Relationship between fiber orientation/distribution and post-cracking behaviour in ultra-high-performance fiber-reinforced concrete (UHPFRC)
Relationship between fiber orientation/distribution and post-cracking behaviour in ultra-high-performance fiber-reinforced concrete (UHPFRC)
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DOI：
10.1016/j.cemconcomp.2017.07.007
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发表时间：
2017-10-01
影响因子：
10.5
通讯作者：
Uchida, Yuichi
中科院分区：
文献类型：
--
作者：
Zhou, Bo;Uchida, Yuichi
定量研究了超高性能纤维混凝土（UHPFRC）中纤维取向分布与开裂后性能的关系。圆形UHPFRC板从其中心铸造，棱柱形试样以试样轴线和板的径向方向之间的0度、30度、60度和90度的角度切割。用三点弯曲试验评估开裂后行为，然后使用图像分析和基于X射线计算机断层扫描（CT）数据的纤维取向的3D可视化来评估整个面板的纤维取向/分布。在60，30和0度的角度切割的试样的开裂后的弯曲强度分别为80，40和10%的试样在90度的角度切割，表明完美的线性依赖于附近的断裂表面的纤维的贡献。两个矩形UHPFRC面板与1：2的宽度/长度比铸造，并发现类似的纤维取向特性的圆形和矩形面板。(C)2017爱思唯尔有限公司版权所有
The relationship between fiber orientation/distribution and post-cracking behaviour in ultra-high-performance fiber-reinforced concrete (UHPFRC) was quantitatively evaluated. A circular UHPFRC panel was cast from its center and prismatic specimens were cut at angles of 0, 30, 60 and 90 degrees between the specimen axis and the radial direction of the panel. The post-cracking behaviour was assessed with three-poiht bending tests, and fiber orientation/distribution throughout the panel was then evaluated using image analysis and 3D visualization of fiber orientation based on X-ray computed tomography (CT) data. The post-cracking flexural strengths of the specimens cut at angles of 60, 30 and 0 degrees were 80, 40 and 10% of that for the specimens cut at an angle of 90 degrees, indicating perfect linear dependence on the contribution of fibers near the fracture surfaces. Two rectangular UHPFRC panels with a 1:2 width/length ratio were cast, and similar fiber orientation characteristics were found for the circular and rectangular panels. (C) 2017 Elsevier Ltd. All rights reserved.