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This study examines the optimal dosage of hybrid polypropylene and steel fibers to enhance the compressive strength of f’c = 280 kg/cm2 concrete exposed to temperatures up to 350 °C. Various proportions of polypropylene fibers (0.10%, 0.25%, and 0.30%) combined with 1% steel fibers were tested, focusing on the effects on concrete strength after thermal exposure. The behavior of the fresh and hardened concrete was assessed, ensuring uniform fiber distribution. Compression tests were conducted at 14 and 28 days, before and after heat exposure. Results indicate that 0.25% polypropylene and 1% steel fibers maintained compressive strength after heating, highlighting this dosage as the most effective. This suggests a key advance in designing fire-resistant concretes for safer, more durable structures.

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Optimal Dosage of Polypropylene and Steel Fibers to Improve Compressive Strength of Concrete at 350 °C

  • 会议论文

  • 发表日期：

    2025年

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  • Alejandro Daniel Pareja Jordan,
  • Ray J. Villacorta,
  • Nayda S. Morales

摘要

This study examines the optimal dosage of hybrid polypropylene and steel fibers to enhance the compressive strength of f’c = 280 kg/cm2 concrete exposed to temperatures up to 350 °C. Various proportions of polypropylene fibers (0.10%, 0.25%, and 0.30%) combined with 1% steel fibers were tested, focusing on the effects on concrete strength after thermal exposure. The behavior of the fresh and hardened concrete was assessed, ensuring uniform fiber distribution. Compression tests were conducted at 14 and 28 days, before and after heat exposure. Results indicate that 0.25% polypropylene and 1% steel fibers maintained compressive strength after heating, highlighting this dosage as the most effective. This suggests a key advance in designing fire-resistant concretes for safer, more durable structures.