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<p>The influence of heat curing effect on the mechanical properties of fly ash based geopolymer concrete (FAG) is significant. The purpose of this study is to investigate the effects of curing temperature and Alkali to Binder ratio (AL/B) on the mechanical characteristics of FAG, as well as the connection between macroscopic nonlinear constitutive behavior and mesoscopic damage processes. By performing uniaxial compression tests at different curing temperatures (ambient curing at 20&#xa0;°C, heat curing at 60&#xa0;°C, 80&#xa0;°C, 100&#xa0;°C, and 120&#xa0;°C) and AL/B (0.35 and 0.45), combined with nuclear magnetic resonance, scanning electron microscopy, and x-ray diffraction tests, the relationships between mechanical properties, stress-strain full curves, and microscopic features of FAG were investigated. The experimental findings showed that the peak stress and elastic modulus of FAG rose with increasing curing temperature, but the peak strain decreased. The development of N-A-S-H gel and the densification of the microstructure were crucial for improving FAG strength. The mesoscopic damage constitutive relationship of FAG was examined, correlating the deterioration trend of macroscopic mechanical properties with microstructural evolution to systematically clarify the development of FAG strength and its intrinsic deterioration mechanisms. This research established a theoretical foundation for the widespread adoption of FAG in engineering applications.</p>

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Mechanical properties and mesoscopic damage mechanism of fly Ash based geopolymer concrete under heat curing

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Weifeng Bai,
  • Guanghui Suo,
  • Junfeng Guan,
  • Chenyang Yuan,
  • Chaopeng Xie,
  • Lielie Li

摘要

The influence of heat curing effect on the mechanical properties of fly ash based geopolymer concrete (FAG) is significant. The purpose of this study is to investigate the effects of curing temperature and Alkali to Binder ratio (AL/B) on the mechanical characteristics of FAG, as well as the connection between macroscopic nonlinear constitutive behavior and mesoscopic damage processes. By performing uniaxial compression tests at different curing temperatures (ambient curing at 20 °C, heat curing at 60 °C, 80 °C, 100 °C, and 120 °C) and AL/B (0.35 and 0.45), combined with nuclear magnetic resonance, scanning electron microscopy, and x-ray diffraction tests, the relationships between mechanical properties, stress-strain full curves, and microscopic features of FAG were investigated. The experimental findings showed that the peak stress and elastic modulus of FAG rose with increasing curing temperature, but the peak strain decreased. The development of N-A-S-H gel and the densification of the microstructure were crucial for improving FAG strength. The mesoscopic damage constitutive relationship of FAG was examined, correlating the deterioration trend of macroscopic mechanical properties with microstructural evolution to systematically clarify the development of FAG strength and its intrinsic deterioration mechanisms. This research established a theoretical foundation for the widespread adoption of FAG in engineering applications.