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<p>This study presents the development and characterisation of rectangular paver blocks fabricated from recycled polyethylene terephthalate (PET) and wheat straw. The work aims to utilise post-consumer plastic and agricultural residue as an alternative to cement-based paving materials. Five compositions were prepared by varying the wheat straw content from 0 to 40% by weight. The specimens were tested for density, water absorption and compressive strength, fractography and field emission scanning electron microscopy (FESEM) analysis to understand failure behaviour and microstructural features. The density decreased with increase straw content due to the lower intrinsic density of straw and the formation of micro-voids caused by incomplete wetting. Water absorption remained very low in pure PET and increased sharply beyond 20% wheat straw, governed by the hydrophilic nature of lignocellulosic fibres and internal porosity. The highest compressive strength (4.17&#xa0;MPa) was recorded for 100% PET, whereas a strength of 3.42&#xa0;MPa was achieved at 20% straw loading. Excessive straw addition produced weak interfacial bonding, fibre pull-out and premature failure. The results indicate that recycled PET can serve as an effective binder, and the incorporation of wheat straw up to 20% provides a sustainable, low-cost composite for non-traffic paving applications.</p>

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Valorization of Recycled Polyethylene Terephthalate and Wheat Straw for Sustainable Composite Paver Blocks: Mechanical Performance and Microstructural Insights

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Sonal Singh,
  • Mansingh Rathore,
  • Deepak Kumar Prajapat,
  • Manish Singh,
  • Yashpal,
  • Suresh Gain

摘要

This study presents the development and characterisation of rectangular paver blocks fabricated from recycled polyethylene terephthalate (PET) and wheat straw. The work aims to utilise post-consumer plastic and agricultural residue as an alternative to cement-based paving materials. Five compositions were prepared by varying the wheat straw content from 0 to 40% by weight. The specimens were tested for density, water absorption and compressive strength, fractography and field emission scanning electron microscopy (FESEM) analysis to understand failure behaviour and microstructural features. The density decreased with increase straw content due to the lower intrinsic density of straw and the formation of micro-voids caused by incomplete wetting. Water absorption remained very low in pure PET and increased sharply beyond 20% wheat straw, governed by the hydrophilic nature of lignocellulosic fibres and internal porosity. The highest compressive strength (4.17 MPa) was recorded for 100% PET, whereas a strength of 3.42 MPa was achieved at 20% straw loading. Excessive straw addition produced weak interfacial bonding, fibre pull-out and premature failure. The results indicate that recycled PET can serve as an effective binder, and the incorporation of wheat straw up to 20% provides a sustainable, low-cost composite for non-traffic paving applications.