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This paper aims to analyze concrete paving blocks (CPB) with construction and demolition waste (CDW) and coconut fibers (CF) for light traffic road pavements, applying physical and mechanical characterization. Therefore, nine mixtures, three without by-products, three with CDW recycled materials, and three with CF, were used to produce rectangular CPB 20 cm × 10 cm × 8 cm (length × width × thickness). Tests, such as water absorption, air void, and compressive strength at 7 and 28 days, were done on CPB. The results showed that the mix with CDW materials, 75CDW-0.73, presented CPB at 28 days with the lowest average air void of 11.88%, demonstrating the significant compactness by the jackhammer in mixing recycled aggregates with the water/cement ratio of 0.73. Furthermore, the mixtures REF-0.63F and REF-0.73 presented CPB at 28 days with a characteristic compressive strength 139.33% and 148.42% higher than the mix REF-0.63, being a positive effect of CF and water for the mixtures’ workability. Also, the mixtures REF-0.73 and 75CDW-0.73 showed average water absorption below the Brazilian and European specifications of 6%. Finally, the CPB application with by-products is possible for light traffic according to the Australian specification for bike paths or parking areas.

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Feasibility of Concrete Paving Blocks Produced with By-Products from Construction and Coconut Industries

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年

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  • Webert Silva,
  • Luís Picado-Santos,
  • Suelly Barroso,
  • Antônio Eduardo Cabral,
  • Ronaldo Stefanutti

摘要

This paper aims to analyze concrete paving blocks (CPB) with construction and demolition waste (CDW) and coconut fibers (CF) for light traffic road pavements, applying physical and mechanical characterization. Therefore, nine mixtures, three without by-products, three with CDW recycled materials, and three with CF, were used to produce rectangular CPB 20 cm × 10 cm × 8 cm (length × width × thickness). Tests, such as water absorption, air void, and compressive strength at 7 and 28 days, were done on CPB. The results showed that the mix with CDW materials, 75CDW-0.73, presented CPB at 28 days with the lowest average air void of 11.88%, demonstrating the significant compactness by the jackhammer in mixing recycled aggregates with the water/cement ratio of 0.73. Furthermore, the mixtures REF-0.63F and REF-0.73 presented CPB at 28 days with a characteristic compressive strength 139.33% and 148.42% higher than the mix REF-0.63, being a positive effect of CF and water for the mixtures’ workability. Also, the mixtures REF-0.73 and 75CDW-0.73 showed average water absorption below the Brazilian and European specifications of 6%. Finally, the CPB application with by-products is possible for light traffic according to the Australian specification for bike paths or parking areas.