Abstract
In the present study, the mechanical properties of polyvinyl alcohol (PVA)-basalt hybrid fiber reinforced engineered cementitious composites (ECC) after exposure to elevated temperatures were experimentally investigated. Five temperatures of 20, 50, 100, 200 and 400 °C were set to evaluate the residual compressive, tensile and flexural behaviors of hybrid and mono fiber ECC. It was shown that partial replacement of PVA fibers with basalt fibers endowed ECC with improved residual compressive toughness, compared to brittle failure of mono fiber ECC heated to 400 °C. The tension tests indicated that the presence of basalt fibers benefited the tensile strength up to 200 °C, and delayed the sharp reduction of strength to 400 °C. Under flexural load, the peak deflections corresponding to flexural strengths of hybrid fiber ECC were found to be less vulnerable ranging from 20 to 100 °C. Further, the scanning electron microscopy (SEM) results uncovered that the rupture of basalt fiber at moderate temperature and its pullout mechanism at high temperature was responsible for the mechanical evolution of hybrid fiber ECC. This work develops a better understanding of elevated temperature and basalt fiber impact on the residual mechanical properties and further provides guideline for tailoring ECC for improved fire resistance.
摘要
本文试验研究了混杂聚乙烯醇(PVA)-玄武岩纤维延性水泥基材料(ECC)暴露于高温后的力学性 能。测试了混杂和单掺纤维ECC 分别经历20, 50, 100, 200 和400 °C 温度后的残余抗压、抗拉和抗 弯力学行为。结果表明: 相较于单掺纤维ECC 在400 °C 的脆性破坏, 玄武岩纤维部分取代PVA 纤维 可使ECC 获得更高的抗压韧性; 在拉伸试验中, 玄武岩纤维有利于在20 ℃~200 °C 范围内提高抗拉 强度, 并将强度急剧下降推迟到400 °C; 在弯曲荷载下, 混杂纤维ECC 抗弯强度对应的峰值挠度在 20~100 °C 范围内变化较小。此外, 扫描电镜(SEM)结果显示, 玄武岩纤维在中温下的断裂和高温下的 拔出机制是混杂纤维ECC 力学性能演变的主要原因。本研究可帮助理解高温和玄武岩纤维对ECC 残 余力学性能的影响规律, 并进一步为调整ECC 获得改进的耐火性能提供指导。
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Project(51808545) supported by the National Natural Science Foundation of China; Project(8184083) supported by the Beijing Natural Science Foundation, China; Project(2021YQLJ05) supported by the Fundamental Research Funds for the Central Universities, China
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The overarching research goals were developed by WANG Zhen-bo, HAN Shuo, and WANG Qing. SUN Peng, LIU Wei-kang and HAN Shuo performed the experiments and provided the measured data. WANG Zhen-bo and HAN Shuo analyzed the measured data. The initial draft of the manuscript was written by WANG Zhen-bo. All authors replied to reviewers’ comments and revised the final version.
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WANG Zhen-bo, HAN Shuo, SUN Peng, LIU Wei-kang, and WANG Qing declare that they have no conflict of interest.
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Wang, Zb., Han, S., Sun, P. et al. Mechanical properties of polyvinyl alcohol-basalt hybrid fiber engineered cementitious composites with impact of elevated temperatures. J. Cent. South Univ. 28, 1459–1475 (2021). https://doi.org/10.1007/s11771-021-4710-1
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DOI: https://doi.org/10.1007/s11771-021-4710-1