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<p>This study investigates the axial load-carrying capacity of fiber-reinforced polymer-confined columns made with the geopolymer (GPC) and ordinary Portland cement (OPC) incorporating both natural and recycled aggregates. The analysis covers normal-strength, high-strength, and ultra-high-strength concretes (NSC, HSC, UHSC) under axial compression, using data from extensive experimental results (1381 specimens reported by researches) in the literature. Six international design codes, including ACI PRC-440.2, CAN/CSA-S06, CAN/CSA-S806, fib Bulletin 90, CNR-DT 200, and NCHRP Report 655, were assessed, revealing that fib Bulletin 90 provides the most accurate predictions, while others consistently underestimate axial load capacity due to conservative assumptions. In addition to recognized design codes, formulas proposed by researchers were also evaluated against the collected experimental data. While predictive models show strong alignment with experimental results for NSC concretes, including OPC and GPC, made with either natural or recycled aggregates, their accuracy for HSC and UHSC should be improved. To address these gaps, this study presents modified formulations based on existing models and extensive test data, delivering enhanced precision for a broader range of concretes.</p>

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Compressive Load Capacity of FRP-Confined Geopolymer and Cement Concrete: Experimental Data and Analytical Assessment

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Ali Hoseinzadeh,
  • Alireza Khaloo

摘要

This study investigates the axial load-carrying capacity of fiber-reinforced polymer-confined columns made with the geopolymer (GPC) and ordinary Portland cement (OPC) incorporating both natural and recycled aggregates. The analysis covers normal-strength, high-strength, and ultra-high-strength concretes (NSC, HSC, UHSC) under axial compression, using data from extensive experimental results (1381 specimens reported by researches) in the literature. Six international design codes, including ACI PRC-440.2, CAN/CSA-S06, CAN/CSA-S806, fib Bulletin 90, CNR-DT 200, and NCHRP Report 655, were assessed, revealing that fib Bulletin 90 provides the most accurate predictions, while others consistently underestimate axial load capacity due to conservative assumptions. In addition to recognized design codes, formulas proposed by researchers were also evaluated against the collected experimental data. While predictive models show strong alignment with experimental results for NSC concretes, including OPC and GPC, made with either natural or recycled aggregates, their accuracy for HSC and UHSC should be improved. To address these gaps, this study presents modified formulations based on existing models and extensive test data, delivering enhanced precision for a broader range of concretes.