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首页> 外文期刊>Journal of Civil Engineering and Management >LABORATORY STUDY ON THE INFLUENCE OF CASTING ON PROPERTIES OF ULTRA-HIGH PERFORMANCE FIBRE REINFORCED CONCRETE (UHPFRC) SPECIMENS
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LABORATORY STUDY ON THE INFLUENCE OF CASTING ON PROPERTIES OF ULTRA-HIGH PERFORMANCE FIBRE REINFORCED CONCRETE (UHPFRC) SPECIMENS

机译：铸造对超高性能纤维增强混凝土（UHPFRC）试样性能影响的实验室研究

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摘要

This paper presents a study on the effects of casting procedure and resulting fibre orientation on the properties of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC). To investigate the impact of fibre orientation in the UHPFRC specimens, three approaches were employed. First, densities were measured from the top, middle and bottom zones of the cylinders to observe physical changes as the function of cylinder height. Secondly, two engineering fracture tests were performed in both compression and tension, and a comparison of fracture energies was conducted between different cylinder zones. While previous studies have explored the influence of steel fibres on the UHPFRC performance, the Semi-Circular Bending (SCB) and Disc Compact Tension (DCT) experimental setups have not yet been used in the UHPFRC fracture testing. Lastly, samples from different zones were scanned using X-ray computer tomography (X-ray CT). Both visual and digital image analysis of the X-ray scans were conducted in order to observe fibre orientation pattern changes within different zones. Although density calculations showed insignificant differences between different zones, fracture testing exhibited significant differences through the testing process as well as through fracture energy computations. Furthermore, X-ray CT demonstrated considerable differences in spatial fibre orientation with respect to two uniquely defined angles.
机译：本文介绍了铸造工艺和所得纤维取向对超高性能纤维增强混凝土（UHPFRC）性能的影响的研究。为了研究UHPFRC样品中纤维取向的影响，采用了三种方法。首先，从圆柱体的顶部，中间和底部区域测量密度，以观察作为圆柱体高度函数的物理变化。其次，在压缩和拉伸方面进行了两次工程断裂试验，并比较了不同圆柱区之间的断裂能。尽管先前的研究已经探索了钢纤维对UHPFRC性能的影响，但是UHPFRC断裂测试中尚未使用半圆形弯曲（SCB）和盘压紧张力（DCT）实验装置。最后，使用X射线计算机断层扫描（X射线CT）扫描来自不同区域的样品。进行了X射线扫描的视觉和数字图像分析，以观察不同区域内纤维取向图案的变化。尽管密度计算显示出不同区域之间的差异不明显，但裂缝测试在整个测试过程以及裂缝能量计算中均表现出显着差异。此外，X射线CT证明相对于两个唯一定义的角度，空间纤维方向存在明显差异。

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