Scholarlink

<p>In this work, the mechanical properties of hybrid fiber-reinforced cementitious composites (CP-ECCs) composed of polypropylene fibers (PPs) with varying volume fractions and 1% volume fraction chopped carbon fibers (CFs), as well as the influence of different fly ash (FA) contents on material performance under both room temperature (20&#xa0;°C) and high-temperature conditions, are systematically studied. Through experiments conducted at five target temperatures (20, 200, 400, 600, and 800&#xa0;°C), the residual mechanical properties, fundamental mechanical properties, and microstructural evolution patterns of the CP-ECC were analyzed. The results indicated that the mechanical properties of the material generally tended to increase with increasing temperature, reaching peak strength at 600&#xa0;°C, followed by a significant decrease at 800&#xa0;°C. Scanning electron microscopy (SEM) analysis revealed that the incorporation of PP fibers effectively suppressed cracking and spalling in concrete at 600&#xa0;°C. Moreover, the carbon fiber-like reinforcement structure formed by the CF fibers and molten PP fibers further enhanced the mechanical properties of the ECCs at elevated temperatures. This study innovatively designed a novel high-temperature resistant hybrid fiber ECC material. This material provides a new theoretical foundation for the application of ECCs in high-temperature environments, with significant theoretical value and practical significance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Research on the residual mechanical properties of hybrid fiber ECCs after high-temperature exposure

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月19日

查看全文
  • Jinyu Cui,
  • Hao Jiang,
  • Yunlong Zhang,
  • Ao Zhang

摘要

In this work, the mechanical properties of hybrid fiber-reinforced cementitious composites (CP-ECCs) composed of polypropylene fibers (PPs) with varying volume fractions and 1% volume fraction chopped carbon fibers (CFs), as well as the influence of different fly ash (FA) contents on material performance under both room temperature (20 °C) and high-temperature conditions, are systematically studied. Through experiments conducted at five target temperatures (20, 200, 400, 600, and 800 °C), the residual mechanical properties, fundamental mechanical properties, and microstructural evolution patterns of the CP-ECC were analyzed. The results indicated that the mechanical properties of the material generally tended to increase with increasing temperature, reaching peak strength at 600 °C, followed by a significant decrease at 800 °C. Scanning electron microscopy (SEM) analysis revealed that the incorporation of PP fibers effectively suppressed cracking and spalling in concrete at 600 °C. Moreover, the carbon fiber-like reinforcement structure formed by the CF fibers and molten PP fibers further enhanced the mechanical properties of the ECCs at elevated temperatures. This study innovatively designed a novel high-temperature resistant hybrid fiber ECC material. This material provides a new theoretical foundation for the application of ECCs in high-temperature environments, with significant theoretical value and practical significance.