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<p>Most early investigations focused on material or tendon-reinforced structures. Tendon-enhanced concrete structural members using fibers and nanoparticles have not been studied. Infrastructure development has made structural strengthening in reinforced concrete beams crucial. This study examines how external tendons improve reinforced concrete (RC) beam flexural strength. The research focuses on finding the right amounts of Nano-silica (NS) and Macro polypropylene fiber (MPF). Two-point loading failure tests were performed on eight 150 × 250&#xa0;mm and 2000&#xa0;mm RC beams. Ideal NS proportions of 3% as a cement substitute and MPF volume fraction of 0.5% were studied. These proportions were based on the biggest concrete property upgrades. In the investigation, tendon-strengthened beams were used. Tendon strengthening and NS/MPF presence classified the beam specimens into two groups: unstrengthened and strengthened. One beam in each group was a control beam, while the other three were strengthened with 3% NS, 0.5% MPF, or both. External tendon greatly increased RC beam flexural strength. Strength increased by 32.5–43.5% after strengthening. This strengthening also reduced final deflection. Ultimate deflection decreased by 11.6–47.9%. Group beams reinforced with NS and MPF exhibited a small and considerable influence on ultimate strength and deflection when unstrengthened. The final strength was 4.2–17.3% and the ultimate deflection decrease was 8.5–38.7%. NS and MPF also improved concrete mechanical qualities compared to controls.</p>

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Experimental study on strengthening reinforced concrete beams incorporating NanoSilica and polypropylene fiber with external tendons

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Araz Ali Mohammed,
  • Najmadeen Mohammed Saeed

摘要

Most early investigations focused on material or tendon-reinforced structures. Tendon-enhanced concrete structural members using fibers and nanoparticles have not been studied. Infrastructure development has made structural strengthening in reinforced concrete beams crucial. This study examines how external tendons improve reinforced concrete (RC) beam flexural strength. The research focuses on finding the right amounts of Nano-silica (NS) and Macro polypropylene fiber (MPF). Two-point loading failure tests were performed on eight 150 × 250 mm and 2000 mm RC beams. Ideal NS proportions of 3% as a cement substitute and MPF volume fraction of 0.5% were studied. These proportions were based on the biggest concrete property upgrades. In the investigation, tendon-strengthened beams were used. Tendon strengthening and NS/MPF presence classified the beam specimens into two groups: unstrengthened and strengthened. One beam in each group was a control beam, while the other three were strengthened with 3% NS, 0.5% MPF, or both. External tendon greatly increased RC beam flexural strength. Strength increased by 32.5–43.5% after strengthening. This strengthening also reduced final deflection. Ultimate deflection decreased by 11.6–47.9%. Group beams reinforced with NS and MPF exhibited a small and considerable influence on ultimate strength and deflection when unstrengthened. The final strength was 4.2–17.3% and the ultimate deflection decrease was 8.5–38.7%. NS and MPF also improved concrete mechanical qualities compared to controls.