Investigating the fracture toughness of the self compacting concrete using ENDB samples by changing the aggregate size and percent of steel fiber

Q2 Materials Science

Engineering Solid Mechanics Pub Date : 2023-01-01 DOI:10.5267/j.esm.2023.7.006

S. Mousavi, Mohammad Ghasemi, M. Dehghani

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引用次数: 2

Abstract

In reality, concrete structures are normally under various loadings, and results of different studies have shown that cracks in these structures and their materials, due to their nature as well as the loading type, do not develop along the crack plane (pure mode I); rather, they expand under mixed modes, making the crack growth studies under these modes a very important issue. In the crack growth phenomenon, the fracture toughness is a very effective parameter usually calculated by ENDB samples because they are easy to handle. In this study, several samples were made by changing the maximum aggregates size (dmax = 9.5, 12.5 & 19 mm) and the amount of hooked-end steel fibers (SF = 0.1, 0.3 & 0.5%), and tested under different loading modes (pure/mixed modes I and III) using the strain control jack device. According to the results, the lowest fracture toughness belonged to pure mode III, aggregates with dmax = 12.5 mm performed better in the self-compacting concrete reinforced with steel fiber, Also, the results show that the increasing trend of steel fibers does not have a positive effect on the fracture toughness performance.

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通过改变骨料粒径和钢纤维掺量，研究了自密实混凝土的断裂韧性

在现实中，混凝土结构通常承受各种荷载，不同的研究结果表明，这些结构及其材料的裂缝，由于其性质和荷载类型，不沿裂缝面发展(纯I型);相反，它们在混合模式下扩展，使得在这些模式下的裂纹扩展研究成为一个非常重要的问题。在裂纹扩展现象中，断裂韧性是一个非常有效的参数，通常由ENDB试样计算，因为它易于处理。在本研究中，通过改变最大骨料粒径(dmax = 9.5、12.5和19 mm)和钩端钢纤维用量(SF = 0.1、0.3和0.5%)，制作了几个样品，并使用应变控制千顶装置在不同的加载模式(纯/混合模式I和III)下进行了测试。结果表明，最低断裂韧性属于纯III型，dmax = 12.5 mm骨料在钢纤维增强自密实混凝土中表现较好，且钢纤维的增加趋势对断裂韧性性能没有积极影响。

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

Engineering Solid Mechanics Materials Science-Metals and Alloys

CiteScore

3.00

自引率

0.00%

发文量

期刊介绍： Engineering Solid Mechanics (ESM) is an online international journal for publishing high quality peer reviewed papers in the field of theoretical and applied solid mechanics. The primary focus is to exchange ideas about investigating behavior and properties of engineering materials (such as metals, composites, ceramics, polymers, FGMs, rocks and concretes, asphalt mixtures, bio and nano materials) and their mechanical characterization (including strength and deformation behavior, fatigue and fracture, stress measurements, etc.) through experimental, theoretical and numerical research studies. Researchers and practitioners (from deferent areas such as mechanical and manufacturing, aerospace, railway, bio-mechanics, civil and mining, materials and metallurgy, oil, gas and petroleum industries, pipeline, marine and offshore sectors) are encouraged to submit their original, unpublished contributions.