan 250014,China
    4.Zhongjian Road and Bridge Survey and Design Institute,Shijiazhuang 050011,China
  • Received:2025-11-13 Revised:2025-12-05 Published:2026-06-15 Online:2026-07-14

摘要:

为解决软土地区桥涵台背回填中流态粉煤灰材料因沉降收缩和干燥收缩引起的开裂问题,本文通过在流态粉煤灰中掺入0.2%~1.0%(质量分数)的碱处理芦苇纤维,研究芦苇纤维增强流态粉煤灰轻型路基填料的力学性能,并结合扫描电子显微镜分析了材料的微观结构演化机理。结果表明,芦苇纤维最佳掺量为0.4%,相比于未掺芦苇纤维的对照组,此掺量下的复合材料90 d干缩值降低25.8%,180 d抗压强度提高12.8%,90 d劈裂抗拉强度提高21.2%;28与90 d水稳定系数分别提升至0.938和0.969,90 d冻融循环稳定系数达0.941;当芦苇纤维掺量超过0.6%后,复合材料的整体性能下降。微观结构分析显示,芦苇纤维在养护后期与基体形成致密的凝胶桥接结构,有效提高了材料的抗裂性、强度与长期耐久性。

关键词: 流态粉煤灰, 芦苇纤维, 道路工程, 配合比设计, 力学性能, 微观结构分析

Abstract:

In order to address the cracking problem caused by settlement and drying shrinkage of fluid fly ash materials used in the backfill of bridge and culvert abutments in soft soil areas, this paper investigated the mechanical properties of a reed fiber-reinforced fluid fly ash lightweight subgrade filler. Alkali-treated reed fibers with different content (0.2%~1.0%, mass fraction) were added into fluid fly ash, and the microstructural evolution mechanism of the material was analyzed using scanning electron microscopy. The results show that the optimum reed fiber content is 0.4%. Compared with the control group without reed fiber, the 90 d shrinkage value decreases by 25.8%, the 180 d compressive strength increases by 12.8%, and the 90 d splitting tensile strength increases by 21.2%. The water stability coefficients at 28 and 90 d increase to 0.938 and 0.969, respectively, and the 90 d freeze-thaw stability coefficient reaches 0.941. When the reed fiber content exceeds 0.6%, the overall performance of the composite material decreases. Microstructure analysis shows that the reed fibers form a dense gel-bridge structure with the matrix at the later curing stage, which enhances the crack resistance, strength, and long-term durability of the material.

Key words: fluid fly ash, reed fiber, road engineering, mix proportion design, mechanical property, microstructure analysis

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