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Granular Foam-Glass-Ceramic Thermal Insulation Based on Natural Quartz Sand
The article describes the modification of the production technology of granular alkali-silicate thermal insulation materials. The modification lies in the fact that natural quartz sand is used as a silica precursor, instead of amorphous silica, due to its greater availability. A mixture of glassy sodium silicate with soda and/or sodium hydroxide additives acts as an alkaline precursor. The intermediate material (pregranulate) is obtained by mixing the sand with a binder solution simultaneously with granulation followed by drying at 200 °C. Another feature of the technology is the high temperature of the pregranulate firing (850–930 °C). The closed nature of porosity, along with a high silicate modulus, significantly increases the water resistance of the foam silicate and also significantly reduces its thermal conductivity and water absorption. As a result, a granular foam material with a bulk density of 170–440 kg/m3, compression strength in a cylinder of 0.5–6.3 MPa, thermal conductivity of 0.046–0.084 W/(m·K), volume water absorption of 7.8–13.5%, weight loss when boiling in water 0.12–0.33%. According to its consumer properties, the foam material is not inferior to that obtained with amorphous silica, but differs in cheaper logistics.
Granular Foam-Glass-Ceramic Thermal Insulation Based on Natural Quartz Sand
The article describes the modification of the production technology of granular alkali-silicate thermal insulation materials. The modification lies in the fact that natural quartz sand is used as a silica precursor, instead of amorphous silica, due to its greater availability. A mixture of glassy sodium silicate with soda and/or sodium hydroxide additives acts as an alkaline precursor. The intermediate material (pregranulate) is obtained by mixing the sand with a binder solution simultaneously with granulation followed by drying at 200 °C. Another feature of the technology is the high temperature of the pregranulate firing (850–930 °C). The closed nature of porosity, along with a high silicate modulus, significantly increases the water resistance of the foam silicate and also significantly reduces its thermal conductivity and water absorption. As a result, a granular foam material with a bulk density of 170–440 kg/m3, compression strength in a cylinder of 0.5–6.3 MPa, thermal conductivity of 0.046–0.084 W/(m·K), volume water absorption of 7.8–13.5%, weight loss when boiling in water 0.12–0.33%. According to its consumer properties, the foam material is not inferior to that obtained with amorphous silica, but differs in cheaper logistics.
Granular Foam-Glass-Ceramic Thermal Insulation Based on Natural Quartz Sand
Lecture Notes in Civil Engineering
Akimov, Pavel (editor) / Vatin, Nikolai (editor) / Tusnin, Aleksandr (editor) / Doroshenko, Anna (editor) / Vedyakov, Ivan (author) / Vaskalov, Vladimir (author) / Maliavski, Nikolai (author) / Nezhikov, Andrey (author) / Vedyakov, Mikhail (author)
2022-09-03
11 pages
Article/Chapter (Book)
Electronic Resource
English
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