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<p>Increasing scarcity of natural aggregates and the environmental impacts of their extraction have driven interest in use of construction and demolition (C&amp;D) waste as a sustainable alternative for pavement applications; however, its inferior mechanical properties require stabilization for effective use in base layers. This study presents large-scale model pavement experiments on natural aggregates and C&amp;D waste, with and without geogrid stabilization, to evaluate the feasibility of replacing natural aggregates. The experiments were conducted in a large-scale test chamber measuring 1.5&#xa0;m × 1.5&#xa0;m in plan, with natural aggregates and C&amp;D waste used as base materials over subgrades having California Bearing Ratio’s (CBR) of 3%, 5%, and 7%. Polyester (PET) geogrids with different tensile strengths (PET30, PET60, and PET100) were employed. The performance of unstabilized C&amp;D waste sections was first compared with natural aggregate sections using the Modulus Comparison Ratio (MCR), which ranged from 0.70 to 0.81. Subsequently, the performance of stabilized sections incorporating PET geogrids in the base layers of both C&amp;D waste and natural aggregates was evaluated in terms of the Modulus Improvement Factor (MIF). The stabilized C&amp;D waste base layers exhibited MIF values ranging from 1.32 to 3.50 over different subgrades. In addition, the inclusion of geogrids reduced surface deformation relative to natural aggregate, with a deformation ratio (DR) of 0.67, a reduction in subgrade contact pressure expressed by a subgrade stress ratio (SSR) of 0.52, and a reduction in subgrade deformation by a rut depth ratio (RDR) of 0.30, thereby demonstrating the potential of geogrid-stabilized C&amp;D waste as a sustainable alternative for pavement base layers.</p>

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Experimental Studies on PET Geogrid-Stabilized Recycled Concrete Aggregates as Unpaved Road Base Material under Monotonic Loading

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Shiva Prasad Barmavath,
  • Umashankar Balunaini

摘要

Increasing scarcity of natural aggregates and the environmental impacts of their extraction have driven interest in use of construction and demolition (C&D) waste as a sustainable alternative for pavement applications; however, its inferior mechanical properties require stabilization for effective use in base layers. This study presents large-scale model pavement experiments on natural aggregates and C&D waste, with and without geogrid stabilization, to evaluate the feasibility of replacing natural aggregates. The experiments were conducted in a large-scale test chamber measuring 1.5 m × 1.5 m in plan, with natural aggregates and C&D waste used as base materials over subgrades having California Bearing Ratio’s (CBR) of 3%, 5%, and 7%. Polyester (PET) geogrids with different tensile strengths (PET30, PET60, and PET100) were employed. The performance of unstabilized C&D waste sections was first compared with natural aggregate sections using the Modulus Comparison Ratio (MCR), which ranged from 0.70 to 0.81. Subsequently, the performance of stabilized sections incorporating PET geogrids in the base layers of both C&D waste and natural aggregates was evaluated in terms of the Modulus Improvement Factor (MIF). The stabilized C&D waste base layers exhibited MIF values ranging from 1.32 to 3.50 over different subgrades. In addition, the inclusion of geogrids reduced surface deformation relative to natural aggregate, with a deformation ratio (DR) of 0.67, a reduction in subgrade contact pressure expressed by a subgrade stress ratio (SSR) of 0.52, and a reduction in subgrade deformation by a rut depth ratio (RDR) of 0.30, thereby demonstrating the potential of geogrid-stabilized C&D waste as a sustainable alternative for pavement base layers.