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<p>The use of high-performance fiber-reinforced concrete (HPFRC) in construction exposed to elevated-temperature or fire conditions has been an attractive topic due to concerns over structural safety. This study focuses on the compressive behavior of HPFRC after exposure to 300&#xa0;°C and 500&#xa0;°C for 2&#xa0;hours, in addition to that at 25&#xa0;°C. The experiments were conducted on HPFRC cubic samples (40, 70, 100&#xa0;mm) with varying contents of microfiber and macro hooked steel fibers, ranging from 0% to 1.5%. The results showed that increasing steel fiber content enhanced compressive strength and energy absorption capacity by 0.94% to 9.44% and 1.72% to 19.15%, respectively. Relative to 25&#xa0;°C, the exposure of HPFRCs to 300&#xa0;°C resulted in a 4.61-8.43% increase in compressive strength, whereas the strain capacity declined by 2.61-14.23%, regardless of fiber dosage. Meanwhile, the energy absorption capacity demonstrated an unclear trend. The exposure to 500&#xa0;°C caused severe thermal damage in the HPFRC samples, leading to fragmentation failure. In addition, a pronounced size effect on compressive strength was observed at both 25&#xa0;°C and after exposure to 300&#xa0;°C. The Weibull modulus characterizing the brittleness of HPFRCs ranged from 12.85 to 24.27.</p>

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Comparative Compressive Resistance of High-Performance Fiber-Reinforced Concrete Exposed to Normal and Elevated Temperature with Size Effect

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Huu-Nghia Nguyen,
  • Duy-Liem Nguyen

摘要

The use of high-performance fiber-reinforced concrete (HPFRC) in construction exposed to elevated-temperature or fire conditions has been an attractive topic due to concerns over structural safety. This study focuses on the compressive behavior of HPFRC after exposure to 300 °C and 500 °C for 2 hours, in addition to that at 25 °C. The experiments were conducted on HPFRC cubic samples (40, 70, 100 mm) with varying contents of microfiber and macro hooked steel fibers, ranging from 0% to 1.5%. The results showed that increasing steel fiber content enhanced compressive strength and energy absorption capacity by 0.94% to 9.44% and 1.72% to 19.15%, respectively. Relative to 25 °C, the exposure of HPFRCs to 300 °C resulted in a 4.61-8.43% increase in compressive strength, whereas the strain capacity declined by 2.61-14.23%, regardless of fiber dosage. Meanwhile, the energy absorption capacity demonstrated an unclear trend. The exposure to 500 °C caused severe thermal damage in the HPFRC samples, leading to fragmentation failure. In addition, a pronounced size effect on compressive strength was observed at both 25 °C and after exposure to 300 °C. The Weibull modulus characterizing the brittleness of HPFRCs ranged from 12.85 to 24.27.