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<p>This study investigates the synergistic effect of nano-silica, steel and polypropylene fibers, and heat curing on the mechanical properties and durability of reactive powder concrete (RPC). By systematically varying the content of nano-silica and fibers and employing different curing methods, this study aimed to bridge the knowledge gap in optimizing RPC performance. To this end, nano-silica (0%, 0.5%, and 1% of cement weight) and steel/polypropylene fibers (0%, 1%, and 2% by volume) were used. Furthermore, three curing methods were employed: conventional wet curing for 28 days, heat curing for 2 or 5 days at 90&#xa0;°C followed by wet curing. The resulting RPC was evaluated for compressive strength, splitting tensile strength, flexural strength, high-temperature resistance, freeze-thaw resistance, and microstructure using SEM. The results demonstrated a positive correlation between nano-silica and heat curing with the improvement of all investigated RPC properties. Additionally, steel fibers significantly enhanced the mechanical properties of RPC, while the impact of polypropylene fibers was negligible. Polypropylene fibers improved the RPC’s resistance to freeze-thaw cycles due to their filling properties, conversely, steel fibers weakened this attribute owing to induced porosity. This research provides valuable insights for tailoring RPC formulations to achieve desired performance characteristics.</p>

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Influence of Steel and Polypropylene Fibers, Nano-Silica and Heat Curing on the Performance of Reactive Powder Concrete

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Kiana Zanganeh Zadeh,
  • Morteza Jamshidi

摘要

This study investigates the synergistic effect of nano-silica, steel and polypropylene fibers, and heat curing on the mechanical properties and durability of reactive powder concrete (RPC). By systematically varying the content of nano-silica and fibers and employing different curing methods, this study aimed to bridge the knowledge gap in optimizing RPC performance. To this end, nano-silica (0%, 0.5%, and 1% of cement weight) and steel/polypropylene fibers (0%, 1%, and 2% by volume) were used. Furthermore, three curing methods were employed: conventional wet curing for 28 days, heat curing for 2 or 5 days at 90 °C followed by wet curing. The resulting RPC was evaluated for compressive strength, splitting tensile strength, flexural strength, high-temperature resistance, freeze-thaw resistance, and microstructure using SEM. The results demonstrated a positive correlation between nano-silica and heat curing with the improvement of all investigated RPC properties. Additionally, steel fibers significantly enhanced the mechanical properties of RPC, while the impact of polypropylene fibers was negligible. Polypropylene fibers improved the RPC’s resistance to freeze-thaw cycles due to their filling properties, conversely, steel fibers weakened this attribute owing to induced porosity. This research provides valuable insights for tailoring RPC formulations to achieve desired performance characteristics.