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<p>Fire safety is essential in construction, as accidental fires subject concrete structures to high temperatures that result in significant damage. This study examines the development of self-compacting concrete (SCC) characteristics with barite heavyweight aggregate (20–100% substitution of natural coarse aggregate) after being exposed to 600&#xa0;°C, followed by several post-fire re-curing methods (water, CO<sub>2</sub>, water-glass, and air). The property evolution was examined for cracking, density loss, residual compressive strength, and ultrasonic behavior, verified by FTIR, MIP, and SEM–EDX tests. The exposure to 600&#xa0;°C resulted in widespread microcracking, significant mass loss, and decreased strength, besides the severity increasing with higher barite concentrations due to the brittleness and thermal sensitivity of heavyweight aggregate. Post-fire curing demonstrated specific recovery mechanisms: water curing promoted rehydration and achieved partial strength recovery of approximately 75% of pre-fire values; CO<sub>2</sub> curing improved densification via carbonation but resulted in increased brittleness; water-glass curing partially filled cracks but decreased long-term stability; and air curing caused additional drying shrinkage and further deterioration. The results highlight the interrelated chemical and microstructural changes that influence the post-fire development of SCC characteristics, revealing that water and CO<sub>2</sub> re-curing are the most effective methods for performance restoration.</p>

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Influence of post-fire recuring regimes on the properties of self-compacting concrete with heavyweight aggregate

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月14日

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  • Taher A. Tawfik,
  • Martin T. Palou,
  • František Šoukal,
  • Eva Kuzielová,
  • Peter Peciar,
  • Mahmoud Gharieb,
  • Sheelan Mahmoud Hama,
  • Jozef Švorec

摘要

Fire safety is essential in construction, as accidental fires subject concrete structures to high temperatures that result in significant damage. This study examines the development of self-compacting concrete (SCC) characteristics with barite heavyweight aggregate (20–100% substitution of natural coarse aggregate) after being exposed to 600 °C, followed by several post-fire re-curing methods (water, CO2, water-glass, and air). The property evolution was examined for cracking, density loss, residual compressive strength, and ultrasonic behavior, verified by FTIR, MIP, and SEM–EDX tests. The exposure to 600 °C resulted in widespread microcracking, significant mass loss, and decreased strength, besides the severity increasing with higher barite concentrations due to the brittleness and thermal sensitivity of heavyweight aggregate. Post-fire curing demonstrated specific recovery mechanisms: water curing promoted rehydration and achieved partial strength recovery of approximately 75% of pre-fire values; CO2 curing improved densification via carbonation but resulted in increased brittleness; water-glass curing partially filled cracks but decreased long-term stability; and air curing caused additional drying shrinkage and further deterioration. The results highlight the interrelated chemical and microstructural changes that influence the post-fire development of SCC characteristics, revealing that water and CO2 re-curing are the most effective methods for performance restoration.