Research on Flexural Properties and Flexural Toughness Evaluation Method of Steel Fiber Reinforced Cementitious Composites under Polar Low Temperatures

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-02-29 DOI:10.1155/2024/1137438

Farun Shui, Jun Su, Junjie Huang, Yang Li, Weimin Qian

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引用次数: 0

Abstract

In this research, five groups of steel fiber reinforced cementitious composite (SFRCC) with different fiber volume content (0%, 0.5%, 1.0% 1.5%, and 2.0%) were designed to perform four-point flexural tests on beam specimens to study the effects of polar temperature (20, 0, −25, −50, −75, and −100°C) and fiber volume content on the flexural properties. The flexural toughness index and load holding capacity index were calculated based on the load–displacement curve, and the enhancement and toughening mechanisms of SFRCC by low temperature and steel fibers were analyzed in conjunction with experimental observations. The results of the proposed flexural toughness evaluation method show that the flexural toughness of SFRCC can significantly improve than that of ambient temperature when the temperature is lower than 0°C. With the decrease in temperature, the flexural property of SFRCC increases first and then decreases, and the temperature point of this transition is around −50–−75°C. The flexural property enhancement effect of 1.0% fiber volume content SFRCC is more significant in low temperatures according to the flexural toughness index and load holding capacity index. The conclusion can provide a reference for the application of SFRCC in cryogenic engineering, as well as a simple and quantifier evaluation method for flexural toughness is proposed.

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极地低温条件下钢纤维增强水泥基复合材料的挠曲性能和挠曲韧性评价方法研究

本研究设计了五组不同纤维体积含量（0%、0.5%、1.0%、1.5%和2.0%）的钢纤维增强水泥基复合材料（SFRCC），对梁试件进行四点弯曲试验，研究极点温度（20、0、-25、-50、-75和-100℃）和纤维体积含量对弯曲性能的影响。根据荷载-位移曲线计算了抗弯韧性指数和承载能力指数，并结合实验观察分析了低温和钢纤维对 SFRCC 的增强和增韧机理。所提出的挠曲韧性评价方法的结果表明，当温度低于 0°C 时，SFRCC 的挠曲韧性比常温下有明显提高。随着温度的降低，SFRCC 的抗弯性能先升高后降低，这一转变的温度点在 -50-75°C 左右。从抗弯韧性指数和承载能力指数来看，纤维体积含量为 1.0% 的 SFRCC 在低温下的抗弯性能增强效果更为显著。该结论可为 SFRCC 在低温工程中的应用提供参考，同时也提出了一种简单量化的抗弯韧性评价方法。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.