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<p>The growing challenge of managing plastic and glass waste, alongside the demand for resilient pavements, has accelerated interest in sustainable asphalt technologies. This study evaluates the use of waste low‑density polyethylene (LDPE) as a binder modifier and crushed glass cullets as aggregate replacement in hot mix asphalt (HMA). Laboratory testing demonstrated that incorporating 4% LDPE and 10% glass increased the resilient modulus by 78% compared to conventional HMA, while moisture resistance improved by 17%, indicating superior stiffness and durability. A case study on a 2009 four‑lane highway section highlighted further sustainability gains, with the modified mix reducing bitumen consumption by 4%, natural aggregate demand by 10%, overall construction cost by 4.13%, and embodied CO₂ emissions by 12%, while diverting a significant portion of non‑biodegradable waste from landfills and reducing landfill space requirements by nearly 50% relative to the reference scenario. These findings confirm that LDPE–glass modified HMA offers a scalable, eco‑efficient pavement technology delivering a triple advantage of enhanced mechanical performance, measurable cost efficiency, and substantial environmental benefits, directly contributing to SDGs 9, 11, and 12 for sustainable infrastructure in developing regions.</p>

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Transforming Plastic and Glass Waste into High-Performance Hot Mix Asphalt Additives

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Muhammad Usman Khan,
  • Moiz Tariq

摘要

The growing challenge of managing plastic and glass waste, alongside the demand for resilient pavements, has accelerated interest in sustainable asphalt technologies. This study evaluates the use of waste low‑density polyethylene (LDPE) as a binder modifier and crushed glass cullets as aggregate replacement in hot mix asphalt (HMA). Laboratory testing demonstrated that incorporating 4% LDPE and 10% glass increased the resilient modulus by 78% compared to conventional HMA, while moisture resistance improved by 17%, indicating superior stiffness and durability. A case study on a 2009 four‑lane highway section highlighted further sustainability gains, with the modified mix reducing bitumen consumption by 4%, natural aggregate demand by 10%, overall construction cost by 4.13%, and embodied CO₂ emissions by 12%, while diverting a significant portion of non‑biodegradable waste from landfills and reducing landfill space requirements by nearly 50% relative to the reference scenario. These findings confirm that LDPE–glass modified HMA offers a scalable, eco‑efficient pavement technology delivering a triple advantage of enhanced mechanical performance, measurable cost efficiency, and substantial environmental benefits, directly contributing to SDGs 9, 11, and 12 for sustainable infrastructure in developing regions.