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<p>This study aims to overcome the limitations of expanded polystyrene (EPS) in geopolymer concrete, namely its hydrophobicity nature and low strength issues. A novel secondary coating process was employed to develop geopolymer-EPS core–shell lightweight aggregates (CSLAs) using industrial by-products such as fly ash, slag, carbide slag, and glauber’s salt, with the goal of enhancing the performance of geopolymer concrete. The main research findings reveal that, in comparison with EPS geopolymer concrete, the compressive strength of CSLA geopolymer concrete is significantly improved (with an increase of 57.93%), and there are slight improvements in dry density (with an increase of 8.67%) and thermal conductivity (with an increase of 24.65%). Moreover, CSLA geopolymer concrete also has a lower rate of mass change and a higher corrosion resistance coefficient, indicating a stronger ability to resist long-term corrosion. This work not only significantly enhances the performance of EPS in geopolymer concrete but also promotes the utilization of industrial solid waste.</p>

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Preparation of geopolymer-EPS core–shell lightweight aggregate and performance in lightweight geopolymer concrete

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Shun Bian,
  • Wen Tang,
  • Xiaorui Liu,
  • Yang Li,
  • Xiaoli Sun,
  • Yaping Yang,
  • Shijie Yan,
  • Yangyang Wu,
  • Guixiu Liu,
  • Jianming Dan,
  • Jinyu Wang

摘要

This study aims to overcome the limitations of expanded polystyrene (EPS) in geopolymer concrete, namely its hydrophobicity nature and low strength issues. A novel secondary coating process was employed to develop geopolymer-EPS core–shell lightweight aggregates (CSLAs) using industrial by-products such as fly ash, slag, carbide slag, and glauber’s salt, with the goal of enhancing the performance of geopolymer concrete. The main research findings reveal that, in comparison with EPS geopolymer concrete, the compressive strength of CSLA geopolymer concrete is significantly improved (with an increase of 57.93%), and there are slight improvements in dry density (with an increase of 8.67%) and thermal conductivity (with an increase of 24.65%). Moreover, CSLA geopolymer concrete also has a lower rate of mass change and a higher corrosion resistance coefficient, indicating a stronger ability to resist long-term corrosion. This work not only significantly enhances the performance of EPS in geopolymer concrete but also promotes the utilization of industrial solid waste.