Uniaxial Tensile Behavior, Flexural Properties, Empirical Calculation and Microstructure of Multi-Scale Fiber Reinforced Cement-Based Material at Elevated Temperature.
Uniaxial Tensile Behavior, Flexural Properties, Empirical Calculation and Microstructure of Multi-Scale Fiber Reinforced Cement-Based Material at Elevated Temperature.
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DOI：
10.3390/ma14081827
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发表时间：
2021-04-07
期刊：
影响因子：
--
通讯作者：
Shi K
中科院分区：
文献类型：
--
作者：
Li L;Khan M;Bai C;Shi K
火灾是水泥基复合材料在使用过程中可能面临的最不利条件之一。研究了钢-聚乙烯醇纤维-碳酸钙晶须（CW）多尺度纤维增强水泥基复合材料（MSFRC）的高温单轴拉伸和弯曲拉伸性能，包括强度、变形能力、耗能能力，并通过经验计算方法对其进行了评估。研究表明，随着处理温度的升高，MSFRC的残余抗弯强度、弯曲韧性、抗拉强度总体下降，但在600 °C时下降缓慢。随着温度的升高，MSFRC的峰值弯曲挠度和峰值拉应变先减小后增大。随着温度的升高，MSSFRC的名义抗弯刚度和名义抗弯刚度逐渐降低，且下降速度快于其强度下降速度。而单轴拉伸性能对温度的敏感性更高，退化更快。建立了MSFRC残余弯曲、抗拉强度和温度之间的定量关系。与现有研究成果的对比表明，MSFRC达到了理想的耐高温效果。多尺度混杂纤维体系显著缓解了高温下水泥基复合材料力学性能的恶化。借助光学显微镜和扫描电镜，揭示了高温对MSFRC单轴拉伸和弯曲性能的影响机理。
Fire is one of the most unfavorable conditions that cement-based composites can face during their service lives. The uniaxial tensile and flexural tensile properties of the steel-polyvinyl alcohol fiber-calcium carbonate whisker (CW) multi-scale fiber reinforced cement matrix composites (MSFRCs) under high temperatures are studied, including strength, deformation capacity, energy dissipation capacity, and its ability to be assessed through the empirical calculation method. The study showed that with the increase of the treatment temperature, the MSFRC residual bending strength, bending toughness, and tensile strength decreased overall, but the decline was slow at 600 °C. The peak flexural deflection and peak tensile strain of MSFRC first reduced and then increased with the increase of the temperature. As the temperature increased, the nominal stiffness of MSFRC bending and straight gradually reduced, and the rate of decline was faster than that of its strength. However, the uniaxial tensile properties were more sensitive to the temperature and degraded more rapidly. A quantitative relationship was established between MSFRC residual bending, tensile strength, and temperature. A comparison with existing research results shows that MSFRC has achieved an ideal effect of high temperature resistance. The multi-scale hybrid fiber system significantly alleviates the deterioration of cement-based composite’s mechanical properties under high temperatures. With the help of an optical microscope and scanning electron microscope (SEM), the high temperature influence mechanism on the uniaxial tensile and flexural properties of MSFRC was revealed.
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