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 Michemirédi...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 Michemirédiatomite.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/s^(1/2)/m^(2)/K to 519.6 W/s^(1/2)/m^(2)/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℃),free water from the materials began to evaporate.From medium temperatures(400 to 600℃)to high temperatures(1,000℃),the results showed a mass loss of 6%for Gaoui clay,2%for Michemirédiatomite,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 m^(2)/kg,followed by that of 100%diatomite at 0.305 m^(2)/kg and that of 100%lime at 0.273 m^(2)/kg.展开更多
文摘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 Michemirédiatomite.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/s^(1/2)/m^(2)/K to 519.6 W/s^(1/2)/m^(2)/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℃),free water from the materials began to evaporate.From medium temperatures(400 to 600℃)to high temperatures(1,000℃),the results showed a mass loss of 6%for Gaoui clay,2%for Michemirédiatomite,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 m^(2)/kg,followed by that of 100%diatomite at 0.305 m^(2)/kg and that of 100%lime at 0.273 m^(2)/kg.
