Tension Lap Splices in Recycled-Aggregate Concrete Strengthened with Steel–Polyolefin Fibers

IF 4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Fibers Pub Date : 2024-07-24 DOI:10.3390/fib12080060

Abdullah A. Al-Hussein, F. Majeed, Kadhim Z. Naser

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Abstract

The bond strength of tension lap splices in recycled-coarse-aggregate-reinforced concrete strengthened with hybrid (steel–polyolefin) fibers was experimentally investigated. This study was conducted with the help of twelve lap-spliced beam specimens. The replacement level of coarse natural aggregates with recycled concrete aggregate (RCA) was 100%. The following variables were investigated: various ranges of steel–polyolefin fibers—100–0%, 75–25%, 50–50%, 25–75%, and 0–100%—in which the total volume fraction of fibers (Vf) remains constant at 1%; and two lengths of lap splices for rebars of 16 mm diameter (db): 10 db and 15 db. The test results showed that the best range of steel–polyolefin fibers that gave the highest bond strength was 50–50%. The ductility of the fiber-reinforced recycled-aggregate (FR-RA) concrete was significantly improved for all the cases of various relative ratios of steel and polyolefin fibers. The bond strength was also predicted using three empirical equations proposed by Orangun et al., Darwin et al., and Harajli. This study showed that the Harajli equation gave a more accurate estimation of the bond strength of reinforcing bars embedded in FR-RA concrete than those proposed by Orangun et al. and Darwin et al.

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使用钢-聚烯烃纤维加固的再生骨料混凝土中的拉伸搭接件

实验研究了使用混合（钢-聚烯烃）纤维加固的再生粗集料加固混凝土拉伸搭接处的粘结强度。这项研究使用了 12 个搭接梁试件。再生混凝土骨料（RCA）对天然粗骨料的替代率为 100%。研究了以下变量：不同范围的钢-聚烯烃纤维--100-0%、75-25%、50-50%、25-75% 和 0-100%，其中纤维的总体积分数（Vf）保持不变，为 1%；直径为 16 毫米（db）的钢筋的两种搭接长度：10 db 和 15 db。试验结果表明，钢-聚烯烃纤维的最佳粘合强度范围为 50-50%。在各种钢纤维和聚烯烃纤维相对比例的情况下，纤维增强再生骨料（FR-RA）混凝土的延展性都有显著提高。此外，还使用 Orangun 等人、Darwin 等人和 Harajli 提出的三个经验公式预测了粘结强度。研究结果表明，与 Orangun 等人和 Darwin 等人提出的公式相比，Harajli 公式对嵌入 FR-RA 混凝土中的钢筋粘结强度的估算更为准确。

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

Fibers Engineering-Civil and Structural Engineering

CiteScore

7.00

自引率

7.70%

发文量

审稿时长

11 weeks

期刊介绍： Fibers (ISSN 2079-6439) is a peer-reviewed scientific journal that publishes original articles, critical reviews, research notes and short communications on the materials science and all other empirical and theoretical studies of fibers, providing a forum for integrating fiber research across many disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. The following topics are relevant and within the scope of this journal: -textile fibers -natural fibers and biological microfibrils -metallic fibers -optic fibers -carbon fibers -silicon carbide fibers -fiberglass -mineral fibers -cellulose fibers -polymer fibers -microfibers, nanofibers and nanotubes -new processing methods for fibers -chemistry of fiber materials -physical properties of fibers -exposure to and toxicology of fibers -biokinetics of fibers -the diversity of fiber origins