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<p>The main objective of this research is to study the chemical, mineralogical and thermophysical characteristics (Thermal conductivity, volumetric heat capacity, specific heat capacity, thermal diffusivity, and effusivity) of white earth bricks, stabilized with varying percentages of Portland cement (0%, 5%, 10%, 15%, 20%, 25%, and 30%). Microscopic characterization was conducted using Scanning Electron Microscopy (SEM). Calcium silicate hydrate and calcium hydroxide were observed in the samples formed during the cement hydration process. Energy Dispersive X-ray spectroscopy technique was employed to determine the chemical composition of the bricks. It showed the presence of oxygen, carbon, calcium and silicon atoms and traces of Te, Na, Mg, and Al. The X-ray diffraction technique revealed the dominance of quartz and calcite and traces of dolomite and rutile, while Muscovite appeared only in samples containing 5, 10 and 15% of cement, resulting in low thermal conductivity. X-ray fluorescence analysis confirmed the presence of these minerals. Thermophysical properties were evaluated as a function of cement percentage and temperature variation (20&#xa0;°C, 30&#xa0;°C, 40&#xa0;°C and 50&#xa0;°C). The results showed that thermophysical properties decreased, particularly for low cement percentages, but increased as cement content rose. The increase rate was 45% for thermal conductivity, 52% for volumetric heat capacity, 26% for specific heat, 27% for thermal diffusivity, and 40% for effusivity. Furthermore, A slight decrease in the thermophysical properties was observed after the temperature increase from 20 to 50&#xa0;°C; this result was more evident, especially in the samples (20%, 25%, and 30%).</p>

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Temperature and cement content effect on thermophysical properties of compressed white earth bricks

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Randa Bakari,
  • Abderrahim Samaouali,
  • Fatima Kanibou,
  • Karima Ouaazizi,
  • Asmae Arbaoui

摘要

The main objective of this research is to study the chemical, mineralogical and thermophysical characteristics (Thermal conductivity, volumetric heat capacity, specific heat capacity, thermal diffusivity, and effusivity) of white earth bricks, stabilized with varying percentages of Portland cement (0%, 5%, 10%, 15%, 20%, 25%, and 30%). Microscopic characterization was conducted using Scanning Electron Microscopy (SEM). Calcium silicate hydrate and calcium hydroxide were observed in the samples formed during the cement hydration process. Energy Dispersive X-ray spectroscopy technique was employed to determine the chemical composition of the bricks. It showed the presence of oxygen, carbon, calcium and silicon atoms and traces of Te, Na, Mg, and Al. The X-ray diffraction technique revealed the dominance of quartz and calcite and traces of dolomite and rutile, while Muscovite appeared only in samples containing 5, 10 and 15% of cement, resulting in low thermal conductivity. X-ray fluorescence analysis confirmed the presence of these minerals. Thermophysical properties were evaluated as a function of cement percentage and temperature variation (20 °C, 30 °C, 40 °C and 50 °C). The results showed that thermophysical properties decreased, particularly for low cement percentages, but increased as cement content rose. The increase rate was 45% for thermal conductivity, 52% for volumetric heat capacity, 26% for specific heat, 27% for thermal diffusivity, and 40% for effusivity. Furthermore, A slight decrease in the thermophysical properties was observed after the temperature increase from 20 to 50 °C; this result was more evident, especially in the samples (20%, 25%, and 30%).