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<p>The escalating environmental concerns associated with plastic waste and the high carbon footprint of cement production have exposed significant gaps in sustainable construction practices. To this end, this paper aims to investigate the physico-mechanical properties of geopolymer concrete incorporating polyethylene-terephthalate (PET) and polypropylene (PP) as partial replacements for coarse aggregates, offering a promising solution for reducing environmental pollution and promoting eco-friendly engineering practices. The fly ash-based geopolymer was activated using 10&#xa0;M sodium hydroxide (NaOH) and 3% wt sodium silicate (Na₂SiO₃), with samples cured at 80&#xa0;°C for 24&#xa0;h and under ambient conditions. The study revealed that the compressive strength for oven and air-cured concrete was in the range of 15.3–24.6&#xa0;MPa, and 15.64–21.3&#xa0;MPa while plastic geopolymer concrete with 3.25% PET and 1.25% PP exhibited the highest maximum compressive strength of 24.6&#xa0;MPa and 21.3&#xa0;MPa. This study concludes that incorporating plastic into concrete enhances its strength while also promoting sustainability.</p>

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Physico-mechanical and microstructural properties of plastic geopolymer composite

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Jude Omotosho,
  • Adekunle Adeleke,
  • Hauwa A. Rasheed,
  • Chukwuma C. Ogbaga,
  • Abdulganiyu Sanusi,
  • Seun Jesuloluwa,
  • Yusuf Kudu

摘要

The escalating environmental concerns associated with plastic waste and the high carbon footprint of cement production have exposed significant gaps in sustainable construction practices. To this end, this paper aims to investigate the physico-mechanical properties of geopolymer concrete incorporating polyethylene-terephthalate (PET) and polypropylene (PP) as partial replacements for coarse aggregates, offering a promising solution for reducing environmental pollution and promoting eco-friendly engineering practices. The fly ash-based geopolymer was activated using 10 M sodium hydroxide (NaOH) and 3% wt sodium silicate (Na₂SiO₃), with samples cured at 80 °C for 24 h and under ambient conditions. The study revealed that the compressive strength for oven and air-cured concrete was in the range of 15.3–24.6 MPa, and 15.64–21.3 MPa while plastic geopolymer concrete with 3.25% PET and 1.25% PP exhibited the highest maximum compressive strength of 24.6 MPa and 21.3 MPa. This study concludes that incorporating plastic into concrete enhances its strength while also promoting sustainability.