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<p>This study investigated how adding polypropylene fiber (PPF) in amounts ranging from 0 to 2% affects the mechanical and microstructural properties of reactive powder concrete (RPC) when exposed to high temperatures. After curing the composite specimens for 28 days, they were heat-treated at temperatures of 200 ºC, 400 ºC, 600 ºC, 800 ºC, and 1000 ºC. The effects of these elevated temperatures on the compressive strength, ultrasonic pulse velocity, and mass loss of concrete specimens were thoroughly analyzed. Multiple analytical techniques, such as optical microscopy, scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy, were employed to examine the concrete’s microstructure, along with visual inspections of the specimens. The empirical findings indicated an enhancement in compressive strength of 19.74%, 19.11%, 17.19% and 15.40%, alongside a mass reduction of 7.42%, 7.02%, 6.69%, and 7.50%, at a temperature of 400 ◦C for RPC1, RPC2, RPC3, and RPC4, respectively. Moreover, specimens incorporating more than 1% of fibers demonstrated the capacity to preserve compressive strength even at 1000 ºC, thereby mitigating the hazards associated with spalling and explosive failures. Optical microscopy and SEM analyses confirmed that PPF led to a denser microstructure with reduced porosity at 400 ºC. Overall, the use of PPF significantly improves RPC performance under high-temperature conditions.</p>

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Experimental study on the elevated temperature performance of composite reactive powder concrete with polypropylene fiber- a case study

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Ali Akbar Amiri Shiri,
  • Abbas Darbhanzi

摘要

This study investigated how adding polypropylene fiber (PPF) in amounts ranging from 0 to 2% affects the mechanical and microstructural properties of reactive powder concrete (RPC) when exposed to high temperatures. After curing the composite specimens for 28 days, they were heat-treated at temperatures of 200 ºC, 400 ºC, 600 ºC, 800 ºC, and 1000 ºC. The effects of these elevated temperatures on the compressive strength, ultrasonic pulse velocity, and mass loss of concrete specimens were thoroughly analyzed. Multiple analytical techniques, such as optical microscopy, scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy, were employed to examine the concrete’s microstructure, along with visual inspections of the specimens. The empirical findings indicated an enhancement in compressive strength of 19.74%, 19.11%, 17.19% and 15.40%, alongside a mass reduction of 7.42%, 7.02%, 6.69%, and 7.50%, at a temperature of 400 ◦C for RPC1, RPC2, RPC3, and RPC4, respectively. Moreover, specimens incorporating more than 1% of fibers demonstrated the capacity to preserve compressive strength even at 1000 ºC, thereby mitigating the hazards associated with spalling and explosive failures. Optical microscopy and SEM analyses confirmed that PPF led to a denser microstructure with reduced porosity at 400 ºC. Overall, the use of PPF significantly improves RPC performance under high-temperature conditions.