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Effect of fiber orientation on the rate-dependent flexural behavior of ultra-high-performance fiber-reinforced concrete

机译：纤维取向对超高性能纤维增强混凝土速率相关弯曲性能的影响

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This study aims to investigate the effect of fiber orientation on the flexural behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) under quasi-static and impact loadings. Two placement methods and two specimen sizes were considered to provide different fiber orientations, and image analysis was carried out to quantitatively evaluate the fiber orientation. Quasi-static flexural tests were performed according to ASTM standard, while impact tests were performed with two different potential energies (0.48 and 1.13 kJ) using a drop-weight impact test machine. Test results indicated that under quasi-static loading conditions, higher flexural strength, normalized deflection capacity, and toughness were obtained in the beams that contained better fiber orientation in the direction of the tensile load compared to those with poor fiber orientation; however, no obvious difference in the first-cracking properties was observed with respect to the fiber orientation. Under impact loading conditions, the flexural strength and energy absorption capacity were both increased with better fiber orientation, and a greater increase in the flexural strength with strain-rate was obtained in the beams with better fiber orientation at an identical potential energy (relative to their counterparts with poorer orientation). Therefore, providing good fiber orientation can be an effective way to improve the impact resistance of UHPFRC beams. (C) 2016 Elsevier Ltd. All rights reserved.
机译：这项研究旨在研究准静态和冲击载荷下纤维取向对超高性能纤维增强混凝土（UHPFRC）抗弯性能的影响。两种放置方法和两种样本尺寸被认为可以提供不同的纤维取向，并且进行了图像分析以定量评估纤维取向。根据ASTM标准进行了准静态挠曲测试，而使用落锤式冲击试验机以两种不同的势能（0.48和1.13 kJ）进行了冲击试验。试验结果表明，在准静态载荷条件下，与纤维取向较差的梁相比，在拉伸载荷方向上纤维取向较好的梁，其抗弯强度，归一化挠度和韧性均较高。然而，关于纤维取向，未观察到第一裂化性能的明显差异。在冲击载荷条件下，纤维取向较好时，弯曲强度和能量吸收能力都增加，并且在相同势能下，纤维取向较好的梁的抗弯强度随应变率的增加更大。方向较差的人）。因此，提供良好的纤维取向可以是提高UHPFRC梁抗冲击性的有效方法。 （C）2016 Elsevier Ltd.保留所有权利。

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