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Thermalinsulating materials from xonotlite and tobermorite
It has been determined that while using silica fume xonotlite, the most stable low-base calcium silicate hydrate, readily forms. Optimal hydrothermal conditions of the synthesis are the following: C/S of the mixture - 1.0, the temperature of saturated water vapor - 200 deg C, the duration - 2 hours, W/S of the suspension - 20, mixing intensity - 60 rpm. While applying silica fume it is feasible to produce thermally insulating materials of high quality. The parameters of secondary hydrothermal treatment - 4 hours at 200 deg C. The properties of specimens obtained: density - 164 kg/m3, bending strength - 0.50 MPa, compressive strength - 0.97 MPa, heat conductivity at 20 deg C - 0.051 W/(mK), the prevailing compound - xonotlite. Thermally insulating materials from xonotlite may be used up to the temperature of 1000 deg C. At this temperature their linear shrinkage is found to be nearby 0.5 %. When the specimens had been cured for 2 hours at 1000 deg C their bending strength comprised 88 % (0.44 MPa) while compressive strength 66 % (0.64 MPa) of the initial strength. In case tripoli is used optimal conditions of the synthesis of tobermorite are the temperature - 200 deg C, the duration 4 hours. Diatomite is a more reactive raw material and tobermorite is the prevailing compound after 2 hour synthesis at 200 deg C.
Thermalinsulating materials from xonotlite and tobermorite
It has been determined that while using silica fume xonotlite, the most stable low-base calcium silicate hydrate, readily forms. Optimal hydrothermal conditions of the synthesis are the following: C/S of the mixture - 1.0, the temperature of saturated water vapor - 200 deg C, the duration - 2 hours, W/S of the suspension - 20, mixing intensity - 60 rpm. While applying silica fume it is feasible to produce thermally insulating materials of high quality. The parameters of secondary hydrothermal treatment - 4 hours at 200 deg C. The properties of specimens obtained: density - 164 kg/m3, bending strength - 0.50 MPa, compressive strength - 0.97 MPa, heat conductivity at 20 deg C - 0.051 W/(mK), the prevailing compound - xonotlite. Thermally insulating materials from xonotlite may be used up to the temperature of 1000 deg C. At this temperature their linear shrinkage is found to be nearby 0.5 %. When the specimens had been cured for 2 hours at 1000 deg C their bending strength comprised 88 % (0.44 MPa) while compressive strength 66 % (0.64 MPa) of the initial strength. In case tripoli is used optimal conditions of the synthesis of tobermorite are the temperature - 200 deg C, the duration 4 hours. Diatomite is a more reactive raw material and tobermorite is the prevailing compound after 2 hour synthesis at 200 deg C.
Thermalinsulating materials from xonotlite and tobermorite
Siauciunas, R. (Autor:in) / Rupsyte, E. (Autor:in)
1999
11 Seiten, 3 Bilder, 5 Tabellen, 7 Quellen
Aufsatz (Konferenz)
Englisch
Tobermorit , Calciumsilicathydrat , hydrothermale Reaktion , chemische Zusammensetzung , Wasserdampfatmosphäre , Temperatur , Reaktionszeit , Wärmedämmstoff , Dichte , Biegefestigkeit , Druckfestigkeit , Wärmeleitfähigkeit , Hochtemperaturwerkstoff , Schrumpfung , Härten , Diatomit , Rohstoff , verunreinigender Stoff , Silicafeinststaub
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