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<p>In this study, the structural behavior of slender reinforced hybrid self-compacting concrete (SC-HC) columns with reactive powder concrete (RPC) outer shell under uniaxial eccentric loading is investigated experimentally. Six full-scale square-section specimens (140 × 140&#xa0;mm, 1260&#xa0;mm in height) were tested under medium and high eccentricity ratios (e/h = 0.65 and e/h = 0.9). Hybrid specimens consisted in a self-compacting reactive powder concrete (SC-RPC) outer shell around a self-compacting normal strength concrete (SC-NSC) core. The selected columns were retrofitted externally by Near Surface Mounted GFRP (NSM GFRP) bars with CFRP strips. The axial load-carrying capacity and flexural moment capacity (by up to 47% and 56%, respectively) were significantly enhanced by replacing the outer shells with reactive powder concrete (RPC), according to the experimental results. It was also found that NSM strengthened specimen was having 80% higher axial load capacity and more than 100% higher moment capacity than that of the control specimen without strengthening. The key response parameters including lateral deflection, strain profiles, moment–curvature relationships, and ductility were carefully examined. The results confirm that RPC shells and NSM strengthening are effective for enhancing the strength and ductility of long hybrid SCC columns with large eccentricity.</p>

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Structural behavior of slender hybrid self-compacting concrete columns with RPC shells and NSM technique

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Alaa Ali Salman Al-Taai,
  • Waleed A. Waryosh

摘要

In this study, the structural behavior of slender reinforced hybrid self-compacting concrete (SC-HC) columns with reactive powder concrete (RPC) outer shell under uniaxial eccentric loading is investigated experimentally. Six full-scale square-section specimens (140 × 140 mm, 1260 mm in height) were tested under medium and high eccentricity ratios (e/h = 0.65 and e/h = 0.9). Hybrid specimens consisted in a self-compacting reactive powder concrete (SC-RPC) outer shell around a self-compacting normal strength concrete (SC-NSC) core. The selected columns were retrofitted externally by Near Surface Mounted GFRP (NSM GFRP) bars with CFRP strips. The axial load-carrying capacity and flexural moment capacity (by up to 47% and 56%, respectively) were significantly enhanced by replacing the outer shells with reactive powder concrete (RPC), according to the experimental results. It was also found that NSM strengthened specimen was having 80% higher axial load capacity and more than 100% higher moment capacity than that of the control specimen without strengthening. The key response parameters including lateral deflection, strain profiles, moment–curvature relationships, and ductility were carefully examined. The results confirm that RPC shells and NSM strengthening are effective for enhancing the strength and ductility of long hybrid SCC columns with large eccentricity.