Flexural behavior of steel fiber reinforced concrete beams comprising coarse and fine rubber and strengthened by CFRP sheets

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-10-05 DOI:10.37868/hsd.v5i2.257

Adnan Abdullah Adday, Ahmed Sultan Ali

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Abstract

Despite having many advantages, using rubber to produce reinforced concrete members like beams is still restricted. When there is more waste tire rubber in concrete structures, rubber concrete's flexural and compressive strengths gradually decrease. However, this study used steel fibers to improve compressive strength and externally bonded carbon fiber-reinforced polymer (CFRP) sheets to increase flexural strength. Four groups of three reinforced concrete beams each were established for the study's use. The first and third groups of concrete beams used a volumetric replacement of fine and coarse aggregates with 5% and 10% waste tire rubber. However, steel fibers were added to the second and third groups at a rate of 1.25% of the concrete volume. Waste tire rubber and steel fibers were not replaced or added to the fourth group, the main reference group. The dimensions of each beam were 2.1×0.2×0.3 m. A concrete beam's first member is always free of external reinforcement, followed by its second member, which has one layer, and its third member, which has two layers of CFRP sheet. ABAQUS, a finite element analysis program, was used numerically to represent the third strengthening layer. The results showed that strengthening the reinforced rubberized concrete beams with a single layer of CFRP sheets increased the load at first crack and failure by 8.57% and 17.64%, respectively, compared to the unreinforced reference beam, compensating for the loss caused by the production of rubberized concrete and adding additional flexural strength. These loads increased by 31.43% and 26.45%, respectively, due to the steel fibers added to the beams containing these waste tire rubber. Strengthening with two layers of CFRP sheets increased the load at first crack and failure by 17.14 and 34.27, respectively. The steel fibers added to the beams that contained these amounts of waste tire rubber, on the other hand, caused these loads to increase by 42.86 and 49.23%, respectively. Strengthening with three layers numerically results in an exponential increase in load at the first crack and the failure by 8.03 and 52.88%, respectively. On the other hand, the loads on the beams that contained these quantities of waste tire rubber increased by 50.49% and 104.47%, respectively, when steel fibers were added to them.

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由粗橡胶和细橡胶组成并由CFRP板加固的钢纤维混凝土梁的受弯性能

尽管橡胶有许多优点，但使用橡胶制造钢筋混凝土构件(如梁)仍然受到限制。当废轮胎橡胶在混凝土结构中的用量增加时，橡胶混凝土的抗折强度和抗压强度逐渐降低。然而，本研究使用钢纤维来提高抗压强度，并使用外部粘合的碳纤维增强聚合物(CFRP)板来提高抗弯强度。四组钢筋混凝土梁，每组三根，用于研究使用。第一组和第三组混凝土梁使用5%和10%废轮胎橡胶代替细骨料和粗骨料。然而，钢纤维以混凝土体积的1.25%添加到第二和第三组中。废轮胎橡胶和钢纤维没有被替换或添加到第四组，即主要参照组。每根梁的尺寸为2.1×0.2×0.3 m。混凝土梁的第一个构件总是没有外部加固，其次是它的第二个构件，它有一层，它的第三个构件，它有两层碳纤维布。采用有限元分析软件ABAQUS对第三强化层进行数值表示。结果表明:单层碳纤维布加固橡胶混凝土梁的初裂荷载和破坏荷载分别比未加筋参考梁提高8.57%和17.64%，弥补了橡胶混凝土生产造成的损失，增加了额外的抗弯强度;由于在含有这些废轮胎橡胶的梁中添加钢纤维，这些荷载分别增加了31.43%和26.45%。两层碳纤维布加固后，初裂荷载和破坏荷载分别增加17.14%和34.27%。另一方面，将钢纤维添加到含有这些废轮胎橡胶的梁中，使这些载荷分别增加了42.86%和49.23%。三层强化的数值结果表明，第一裂纹处的荷载和破坏荷载分别增加了8.03和52.88%。另一方面，添加钢纤维后，含废轮胎橡胶的梁的荷载分别提高了50.49%和104.47%。

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.