Effect of fiber section shape and volume fraction on the mechanical properties of steel-fiber reinforced concretes

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-11-03 DOI:10.3989/mc.2023.350223

Wei He, Shoujun Wu, Bo Zhang, Yanyu Liu, Yiming Luo, Guo Fu

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Abstract

This study presents the preparation of steel-fiber reinforced concretes (SFRCs) using straight navicular fibers with annular-sector-shaped sections and corrugated fiber with rectangular-shaped sections, respectively. The flexural and splitting tensile strengths of both the respective SFRCs increase with increasing fiber volume fraction, whereas their compressive strengths initially increase, then decrease, and then increase again. For the same fiber volume fraction, the mechanical properties of the navicular fiber-reinforced concrete are superior to those of the corrugated fiber-reinforced concretes. The introduction of steel fiber changes the failure mode of the plain concrete during bending from a typical brittle mode to a bimodal ductile failure mode. As compared to the corrugated fiber, the navicular fiber has stronger interface bonding to concrete and a higher friction resistance to fiber sliding and subsequent pullout. Furthermore, navicular fiber has a higher load-bearing capacity, which makes it more favorable for improving the mechanical properties of plain concrete.

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纤维截面形状和体积分数对钢纤维混凝土力学性能的影响

本研究分别采用环形扇形截面的直舟状纤维和矩形截面的波纹状纤维制备钢纤维混凝土(SFRCs)。随着纤维体积分数的增加，两种纤维的抗折强度和劈裂抗拉强度均增加，抗压强度先增加后降低，再增加。相同纤维体积分数下，舟形纤维增强混凝土的力学性能优于波纹状纤维增强混凝土。钢纤维的引入使素混凝土在弯曲过程中由典型的脆性破坏模式转变为双峰延性破坏模式。与波纹纤维相比，舟形纤维与混凝土的界面结合更强，对纤维滑动和随后的拉拔具有更高的摩擦阻力。此外，舟形纤维具有较高的承载能力，更有利于改善素混凝土的力学性能。

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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.