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<p>Concrete, a major contributor to CO₂ emissions, is the most widely used construction material because of its high strength and durability. This study investigates the influence of High-Density Polyethylene (HDPE) plastic as a partial substitute for coarse aggregates and Silica Fume (SF) as a supplementary cementitious material on concrete’s mechanical properties and fire performance. For this purpose, several concrete mixes were prepared by replacing coarse aggregates with 8% and 15% of HDPE and replacing cement with 15% and 25% of SF. The workability, density, compressive strength, split tensile strength, and fire resistance test values were obtained by the applicable ASTM standards before and after exposure to 500&#xa0;°C for one hour. Results showed decreased density and compressive strength with the addition of HDPE, with S15P15 and S25P15 exhibiting the most significant strength loss up to 40% and 69.7% respectively. The fresh and dry densities were reduced by up to 12% and 15%, respectively, in high-HDPE mixes. Higher HDPE content results in greater mass loss (9.27%) during a fire endurance test. However, the addition of SF reduces thermal degradation. SF improved strength retention and enhanced the fire performance of the HDPE-modified concrete with S15P8 showing the best post-fire strength with the lowest compressive strength loss (32.4%) and the highest relative residual strength (67.8% compressive and 78.2% tensile). Future investigations should delve into the implementations of advanced fire-retardant additives or the optimization of the ratios of HDPE to SF to improve their post-fire performance.</p>

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Fire-resistant and eco-friendly concrete: investigating HDPE plastic and silica fume as partial replacements

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Muhammad Shahrukh Pasha,
  • Muhammad Fahim Aslam,
  • Mohammad Hamza,
  • Muhammad Bilal,
  • Maisam Tammar,
  • Faisal Khan

摘要

Concrete, a major contributor to CO₂ emissions, is the most widely used construction material because of its high strength and durability. This study investigates the influence of High-Density Polyethylene (HDPE) plastic as a partial substitute for coarse aggregates and Silica Fume (SF) as a supplementary cementitious material on concrete’s mechanical properties and fire performance. For this purpose, several concrete mixes were prepared by replacing coarse aggregates with 8% and 15% of HDPE and replacing cement with 15% and 25% of SF. The workability, density, compressive strength, split tensile strength, and fire resistance test values were obtained by the applicable ASTM standards before and after exposure to 500 °C for one hour. Results showed decreased density and compressive strength with the addition of HDPE, with S15P15 and S25P15 exhibiting the most significant strength loss up to 40% and 69.7% respectively. The fresh and dry densities were reduced by up to 12% and 15%, respectively, in high-HDPE mixes. Higher HDPE content results in greater mass loss (9.27%) during a fire endurance test. However, the addition of SF reduces thermal degradation. SF improved strength retention and enhanced the fire performance of the HDPE-modified concrete with S15P8 showing the best post-fire strength with the lowest compressive strength loss (32.4%) and the highest relative residual strength (67.8% compressive and 78.2% tensile). Future investigations should delve into the implementations of advanced fire-retardant additives or the optimization of the ratios of HDPE to SF to improve their post-fire performance.