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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Abdallah Ban-Nah Mahamat1 , Abdallah Dadi Mahamat1 Abakar Ali Bezei2 , André Donnot3 , Mahamat Barka4 and Sali Gaye5
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DOI:10.17265/2162-5263/2025.06.004
1. National Higher Institute of Sciences and Techniques of Abeche, Abeche, Chad 2. National Higher School of Public Works of N’Djamena, N’Djamena, Chad 3. University of Lorraine; Nancy, France 4. University of N’Djamena; N’Djamena, Chad 5. University of Iba Der Thiam of Thies, Thies, Senegal
This study aims to perform thermophysical characterization, thermogravimetric analysis, and specific surface area determination of a lime-stabilized mixture composed of previously studied Gaoui clay and Michemiré diatomite. Lime stabilization of clay is a widespread technique; the addition of diatomite significantly reduced the mixture’s thermophysical properties due to its porous structure. The absolute density was determined using a helium pycnometer, and the specific surface area, air permeability test, was also determined using a Blaine permeabilimeter. Experimental results showed that the thermal conductivity and thermal effusivity of the clay decreased significantly with the addition of the other two materials. They decreased from 0.74 W/m·K to 0.338 W/m·K and from 985.5 W/s1/2/m2/K to 519.6 W/s1/2/m2/K respectively, for the 100% clay and 50% clay + 35% diatomite + 15% lime formulations, at a compaction pressure of 3 MPa. Thermogravimetric analysis showed that at low temperatures (0 to 150 °C), free water from the materials began to evaporate. From medium temperatures (400 to 600 °C) to high temperatures (1,000 °C), the results showed a mass loss of 6% for Gaoui clay, 2% for Michemiré diatomite, and 1.5% for lime. The results of the Blaine test and air permeability tests demonstrated that the specific surface area of 100% clay is high at 0.355 m²/kg, followed by that of 100% diatomite at 0.305 m²/kg and that of 100% lime at 0.273 m²/kg.
Clay, diatomite, lime, thermophysical characterization, thermogravimetric analysis, Blaine fineness.
Abdallah Ban-Nah Mahamat, Abdallah Dadi Mahamat Abakar Ali Bezei, André Donnot, Mahamat Barka and Sali Gaye.Thermophysical Characterization, Thermogravimetric Analysis and Determination of the Specific Surface Area of a Clay-Diatomite Mixture Treated with Quicklime.Journal of Environmental Science and Engineering B 14 (2025) 283-293.doi:10.17265/2162-5263/2025.06.004
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