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<p>The increasing demand for sustainable and durable construction materials has positioned geopolymer concrete (GPC) as a promising alternative to traditional Portland cement-based concrete, owing to its lower carbon footprint and enhanced chemical stability. </p><p>This study systematically investigates the influence of steel fibre reinforcement and curing conditions on the mechanical and microstructural characteristics of GPC. Two distinct types of steel fibres, hooked-end steel fibres (HESF) and flat crimped steel fibres (FCSF), were incorporated at volume fractions of 0, 1, 2, and 3%. Results reveal a critical trade-off: while fibre addition reduces workability, FCSF retains better flow than HESF due to reduced mechanical interlocking. The specimens were subjected to ambient curing and oven curing at 80&#xa0;°C to evaluate the impact of thermal activation on geopolymerization and strength development. Oven curing results in increase in average compressive strength from 20.57 to 48.01&#xa0;MPa (a 133.4% increase) for the control mix compared to ambient curing. Among the reinforced specimens, those containing 3% HESF demonstrated the highest improvement, with 34% (from 48.01 to 64.38&#xa0;MPa) increase in average compressive strength and a 44% increase in split tensile strength relative to the oven-cured control. While compressive strength of 3% FCSF also improved from 48.01 to 60.58&#xa0;MPa, but the enhancements were less as compared to 3% HESF. Scanning electron microscopy (SEM) observations supported the mechanical results by showing a dense geopolymer matrix and strong fibre–matrix interfaces in the oven-cured specimens. A sensitivity analysis and linear regression (<i>R</i><sup>2</sup> &gt; 0.90) were also performed to assess the dependency of processing parameters on the final outcome.</p>

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Impact of Fibre Geometry and Curing Conditions on Mechanical and Microstructural Properties of Fibre Reinforced Geopolymer Concrete

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Vishal,
  • Vimal Kumar

摘要

The increasing demand for sustainable and durable construction materials has positioned geopolymer concrete (GPC) as a promising alternative to traditional Portland cement-based concrete, owing to its lower carbon footprint and enhanced chemical stability.

This study systematically investigates the influence of steel fibre reinforcement and curing conditions on the mechanical and microstructural characteristics of GPC. Two distinct types of steel fibres, hooked-end steel fibres (HESF) and flat crimped steel fibres (FCSF), were incorporated at volume fractions of 0, 1, 2, and 3%. Results reveal a critical trade-off: while fibre addition reduces workability, FCSF retains better flow than HESF due to reduced mechanical interlocking. The specimens were subjected to ambient curing and oven curing at 80 °C to evaluate the impact of thermal activation on geopolymerization and strength development. Oven curing results in increase in average compressive strength from 20.57 to 48.01 MPa (a 133.4% increase) for the control mix compared to ambient curing. Among the reinforced specimens, those containing 3% HESF demonstrated the highest improvement, with 34% (from 48.01 to 64.38 MPa) increase in average compressive strength and a 44% increase in split tensile strength relative to the oven-cured control. While compressive strength of 3% FCSF also improved from 48.01 to 60.58 MPa, but the enhancements were less as compared to 3% HESF. Scanning electron microscopy (SEM) observations supported the mechanical results by showing a dense geopolymer matrix and strong fibre–matrix interfaces in the oven-cured specimens. A sensitivity analysis and linear regression (R2 > 0.90) were also performed to assess the dependency of processing parameters on the final outcome.