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<p>Enhancing the fire resilience of concrete structures is a critical challenge in construction engineering, prompting the investigation of innovative additives to improve the performance of reactive powder concrete (RPC) under high-temperature conditions. This study explores the effects of incorporating waste marble powder (WMP) and metal fibers (MF) on RPC’s physical and mechanical properties exposed to elevated temperatures. Two RPC formulations were prepared: a reference RPC (C1-RPC) without additives and an experimental RPC (C2-RPC) with 10% WMP and 2% MF, maintaining a consistent water-to-binder ratio of 0.25. The samples were subjected to temperature levels of 20&#xa0;°C, 200&#xa0;°C, 500&#xa0;°C, and 800&#xa0;°C. Key parameters, including mass loss, water porosity, compressive strength, and flexural tensile strength, were measured at 28 and 206 days. In addition, Scanning Electron Microscopy (SEM) was used to analyze the microstructural changes of C2-RPC after high-temperature exposure. The experimental results revealed that C2-RPC exhibited enhanced physical and mechanical properties compared to C1-RPC, particularly regarding fire resistance. Incorporating 10% WMP and 2% MF significantly improved RPC’s durability and structural integrity at elevated temperatures. These findings suggest that using WMP and MF in RPC formulations offers a sustainable and practical approach to improving the fire performance of concrete, contributing to more resilient construction materials.</p>

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Exploring the potential of waste marble powder and metal fibers for enhancing reactive powder concrete performance at elevated temperatures

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Mounira Chadli,
  • Kamal Saleh Almeasar,
  • Sara Rais,
  • Mekki Mellas,
  • Ammar Hamlaoui

摘要

Enhancing the fire resilience of concrete structures is a critical challenge in construction engineering, prompting the investigation of innovative additives to improve the performance of reactive powder concrete (RPC) under high-temperature conditions. This study explores the effects of incorporating waste marble powder (WMP) and metal fibers (MF) on RPC’s physical and mechanical properties exposed to elevated temperatures. Two RPC formulations were prepared: a reference RPC (C1-RPC) without additives and an experimental RPC (C2-RPC) with 10% WMP and 2% MF, maintaining a consistent water-to-binder ratio of 0.25. The samples were subjected to temperature levels of 20 °C, 200 °C, 500 °C, and 800 °C. Key parameters, including mass loss, water porosity, compressive strength, and flexural tensile strength, were measured at 28 and 206 days. In addition, Scanning Electron Microscopy (SEM) was used to analyze the microstructural changes of C2-RPC after high-temperature exposure. The experimental results revealed that C2-RPC exhibited enhanced physical and mechanical properties compared to C1-RPC, particularly regarding fire resistance. Incorporating 10% WMP and 2% MF significantly improved RPC’s durability and structural integrity at elevated temperatures. These findings suggest that using WMP and MF in RPC formulations offers a sustainable and practical approach to improving the fire performance of concrete, contributing to more resilient construction materials.