The Influence of UHPFRC Jacket Steel Fiber Content on Strengthening Damaged Columns

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-10-13 DOI:10.48084/etasr.6292

Hasan A. Alasmari

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Abstract

Steel fiber is a commonly used material to repair damaged concrete, caused by environmental or design issues. This study used various Micro-copper-coated Steel Fiber (MSF) content (0.0, 0.5, 2.0, and 2.5%) with varying aspect ratios (28, 37, and 45) as part of Ultra-High-Performance Fiber-Reinforced Concrete (UHPFRC) mixtures to repair damaged concrete columns using a 30 mm layer jacketing. Twelve columns were prepared and tested at first by loading them with roughly 90% of their ultimate axial load capacity. Damage was caused and the columns were subsequently strengthened and rebuilt using UHPFRC mixtures in 30-mm layer jacketing for a second test, to determine the effect of UHPFRC and MSF content on damaged and reinforced columns. The test results showed that the concrete properties improved as the MSF content increased to 2.0% of the volume fraction, beyond which there was a slight reduction. Additionally, the UHPFRC-strengthened columns with and without MSFs experienced higher load capacities than the corresponding unstrengthened. On the contrary, using 2.5% MSF in the UHPFRC decreased the loading capacity by 14% compared to the UHPFRC with 2.0% MSF. The strengthened column with 2.0% MSF content showed the highest load efficiency (165.7% compared to unstrengthened), along with substantial displacement and ductility.

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UHPFRC护套钢纤维含量对损伤柱加固的影响

钢纤维是修复因环境或设计问题而损坏的混凝土的常用材料。本研究使用不同的微铜涂层钢纤维(MSF)含量(0.0、0.5、2.0和2.5%)和不同的宽高比(28、37和45)作为超高性能纤维增强混凝土(UHPFRC)混合物的一部分，使用30毫米层护套修复受损的混凝土柱。12个柱被准备和测试，首先通过加载他们大约90%的极限轴向载荷能力。在第二次试验中，在30mm层护套中使用UHPFRC混合物对柱进行加固和重建，以确定UHPFRC和MSF含量对受损和加固柱的影响。试验结果表明，当MSF含量增加到体积分数的2.0%时，混凝土性能有所改善，超过该分数后，混凝土性能略有下降。此外，有和没有msf的uhpfrc加固柱比相应的未加固柱具有更高的承载能力。相反，与使用2.0% MSF的UHPFRC相比，在UHPFRC中使用2.5% MSF的承载能力降低了14%。当MSF含量为2.0%时，加固柱的荷载效率最高(比未加固柱高165.7%)，且具有较大的位移和延性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.