Effects of concrete flow on the distribution and orientation of fibers and flexural behavior of steel fiber-reinforced self-compacting concrete beams
Effects of concrete flow on the distribution and orientation of fibers and flexural behavior of steel fiber-reinforced self-compacting concrete beams
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DOI：
10.1016/j.conbuildmat.2020.119963
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发表时间：
2020-11-30
影响因子：
7.4
通讯作者：
Kageyama, Takumi
中科院分区：
文献类型：
--
作者：
Raju, Ramiz Ahmed;Lim, Sopokhem;Kageyama, Takumi
钢纤维增强混凝土构件中纤维的偏析和取向不良是由制造过程中的几个参数引起的。自密实纤维增强混凝土（SCFRC）具有高流动性和高压实性，可以作为传统SFRC的替代品，因为它具有更好的取向和更少的纤维离析。本研究旨在利用x射线图像研究(1)混凝土类型（即SCFRC与SFRC）、纤维含量和试件深度对纤维分布和取向的影响；(2)考虑纤维分布和取向的SCFRC和SFRC梁的结构性能。x射线图像表明，由于高流动特性，SCFRC光束比SFRC光束表现出更低的纤维偏析和更好的光纤取向。弯曲试验结果表明，由于纤维的分布和取向的改善，SCFRC梁的抗弯性能优于SFRC梁。此外，考虑到x射线图像中观察到的不同光纤分布特性，进行了有限元分析来评估光束的结构性能。有限元方法可以区分出SCFRC梁优于SFRC梁的结构性能。(C) 2020 Elsevier Ltd.版权所有。
Several parameters during the fabrication process cause segregation and poor orientation of the fibers in steel fiber-reinforced concrete (SFRC) members. With its high flowability and compactability, self-compacting fiber-reinforced concrete (SCFRC) can be used as an alternative to conventional SFRC, as it exhibits improved orientation and lesser fiber segregation. This study aims to investigate (1) the effects of concrete type (i.e., SCFRC versus SFRC), fiber content, and specimen depth on the fiber distribution and orientation and (2) the structural performance of SCFRC and SFRC beams considering their fiber distribution and orientation using X-ray images. The X-ray images showed that owing to the high-flow properties, the SCFRC beams exhibited a lower fiber segregation and better fiber alignment than the SFRC beams. The bending test results demonstrated that the SCFRC beams exhibited better flexural performance than the SFRC beams owing to the improved distribution and orientation of the fibers. Moreover, a finite element (FE) analysis was performed to evaluate the structural performance of the beams considering the varying fiber distribution properties observed in the X-ray images. The FE method could differentiate the superior structural performance of the SCFRC beam from that of the SFRC beam. (C) 2020 Elsevier Ltd. All rights reserved.