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首页> 外文期刊>Journal of advanced concrete technology >Effect of Wollastonite Microfiber on Ultra-High-Performance Fiber-Reinforced Cement-Based Composites Based on Application of Multi-Scale Fiber-Reinforcement System
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Effect of Wollastonite Microfiber on Ultra-High-Performance Fiber-Reinforced Cement-Based Composites Based on Application of Multi-Scale Fiber-Reinforcement System

机译：基于多尺度纤维增强体系的硅灰石超细纤维对超高性能纤维增强水泥基复合材料的影响

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The development of ultra-high-performance fiber-reinforced cement-based composites (UHP-FRCCs) was motivated by the need for a new and versatile material with high energy absorption capacity. With its excellent cracking resistance and consequent long life, UHP-FRCC is suitable for use in seismic design applications. The present study proposes a material design concept based on a multi-scale fiber-reinforcement system. In this approach, long, thick macrofibers are blended with short, thin mesofibers and microfibers. Such a combination of macrofibers, mesofibers, and microfibers is expected to enhance the mechanical properties of the composite under tension. However, the ductility of cement-based composites reinforced solely by microfibers is largely unknown. Therefore, in this study, the authors assessed whether microfiber improves the ductility of UHP-FRCC in two series of experiments. Wollastonite, which is a needle-shape mineral, is employed as a microfiber, and two different types of steel fibers are used as meso- and macrofibers. First, the enhanced toughness was evaluated in three-point bending tests on notched mortar beams. Second, the influence of wollastonite microfiber on the mechanical properties of the blended multi-scale fiber-reinforcement system was evaluated in uniaxial tension tests. Blends of macrofibers, mesofibers, and wollastonite microfibers exhibited strong reinforcement characteristics. The results indicate that the ductility of composites reinforced with wollastonite microfibers is highly dependent on the microfiber contents and type of fiber used and that blending of micro-, meso-, and macrofibers produces a highly ductile UHP-FRCC. Thus the material design concept based on the multi-scale fiber-reinforcement system proposed in this paper was shown to be effective in increasing the ductility of UHP-FRCC, even under uniaxial tension.
机译：对超高性能纤维增强水泥基复合材料（UHP-FRCC）的开发是受对具有高能量吸收能力的新型多功能材料的需求所推动的。 UHP-FRCC具有出色的抗裂性和较长的使用寿命，适用于抗震设计应用。本研究提出了一种基于多尺度纤维增强系统的材料设计概念。用这种方法，将长而粗的大纤维与短而细的中纤维和微纤维混合。预期大纤维，中纤维和微纤维的这种组合可增强复合材料在拉伸下的机械性能。但是，仅由微纤维增强的水泥基复合材料的延展性在很大程度上是未知的。因此，在这项研究中，作者在两个系列的实验中评估了微纤维是否能改善UHP-FRCC的延展性。针状矿物硅灰石被用作超细纤维，两种不同类型的钢纤维被用作中细纤维和大纤维。首先，在缺口砂浆梁的三点弯曲试验中评估了增强的韧性。其次，在单轴拉伸试验中评估了硅灰石微纤维对混合多尺度纤维增强体系机械性能的影响。大纤维，中纤维和硅灰石微纤维的混合物表现出强的增强特性。结果表明，硅灰石微纤维增强的复合材料的延展性高度依赖于所用纤维的微纤维含量和类型，并且微纤维，中纤维和大纤维的混合产生了高延展性的UHP-FRCC。因此，本文提出的基于多尺度纤维增强系统的材料设计概念被证明可以有效地提高UHP-FRCC的延展性，即使在单轴拉伸下也是如此。

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