纳米SiO2和混杂纤维增强环氧树脂水泥基修复材料的抗折性能和微观结构

摘要/Abstract

摘要： 水泥基材料因强度高、易于施工而被广泛应用于土木工程,但脆性较大、抗折性能差的缺点也限制了其在有高抗折要求条件下的应用。为提高其抗折强度,环氧树脂乳液、纳米SiO₂和聚乙烯醇(PVA)-钢混杂纤维被掺入水泥基材料。为研究环氧树脂乳液、纳米SiO₂和PVA-钢混杂纤维对水泥基修复材料抗折性能和微观结构的影响,通过抗折强度试验和扫描电子显微镜测试,分别测得了水泥基修复材料的抗折强度和观察了其微观结构。结果表明,随着环氧树脂乳液掺量从0%增加到12%(质量分数),水泥基修复材料的抗折强度呈先上升后下降的趋势,最大抗折强度可达7.44 MPa。纳米SiO₂和PVA-钢混杂纤维均能够提升水泥基修复材料的抗折强度超过45%,其中钢纤维对抗折强度的提高效果更显著。掺加环氧树脂乳液和纳米SiO₂能够明显提高基体内部结构的致密性,从而改善水泥基修复材料的抗折性能。此外,聚合物可以附着于掺入纤维的表面,改善纤维与基体间的黏结作用。本研究将为水泥基材料在高抗折工况下的应用提供参考。

关键词: 水泥基修复材料, 环氧树脂, 纳米SiO₂, 混杂纤维, 抗折性能, 微观结构

Abstract: Cement-based materials are widely used in civil engineering because of high strength and easy construction, but the shortcomings of brittleness and poor flexural properties also limit their application under the condition of high bending resistance. In order to improve the flexural strength, epoxy resin emulsion, nano-SiO₂ and polyvinyl alcohal (PVA)-steel hybrid fiber were added into cement-based materials. The flexural properties and microstructure of cement-based repair materials were studied by the effects of epoxy resin emulsion, nano-SiO₂ and PVA-steel hybrid fibers, which were measured by flexural strength test and scanning electron microscopy test, respectively. The results show that the flexural strength of cement-based repair materials increases first and then decreases with the increase of epoxy resin emulsion content from 0% to 12% (mass fraction), and the maximum flexural strength reaches 7.44 MPa. Both nano-SiO₂ and PVA-steel hybrid fiber can increase the flexural strength of cement-based repair materials by more than 45%, and steel fiber has a more significant effect on the flexural strength. The addition of epoxy resin emulsion and nano-SiO₂ can increase the internal structure density of the matrix greatly to improve the flexural strength of cement-based repair materials. In addition, the bond between the fiber and the matrix is improved for the polymer attached to the surface of the incorporated fiber. This study will provide reference for the application of cement-based repair materials under high bending resistance conditions.

Key words: cement-based repair material, epoxy resin, nano-SiO₂, hybrid fiber, flexural property, microstructure

中图分类号:

TU528.58

张鹏, 吴靖江, 张承实, 尉晓雪, 代小兵. 纳米SiO₂和混杂纤维增强环氧树脂水泥基修复材料的抗折性能和微观结构[J]. 硅酸盐通报, 2025, 44(3): 834-841.

ZHANG Peng, WU Jingjiang, ZHANG Chengshi, WEI Xiaoxue, DAI Xiaobing. Flexural Properties and Microstructure of Nano-SiO₂ and Hybrid Fiber Reinforced Epoxy Resin Cement-Based Repair Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 834-841.

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纳米SiO₂和混杂纤维增强环氧树脂水泥基修复材料的抗折性能和微观结构

Flexural Properties and Microstructure of Nano-SiO₂ and Hybrid Fiber Reinforced Epoxy Resin Cement-Based Repair Materials

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