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This study investigates the integration of recycled concrete aggregate (RCA) in landfill cover systems as a sustainable alternative to natural aggregates. The research primarily examines the interaction of RCA with geomembranes by determining the interface friction angle between RCA drainage layers and geomembranes through large-scale direct shear testing. A Finite Element Method (FEM) model of a municipal solid waste landfill in Este, Italy, was developed and validated against the analytical two-wedge theory for veneer shear failure in layered systems. The results demonstrate that RCA outperforms traditional aggregates as a drainage layer material. It also highlights the limitations of commercial FEM software in identifying weak interfaces in landfill cover systems.

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Performance Evaluation of Recycled Concrete Aggregates as Drainage Material in Combination with Geosynthetics for Landfill Cover Systems

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年

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  • Sayeeda Syed,
  • Anumita Mishra

摘要

This study investigates the integration of recycled concrete aggregate (RCA) in landfill cover systems as a sustainable alternative to natural aggregates. The research primarily examines the interaction of RCA with geomembranes by determining the interface friction angle between RCA drainage layers and geomembranes through large-scale direct shear testing. A Finite Element Method (FEM) model of a municipal solid waste landfill in Este, Italy, was developed and validated against the analytical two-wedge theory for veneer shear failure in layered systems. The results demonstrate that RCA outperforms traditional aggregates as a drainage layer material. It also highlights the limitations of commercial FEM software in identifying weak interfaces in landfill cover systems.