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首页> 美国卫生研究院文献>Materials >Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete
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Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

机译：纤维对活性粉末混凝土高温力学性能和微观结构的影响

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摘要

This study was aimed to investigate the effect of steel, polypropylene (PP), and hybrid (steel + PP) fibers on high-temperature mechanical properties of reactive powder concrete (RPC). The mechanical properties considered are cubic compressive strength, axial or prismatic compressive strength, split-tensile strength, flexural strength, elastic modulus, peak strain, and stress-strain behavior. The strength recession due to high temperature was investigated at micro level by scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray diffraction, mercury intrusion porosity, thermogravimetric, and differential scanning calorimetry analyses. The high-temperature tests were carried out at target temperatures of 120, 300, 500, 700, and 900 °C. The hot-state compressive strength of RPC started to decrease at 120 °C; however, a partial recovery at 300 °C and a gradual decrease above 300 °C were observed. The degradation of split-tensile strength, flexural strength, and elastic modulus were gradual with increasing temperature despite the effect of different fibers. Whereas, the peak strain was gradually increasing up to 700 °C. However, after 700 °C, it remained unchanged. Steel fiber reinforced RPC (SRPC) and hybrid fiber reinforced RPC (HRPC) showed a ductile behavior. PP fiber reinforced RPC (PRPC) showed a quite brittle behavior up to 300 °C; however, further heating made the microstructure porous and it became ductile too. Overall the performance of SRPC and HRPC were superior to PRPC because of higher modulus of elasticity, higher strength, and better fire resistance of steel fibers. Fiber reinforced RPC was found to have better fire resistance than traditional types of concrete based on comparative studies with the provisions of design codes and earlier research. The constitutive equations developed can be utilized in computer programs for structural design of RPC structures exposed to fire.
机译：这项研究旨在研究钢，聚丙烯（PP）和混合纤维（钢+ PP）对活性粉末混凝土（RPC）高温机械性能的影响。考虑的机械性能为立方抗压强度，轴向或棱柱抗压强度，抗拉强度，抗弯强度，弹性模量，峰值应变和应力应变行为。通过扫描电子显微镜，能量色散X射线光谱，X射线衍射，水银压入孔隙率，热重分析和差示扫描量热分析，从微观角度研究了高温引起的强度下降。高温测试是在120、300、500、700和900°C的目标温度下进行的。 RPC的热态抗压强度在120°C时开始下降。但是，在300°C时会部分恢复，而在300°C以上时会逐渐降低。尽管不同纤维的影响，但随着温度的升高，抗拉强度，抗弯强度和弹性模量的降低是逐渐的。而峰值应变逐渐升高到700°C。然而，在700℃之后，它保持不变。钢纤维增强RPC（SRPC）和混合纤维增强RPC（HRPC）表现出韧性。 PP纤维增强RPC（PRPC）在高达300°C的温度下表现出相当脆的性能。然而，进一步的加热使微结构多孔并且也变得延展。总体而言，SRPC和HRPC的性能优于PRPC，这是因为钢纤维具有更高的弹性模量，更高的强度和更好的耐火性。根据具有设计规范和早期研究规定的比较研究，发现纤维增强的RPC具有比传统混凝土更好的耐火性。所开发的本构方程可在计算机程序中用于暴露于火的RPC结构的结构设计。

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