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This study aims to explore the utilization of polyethylene terephthalate (PET), high-density polyethylene (HDPE), polypropylene (PP), and a composite of these plastic wastes (PET, HDPE, and PP) as a 3% volume replacement for sand. A sand-cement ratio of 3:1 (control) was compared against alternative treatments. The findings revealed that the mixed plastic sand brick (PET, HDPE, and PP mixture) exhibited the highest compressive strength at 10.311 MPa, representing a 26.17% increase compared to the control sand brick with the lowest strength at 8.172 MPa. Additionally, the PET sand brick demonstrated the lowest water absorption rate at 8.53%, which was 1.209% lower than the control’s absorption rate of 9.739%. Conversely, the HDPE sand brick displayed a higher water absorption rate of 9.993% compared to the control, indicating a 2.61% increase over the control sand brick’s absorption rate of 9.739%. The efflorescence, color, and structure tests met the required standards for construction-grade bricks. This study yielded positive outcomes by substituting a small portion of sand with plastic due to challenges in effectively binding with the cement paste.

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Utilization of Plastic Waste to Produce Eco-Bricks in Building Construction

  • 会议论文

  • 发表日期：

    2026年

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  • Robberta Renuka Lazarus,
  • Rosazlin Abdullah,
  • Huzaifa Hashim,
  • Norhanim Zakaria

摘要

This study aims to explore the utilization of polyethylene terephthalate (PET), high-density polyethylene (HDPE), polypropylene (PP), and a composite of these plastic wastes (PET, HDPE, and PP) as a 3% volume replacement for sand. A sand-cement ratio of 3:1 (control) was compared against alternative treatments. The findings revealed that the mixed plastic sand brick (PET, HDPE, and PP mixture) exhibited the highest compressive strength at 10.311 MPa, representing a 26.17% increase compared to the control sand brick with the lowest strength at 8.172 MPa. Additionally, the PET sand brick demonstrated the lowest water absorption rate at 8.53%, which was 1.209% lower than the control’s absorption rate of 9.739%. Conversely, the HDPE sand brick displayed a higher water absorption rate of 9.993% compared to the control, indicating a 2.61% increase over the control sand brick’s absorption rate of 9.739%. The efflorescence, color, and structure tests met the required standards for construction-grade bricks. This study yielded positive outcomes by substituting a small portion of sand with plastic due to challenges in effectively binding with the cement paste.