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<p>Portland cement is responsible for a large share of CO<sub>2</sub> emissions in the construction sector, which reinforces the need for sustainable alternatives. In this context, wastes with pozzolanic properties, such as red ceramic waste (RCW), show potential for partial replacement of cement. Every year, dozens of tons of RCW are generated, usually disposed of in landfills or discarded improperly, causing environmental impacts. This study investigated the replacement of 10 and 25% of Portland cement with RCW in concrete. The research introduces innovation by evaluating the performance of the mixtures under elevated temperatures (200, 400, and 600&#xa0;°C) and conducting a life cycle assessment (LCA) of the developed composites, aspects rarely addressed in the literature. The results showed that the concrete with 10% RCW exhibited higher compressive strength than both the 25% mixture and the control concrete after exposure to 400 and 600&#xa0;°C. The elastic modulus of the RCW10% mix also stood out, reaching 37.3&#xa0;MPa, outperforming all other concretes at all studied temperatures. The LCA demonstrated reductions in CO<sub>2</sub> emissions of approximately 9 and 23% for RCW10% and RCW25%, respectively, with additional reductions in the categories of Marine Eutrophication (6 and 16%) and Terrestrial Acidification (8 and 19%) compared to the control concrete.</p>

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Effects of red ceramic waste on the thermomechanical properties of concrete and its life cycle assessment

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Aldo Ribeiro de Carvalho,
  • Marcela Martins Carrara,
  • Gabriela dos Santos Pacífico,
  • Beatriz Leite Sefair de Barros,
  • Leucino Caldeira,
  • Thaís Mayra de Oliveira

摘要

Portland cement is responsible for a large share of CO2 emissions in the construction sector, which reinforces the need for sustainable alternatives. In this context, wastes with pozzolanic properties, such as red ceramic waste (RCW), show potential for partial replacement of cement. Every year, dozens of tons of RCW are generated, usually disposed of in landfills or discarded improperly, causing environmental impacts. This study investigated the replacement of 10 and 25% of Portland cement with RCW in concrete. The research introduces innovation by evaluating the performance of the mixtures under elevated temperatures (200, 400, and 600 °C) and conducting a life cycle assessment (LCA) of the developed composites, aspects rarely addressed in the literature. The results showed that the concrete with 10% RCW exhibited higher compressive strength than both the 25% mixture and the control concrete after exposure to 400 and 600 °C. The elastic modulus of the RCW10% mix also stood out, reaching 37.3 MPa, outperforming all other concretes at all studied temperatures. The LCA demonstrated reductions in CO2 emissions of approximately 9 and 23% for RCW10% and RCW25%, respectively, with additional reductions in the categories of Marine Eutrophication (6 and 16%) and Terrestrial Acidification (8 and 19%) compared to the control concrete.