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<p>The depletion of natural aggregates and high carbon emissions from cement production necessitate the development of sustainable concrete alternatives. This study investigates the mechanical performance of concrete incorporating 20% rice husk ash (RHA) as a partial cement replacement and 20% recycled brick aggregate (RBA) as coarse aggregate replacement. To enhance the reduced strength typically associated with RHA–RBA-based concrete, three types of fibres, three forms of steel fibre (hooked-end, crimped, and straight), glass fibre (GF), and polypropylene fibre (PPF), were incorporated at varying dosages. The objective was to evaluate and compare the performance of these fibre-reinforced mixes in terms of compressive, flexural, and split tensile strength. The mix incorporating hooked-end steel fibre (HSF) at 1.0% dosage exhibited the most significant improvement, outperforming mixes reinforced with GF and PPF. The superior performance of HSF is attributed to its enhanced crack-bridging capability and mechanical interlocking effect within the concrete matrix. The findings suggest that RHA–RBA concrete reinforced with HSF can serve as a structurally viable and more sustainable alternative to conventional concrete. This approach offers potential applications in low- to mid-rise structural elements where resource conservation and strength are both critical.</p>

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Mechanical performance of fiber reinforced concrete incorporating rice husk ash and brick aggregate

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Pramod Kumar,
  • Rajnikant Upadhyay,
  • Keshav Kumar Sharma,
  • Seeram Madhuri,
  • Abhilash Gogineni,
  • Prem Kumar Vagestan

摘要

The depletion of natural aggregates and high carbon emissions from cement production necessitate the development of sustainable concrete alternatives. This study investigates the mechanical performance of concrete incorporating 20% rice husk ash (RHA) as a partial cement replacement and 20% recycled brick aggregate (RBA) as coarse aggregate replacement. To enhance the reduced strength typically associated with RHA–RBA-based concrete, three types of fibres, three forms of steel fibre (hooked-end, crimped, and straight), glass fibre (GF), and polypropylene fibre (PPF), were incorporated at varying dosages. The objective was to evaluate and compare the performance of these fibre-reinforced mixes in terms of compressive, flexural, and split tensile strength. The mix incorporating hooked-end steel fibre (HSF) at 1.0% dosage exhibited the most significant improvement, outperforming mixes reinforced with GF and PPF. The superior performance of HSF is attributed to its enhanced crack-bridging capability and mechanical interlocking effect within the concrete matrix. The findings suggest that RHA–RBA concrete reinforced with HSF can serve as a structurally viable and more sustainable alternative to conventional concrete. This approach offers potential applications in low- to mid-rise structural elements where resource conservation and strength are both critical.