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<p>Earthen buildings have been used for thousands of years, but they could face threats by fire during the service life. The evolution of thermal properties of compacted earth after high-temperature exposure is of great significance. In this study, thermal property tests were conducted on compacted earth with different non-hydraulic air lime contents after high-temperature exposure up to 900&#xa0;°C. Predictive models for thermal expansion coefficient, thermal diffusivity coefficient and thermal conductivity of compacted earth with air lime content were established. Scanning electron microscopy (SEM), thermogravimetric-differential scanning calorimetry analysis (TGA–DSC) and mercury intrusion porosimetry (MIP) tests were performed to reveal the material changes, pore parameters and pore structure distribution characteristics. The temperature of 500–600&#xa0;°C was identified as the threshold for sudden changes in specific heat capacity, thermal conductivity and thermal expansion coefficient. The major weight loss for unstabilized earth was 5.07% at 400–600&#xa0;°C, while for stabilized earth with 30% air lime, it was 11.97% at 600–800&#xa0;°C. The addition of air lime optimized the pore structure of compacted earth and reduced the combined percentage of macropores and mesopores by 63% compared to unstabilized earth. Furthermore, air lime significantly reduced the most probable pore diameter, when the temperature increased from 25 to 400&#xa0;°C.</p>

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Thermal properties and pore structure evolution of air lime-stabilized compacted earth after high temperatures

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Yi Luo,
  • Jieting Xu,
  • Yifan Zhang,
  • Pengpeng Ni,
  • Zhaoyu Wang

摘要

Earthen buildings have been used for thousands of years, but they could face threats by fire during the service life. The evolution of thermal properties of compacted earth after high-temperature exposure is of great significance. In this study, thermal property tests were conducted on compacted earth with different non-hydraulic air lime contents after high-temperature exposure up to 900 °C. Predictive models for thermal expansion coefficient, thermal diffusivity coefficient and thermal conductivity of compacted earth with air lime content were established. Scanning electron microscopy (SEM), thermogravimetric-differential scanning calorimetry analysis (TGA–DSC) and mercury intrusion porosimetry (MIP) tests were performed to reveal the material changes, pore parameters and pore structure distribution characteristics. The temperature of 500–600 °C was identified as the threshold for sudden changes in specific heat capacity, thermal conductivity and thermal expansion coefficient. The major weight loss for unstabilized earth was 5.07% at 400–600 °C, while for stabilized earth with 30% air lime, it was 11.97% at 600–800 °C. The addition of air lime optimized the pore structure of compacted earth and reduced the combined percentage of macropores and mesopores by 63% compared to unstabilized earth. Furthermore, air lime significantly reduced the most probable pore diameter, when the temperature increased from 25 to 400 °C.