多尺度碳纤维改性混凝土的力学性能及抗冻性

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (11): 4004-4011.

多尺度碳纤维改性混凝土的力学性能及抗冻性

方莹^1,2, 文祝²

1.哈尔滨工业大学建筑与环境学院,哈尔滨 150006;
2.宜宾职业技术学院建筑与环境学院,宜宾 644003

收稿日期:2024-04-19 修订日期:2024-06-06 出版日期:2024-11-15 发布日期:2024-11-21
作者简介:方莹(1987—),女,讲师。主要从事建筑工程材料与施工的研究。E-mail:fangying1983@163.com
基金资助:
四川省电教化管项目(KT202009303CE8053);宜宾职业技术学院院级科研项目(ZRKY21ZDXM-02,YBZY20CXTD02)

Mechanical Properties and Frost Resistance of Multi-Scale Carbon Fiber Modified Concrete

FANG Ying^1,2, WEN Zhu²

1. School of Architecture and Environment, Harbin Institute of Technology, Harbin 150006, China;
2. School of Architecture and Environment, Yibin Vocational and Technical College, Yibin 644003, China

Received:2024-04-19 Revised:2024-06-06 Published:2024-11-15 Online:2024-11-21

摘要/Abstract

摘要： 本文将微米级碳纤维(CFs)和纳米级纳米碳纤维(CNFs)掺入混凝土中,制备了一种纳米碳纤维改性混凝土(CNFsMC,CNFs体积掺量为0.3%)和四种多尺度碳纤维改性混凝土(MCFsMC,CNFs体积掺量固定为0.3%,CFs体积掺量分别为0.05%、0.10%、0.15%、0.20%),研究了多尺度碳纤维对混凝土力学性能及抗冻性的影响,并分析了多尺度碳纤维对混凝土的改性机理。结果表明:在掺加0.3%CNFs的基础上,掺加适量的CFs可进一步提高混凝土的力学性能和抗冻性。当CFs掺量为0.10%时,MCFsMC的力学性能和抗冻性最佳,冻融循环前、后的总孔隙率和平均孔径最小,其抗压强度、抗折强度、折压比、劈裂抗拉强度分别较CNFsMC增大了13.93%、25.08%、9.83%、20.15%,冻融循环200次后其质量损失率仅为0.95%,相对动弹性模量达89.2%,强度损失率均小于14%。CNFs和CFs具有正混杂效应,两者可以优势互补,构建多尺度阻裂网络,对不同尺寸的裂缝有效发挥作用,对混凝土的力学性能和抗冻性起到双重增强的效果。

关键词: 混凝土, 纳米碳纤维, 碳纤维, 多尺度, 力学性能, 抗冻性

Abstract: Carbon nanofibers (CNFs) and carbon fibers (CFs) are nanoscale and micrometer carbon-based fibers, respectively. By mixing them into concrete, one kind of carbon nanofibers modified concrete (CNFsMC, the volume content of CNFs is 0.3%) and four kinds of multi-scale carbon fibers modified concrete (MCFsMC, the volume content of CNFs is fixed at 0.3%, and the volume content of CFs is 0.05%, 0.10%, 0.15%, 0.20%, respectively). The effect of multi-scale carbon-based fibers on mechanical properties and frost resistance of concrete were studied, and the modification mechanism of multi-scale carbon-based fibers on concrete was analyzed. The results show that the mechanical properties and frost resistance of concrete can be further improved by adding appropriate content of CFs on the basis of 0.3% CNFs. When the content of CFs is 0.1%, the mechanical properties and frost resistance of MCFsMC are the best, and the total porosity and average pore size before and after freeze-thaw cycle are the minimum. And the compressive strength, flexural strength, flexural-compressive strength ratio and splitting tensile strength of MCFsMC increase by 13.93%, 25.08%, 9.83% and 20.15%, respectively, compared with CNFsMC. After 200 freeze-thaw cycles, the mass loss rate of MCFsMC is only 0.95%, the relative dynamic elastic modulus is 89.2%, and the strength loss rate is less than 14%. CNFs and CFs have positive hybrid effect, and they can complement each other, construct multi-scale crack resistance network and effectively play an effect on cracks with different sizes, and double enhance the mechanical properties and frost resistance of concrete.

Key words: concrete, carbon nanofiber, carbon fiber, multi-scale, mechanical property, frost resistance

中图分类号:

TU528

方莹, 文祝. 多尺度碳纤维改性混凝土的力学性能及抗冻性[J]. 硅酸盐通报, 2024, 43(11): 4004-4011.

FANG Ying, WEN Zhu. Mechanical Properties and Frost Resistance of Multi-Scale Carbon Fiber Modified Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4004-4011.

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