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【目的】研究纳米SiO2和混杂纤维增强环氧树脂水泥基修复材料(NF-ECRM)抗压强度的变化规律，揭示环氧树脂乳液、纳米SiO2和聚乙烯醇(PVA)-钢混杂纤维对抗压强度的影响机理。【方法】通过立方体抗压强度试验分析了环氧树脂、纳米SiO2和PVA-钢混杂纤维的掺量对NF-ECRM抗压强度的影响规律；通过扫描电子显微镜试验研究，揭示NF-ECRM抗压强度的增强机理。【结果】随着环氧树脂掺量的增加，环氧树脂水泥基修复材料和NF-ECRM的抗压强度均呈下降趋势；NF-ECRM的抗压强度随着纳米SiO2掺量的增加呈逐渐上升的趋势，随着PVA纤维掺量的增加呈先增大后减小的趋势，且在PVA纤维掺量增加至0.9%时达到峰值。【结论】环氧树脂可有效缓解水泥基修复材料基体内应力，抑制微裂纹的产生和扩展；纳米SiO2可减少水泥基修复材料基体孔洞缺陷，提高界面过渡区的致密性；PVA-钢混杂纤维可显著提高水泥基修复材料基体的整体性和抗裂性。
Abstract：【Objective】 This study aims to investigate the variation in compressive strength of nano-SiO2 and hybrid fiber-reinforced epoxy resin cementitious repair materials(NF-ECRM), and to reveal the influence mechanism of epoxy resin emulsion, nano-SiO2 and polyvinyl alcohol(PVA)-steel hybrid fiber on the compressive strength. 【Methods】 Cube compressive strength tests were conducted to analyze the effects of the contents of epoxy resin, nano-SiO2, and PVA-steel hybrid fibers on the compressive strength of NF-ECRM. Scanning electron microscope tests were performed to reveal the strengthening mechanism of the compressive strength of NF-ECRM. 【Results】 With the increase in epoxy resin content, the compressive strength of epoxy resin cementitious repair materials(ECRM) and NF-ECRM both showed a decreasing trend. Meanwhile, the compressive strength of NF-ECRM gradually increased with the increase in nano-SiO2 content, while it first increased and then decreased with the increase in PVA fiber content, reaching the peak when the PVA fiber content was 0.9%. 【Conclusion】 Epoxy resin can effectively relieve internal stress in the cementitious repair material matrix and inhibit the formation and expansion of micro-cracks. Nano-SiO2 can reduce pore defects of the cementitious repair material matrix and improve the compactness of the interfacial transition zone. Moreover, PVA-steel hybrid fiber can significantly enhance the integrity and crack resistance of the cementitious repair material matrix.
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基本信息:
DOI：10.19760/j.ncwu.zk.2026028
中图分类号:TV431.3
引用信息:
[1]吴靖江,张鹏,尉晓雪,等.纳米SiO_2和混杂纤维增强环氧树脂水泥基修复材料抗压强度研究[J].华北水利水电大学学报(自然科学版),2026,47(02):103-110.DOI:10.19760/j.ncwu.zk.2026028.
基金信息:
国家自然科学基金项目(52278283); 河南省杰出青年科学基金项目(212300410018)
2024-12-31
2024-12-31
2024-12-31