一种新型弧形钢纤维增强浆渗纤维混凝土的抗压性能

IF 3.3 3区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Journal of Zhejiang University-SCIENCE A Pub Date : 2023-05-17 DOI:10.1631/jzus.A2200405
Hedong Li, Yabiao Li, Yunfeng Pan, NG P.L., C. Leung, Xin Zhao
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引用次数: 0

摘要

浆液浸润纤维混凝土(SIFCON)是一种应变硬化水泥基复合材料,通常由5%-20%的钢纤维制成。本文研究了一种新型的以弧形钢纤维代替钩端钢纤维的SIFCON。首先测试了SIFCON的准静态压缩性能。试验结果表明,用弧形钢纤维代替钩端钢纤维,准静态抗压强度提高47.1%,峰值应力应变提高56.3%。我们将这些改进归功于引入弧形钢纤维的新型抗裂机制,即“纤维交叉锁”、“双桥接”和“约束环”。高抗冲击性能是SIFCON具有实际意义的特殊性能,采用直径80 mm的分离式霍普金森压杆(SHPB)对弧形钢纤维SIFCON的动态压缩性能进行了研究。结果表明:SIFCON的动态抗压强度、动态增加因子(DIF)和动态韧性均随应变速率的增大而增大;事实证明,含有弧形钢纤维的SIFCON在需要高抗冲击性的结构应用中具有显著的优势。
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Compressive properties of a novel slurry-infiltrated fiber concrete reinforced with arc-shaped steel fibers
Slurry-infiltrated fiber concrete (SIFCON) is a sort of strain hardening cement-based composite material, typically made with 5%–20% steel fibers. This study focused on a novel type of SIFCON in which hooked-end steel fibers were replaced by arc-shaped steel fibers. The quasi-static compressive properties of the SIFCON were first measured. Test results suggested that using arc-shaped steel fibers in lieu of hooked-end steel fibers increased the quasi-static compressive strength by 47.1% and the strain at peak stress by 56.3%. We attribute these improvements to new crack-resisting mechanisms, namely “fiber cross-lock”, “dual bridging”, and “confinement loops”, when the arc-shaped steel fibers are introduced into SIFCON. As high impact resistance is a special property of SIFCON that is of practical significance, the dynamic compressive properties of arc-shaped steel fiber SIFCON were studied by using an 80-mm-diameter split Hopkinson pressure bar (SHPB). The results showed that the dynamic compressive strength, dynamic increase factor (DIF), and dynamic toughness of SIFCON all increased with the strain rate. The SIFCON incorporating arc-shaped steel fibers proved to have significant advantages in structural applications requiring high impact resistance.
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来源期刊
Journal of Zhejiang University-SCIENCE A
Journal of Zhejiang University-SCIENCE A 工程技术-工程:综合
CiteScore
5.60
自引率
12.50%
发文量
2964
审稿时长
2.9 months
期刊介绍: Journal of Zhejiang University SCIENCE A covers research in Applied Physics, Mechanical and Civil Engineering, Environmental Science and Energy, Materials Science and Chemical Engineering, etc.
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