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<p>This study evaluates the structural feasibility of using shredded plastic waste remnant (SPWR) as a partial replacement for fine aggregate in conventional reinforced concrete (RC) beams. Unlike previous studies limited to mortar or small-scale specimens, this research investigates full-scale reinforced concrete beams using locally sourced SPWR from Ghanaian waste streams under realistic flexural loading conditions. Concrete mixes were prepared with SPWR replacement levels of 0 to 25% at a constant water to cement ratio of 0.50. Fresh and hardened properties including workability, density, compressive strength, splitting tensile strength, water absorption, and flexural strength were evaluated alongside full-scale beam behavior. Results show that mechanical performance is maintained up to 10% SPWR replacement, with 28-day compressive strength reaching 25.16&#xa0;MPa and flexural strength remaining within 11.6% of the control mix. Beam tests revealed comparable structural performance, with average failure loads of 57.33 kN for SPWR beams and 56.00 kN for control beams, indicating a variation of less than 3%. However, higher replacement levels resulted in significant strength reductions due to weakened interfacial bonding. The study demonstrates that SPWR can be safely incorporated in structural concrete at controlled levels up to 10% without compromising structural integrity. This work provides a structural-scale experimental basis for the utilization of locally sourced plastic waste in reinforced concrete, contributing to sustainable construction and circular economy practices.</p>

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The impact of shredded plastic waste remnant on the properties of reinforced concrete beams

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月12日

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  • Russell Owusu Afrifa,
  • Sampson Assiamah,
  • Isaac Akwei,
  • Simon Ayernor Tetteh

摘要

This study evaluates the structural feasibility of using shredded plastic waste remnant (SPWR) as a partial replacement for fine aggregate in conventional reinforced concrete (RC) beams. Unlike previous studies limited to mortar or small-scale specimens, this research investigates full-scale reinforced concrete beams using locally sourced SPWR from Ghanaian waste streams under realistic flexural loading conditions. Concrete mixes were prepared with SPWR replacement levels of 0 to 25% at a constant water to cement ratio of 0.50. Fresh and hardened properties including workability, density, compressive strength, splitting tensile strength, water absorption, and flexural strength were evaluated alongside full-scale beam behavior. Results show that mechanical performance is maintained up to 10% SPWR replacement, with 28-day compressive strength reaching 25.16 MPa and flexural strength remaining within 11.6% of the control mix. Beam tests revealed comparable structural performance, with average failure loads of 57.33 kN for SPWR beams and 56.00 kN for control beams, indicating a variation of less than 3%. However, higher replacement levels resulted in significant strength reductions due to weakened interfacial bonding. The study demonstrates that SPWR can be safely incorporated in structural concrete at controlled levels up to 10% without compromising structural integrity. This work provides a structural-scale experimental basis for the utilization of locally sourced plastic waste in reinforced concrete, contributing to sustainable construction and circular economy practices.