非晶合金纤维和钢纤维单/混掺增强混凝土开裂及断裂性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2137-2148.

非晶合金纤维和钢纤维单/混掺增强混凝土开裂及断裂性能研究

乔险涛¹, 喻鹏², 陈喜健¹, 周佳乐², 张连杰¹, 李健朋³

1.中铁建(东莞)建设投资有限公司,东莞 523867;
2.东莞理工学院生态环境与建筑工程学院,东莞 523803;
3.中国矿业大学力学与土木工程学院,徐州 221018

收稿日期:2023-11-21 修订日期:2024-01-17 出版日期:2024-06-15 发布日期:2024-06-18
作者简介:乔险涛(1973—),男,高级工程师。主要从事城市轨道交通建设及相关的研究。E-mail:359458134@qq.com
基金资助:
国家自然科学基金(52008106);广东省基础与应用基础研究基金联合基金(粤莞)项目(2021A1515110075);中铁十五局集团有限公司企业委托课题(11001202301001);中铁隧道局企业委托课题(738012491,738012490)

Cracking Behavior and Fracture Toughness of Concrete Strengthened by Single/Mixed Amorphous Alloy Fiber and Steel Fiber

QIAO Xiantao¹, YU Peng², CHEN Xijian¹, ZHOU Jiale², ZHANG Lianjie¹, LI Jianpeng³

1. China Railway Construction (Dongguan) Investment Corporation Limited, Dongguan 523867, China;
2. School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523803, China;
3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221018, China

Received:2023-11-21 Revised:2024-01-17 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 为探索纤维混凝土抗裂性能,本文研究了不同类型纤维(平直型钢纤维、平直型非晶合金纤维、钢纤维+非晶合金纤维)和不同纤维体积掺量(1.0%,1.5%和2.0%)混凝土的早期开裂性能和硬化后的断裂性能。首先通过平板法试验并借助数字图像对混凝土的早期裂缝特征进行量化分析,评估了纤维混凝土的早期开裂性能;再通过带切口棱柱体试件的三点弯曲试验,基于双K断裂参数,分析并评估了混凝土硬化后的断裂性能。结果表明,钢纤维单掺和混掺纤维混凝土的早期抗裂性能最好;纤维掺量由1.0%增加至2.0%时,钢纤维、合金纤维和混掺纤维混凝土失稳韧度分别增加了58.9%、44.3%和55.5%,且掺量为2.0%的混掺混凝土断裂能是普通混凝土的11.8倍。钢纤维和非晶合金纤维可在混凝土硬化过程的不同时期发挥协同作用,两种纤维混掺不仅能阻止混凝土早期的塑性开裂,还可有效控制硬化后受拉裂缝的形成和发展,达到分阶段抗裂的目的。综合考虑混凝土的早期开裂性能、硬化后受拉性能以及断裂性能,体积掺量相同情况下混掺纤维混凝土整体性能更优。

关键词: 纤维混凝土, 非晶合金纤维, 钢纤维, 开裂性能, 断裂性能, 混掺效应

Abstract: To reveal cracking resistance of fiber reinforced concrete (FRC), an experimental investigation was conducted on concrete with various types of fibers (straight steel fiber, amorphous alloy straight fiber, and steel fiber+amorphous alloy fiber) and various volume fractions (1.0%, 1.5% and 2.0%) to evaluate early cracking behavior and post-hardened fracture toughness. First, the concrete early cracking feature was quantitatively analyzed by using plate method and image quantitative technique, aiming to evaluate early cracking behavior of FRC. Then, the three-point bending tests were conducted on notched prism specimens, the hardened fracture toughness of FRC was analyzed and assessed based on the double K fracture parameters. The results show that the single steel fiber reinforced concrete and hybrid fiber concrete exhibit the best cracking resistance at early age. As the fiber fraction increases from 1.0% to 2.0%, the unstable fracture toughness of steel fiber, amorphous alloy fiber, and hybrid fiber reinforced concrete increases by 58.9%, 44.3% and 55.5%, respectively. Meanwhile, the fracture energy of hybrid fiber concrete with 2.0% fiber reaches 11.8 times that of normal concrete. It shows that steel and amorphous alloy fibers have a synergistic effect at different periods of concrete hardening process. As a result, steel fiber and amorphous alloy fiber have a synergistic effect at the different periods of the hardening process, the hybrid steel and amorphous alloy fibers can not only prevent the early-age concrete plastic cracking but also effectively control the formulation and propagation of post-hardened tensile cracks, thus, achieving a staged anti-crack purpose. Considering the early cracking properties, post-hardening tensile properties, and fracture properties of concrete, the overall performance of hybrid fiber concrete with the same fiber content shows better performance.

Key words: fiber reinforced concrete, amorphous alloy fiber, steel fiber, cracking behavior, fracture toughness, hybrid effect

中图分类号:

TU528

乔险涛, 喻鹏, 陈喜健, 周佳乐, 张连杰, 李健朋. 非晶合金纤维和钢纤维单/混掺增强混凝土开裂及断裂性能研究[J]. 硅酸盐通报, 2024, 43(6): 2137-2148.

QIAO Xiantao, YU Peng, CHEN Xijian, ZHOU Jiale, ZHANG Lianjie, LI Jianpeng. Cracking Behavior and Fracture Toughness of Concrete Strengthened by Single/Mixed Amorphous Alloy Fiber and Steel Fiber[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2137-2148.

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