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<p>This study investigates the sustainable use of recycled plastic waste aggregates (PWA)—specifically polyethylene terephthalate (PET) and polyvinyl chloride (PVC) as partial replacements for natural aggregates in high-strength concrete (HSC) with a target compressive strength of about 65&#xa0;MPa. Four types of PWA, including mixed irregular-shaped plastic waste particles, PVC, heat-treated pellets (PEL), and PET, were added into concrete mixes at replacement levels of 5%, 10%, 15%, and 20%. Extensive experiments assessed the mechanical, durability, and ultrasonic properties of these aggregates, such as compressive strength, flexural strength, ultrasonic pulse velocity (UPV), and surface area. Results showed a gradual decline in compressive and flexural strengths as PWA content increased, with the extent depending on the type and shape of the plastic aggregates. The remaining mechanical properties were strongly influenced by the chemical composition, density, shape, and grading of the PWA, which in turn affect interfacial bond behavior. Among all types, the Mixed PWA caused the greatest strength loss and absorption, while also lowering density. The small decrease in UPV indicated that the elastic modulus of PWA plays a significant role in cracking behavior under stress. Moreover, adding silica fume (SF) effectively reduced strength loss in HSC mixes containing Mixed and PEL PWAs. Statistical analysis revealed that accurately predicting compressive strength requires accounting for the shape and size of PWA particles, with the aggregate surface area being an important variable in regression-based models. These results show that PWA shape significantly impacts mechanical performance and that SF’s effectiveness depends on PWA type. The surface area-based modeling method provides a reliable tool for designing sustainable HSC with various plastic waste material streams.</p>

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Influence of plastic waste aggregate morphology on the mechanical properties of high-strength concrete: a sustainable approach with predictive modeling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月15日

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  • Azad A. Mohammed,
  • Frya S. Jafr,
  • Ahmed Salih Mohammed

摘要

This study investigates the sustainable use of recycled plastic waste aggregates (PWA)—specifically polyethylene terephthalate (PET) and polyvinyl chloride (PVC) as partial replacements for natural aggregates in high-strength concrete (HSC) with a target compressive strength of about 65 MPa. Four types of PWA, including mixed irregular-shaped plastic waste particles, PVC, heat-treated pellets (PEL), and PET, were added into concrete mixes at replacement levels of 5%, 10%, 15%, and 20%. Extensive experiments assessed the mechanical, durability, and ultrasonic properties of these aggregates, such as compressive strength, flexural strength, ultrasonic pulse velocity (UPV), and surface area. Results showed a gradual decline in compressive and flexural strengths as PWA content increased, with the extent depending on the type and shape of the plastic aggregates. The remaining mechanical properties were strongly influenced by the chemical composition, density, shape, and grading of the PWA, which in turn affect interfacial bond behavior. Among all types, the Mixed PWA caused the greatest strength loss and absorption, while also lowering density. The small decrease in UPV indicated that the elastic modulus of PWA plays a significant role in cracking behavior under stress. Moreover, adding silica fume (SF) effectively reduced strength loss in HSC mixes containing Mixed and PEL PWAs. Statistical analysis revealed that accurately predicting compressive strength requires accounting for the shape and size of PWA particles, with the aggregate surface area being an important variable in regression-based models. These results show that PWA shape significantly impacts mechanical performance and that SF’s effectiveness depends on PWA type. The surface area-based modeling method provides a reliable tool for designing sustainable HSC with various plastic waste material streams.