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<p>This research conducts an in-depth parametric study on hybrid glass fibre-reinforced geopolymer concrete (HGFR-GPC), examining how variations in fibre length and dosage impact performance. A total of 21 different mixes were formulated using glass fibres of four lengths (3&#xa0;mm, 6&#xa0;mm, 12&#xa0;mm, and 24&#xa0;mm) combined in pairs and applied at three levels of fibre dosages (1.0%, 1.5%, and 2.0% by binder weight). Each mix was tested for fresh properties, mechanical strength, and durability indicators. Findings revealed that the effects of fibre length and dosage are non-linear, with some combinations improving strength and durability synergistically, while others leading to reduced workability or greater shrinkage. For instance, the optimal hybrid blend B-6-12 (6&#xa0;mm + 12&#xa0;mm fibres at 1.5% dosage) achieved a flexural strength of 5.26&#xa0;MPa and a split tensile strength of 8.89&#xa0;MPa, while demonstrating reduced chloride ion penetration (1095 Coulombs) and carbonation depth (25&#xa0;mm). Results of ANOVA analysis also confirmed that the hybridization and the fibre dosage significantly alter the overall blend’s performance. Lastly, to systematically assess overall performance, a multi-criteria decision-making (MCDM) method was employed, confirming the B-6-12 mix as the most efficient in balancing strength, durability, and workability.</p>

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Optimization of Hybrid Glass Fibre-Reinforced Geopolymer Concrete: A Multi-criteria Evaluation of Fibre Lengths

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Anil Kumar,
  • Pradeep Kumar Ghosh,
  • Ravindra Sharma,
  • Vivek Pahuja

摘要

This research conducts an in-depth parametric study on hybrid glass fibre-reinforced geopolymer concrete (HGFR-GPC), examining how variations in fibre length and dosage impact performance. A total of 21 different mixes were formulated using glass fibres of four lengths (3 mm, 6 mm, 12 mm, and 24 mm) combined in pairs and applied at three levels of fibre dosages (1.0%, 1.5%, and 2.0% by binder weight). Each mix was tested for fresh properties, mechanical strength, and durability indicators. Findings revealed that the effects of fibre length and dosage are non-linear, with some combinations improving strength and durability synergistically, while others leading to reduced workability or greater shrinkage. For instance, the optimal hybrid blend B-6-12 (6 mm + 12 mm fibres at 1.5% dosage) achieved a flexural strength of 5.26 MPa and a split tensile strength of 8.89 MPa, while demonstrating reduced chloride ion penetration (1095 Coulombs) and carbonation depth (25 mm). Results of ANOVA analysis also confirmed that the hybridization and the fibre dosage significantly alter the overall blend’s performance. Lastly, to systematically assess overall performance, a multi-criteria decision-making (MCDM) method was employed, confirming the B-6-12 mix as the most efficient in balancing strength, durability, and workability.