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Light weight insulating concrete based on natural pumice aggregate
An available lightweight pumice aggregate was utilized in the preparation of phosphate-bonded lightweight concrete for thermal insulation of buildings and furnaces at medium temperatures up to 800 °C. The pumice grains were characterized for their chemical and phase composition as well as bulk density, pore-size distribution and microstructure. The aggregate was graded, mixed with the proper amount dilute phosphoric acid and then shaped, cured and dried at 110 °C The physical properties of the dried samples were investigated by means of linear change, bulk density, cold crushing strength and thermal conductivity. Selected samples were heated at 800-1000 °C to follow up the changes of their phase composition and physical properties, including permanent linear change and thermal shock resistance in order to optimize their firing and maximum service temperatures. It is concluded that the pumice grains have low bulk density, high apparent porosity with very fine open pores and are mainly composed of an amorphous silica-rich phase with many high fluxing oxides, especially alkali oxides. The processed phosphate-bonded pumice-based concrete is recommended for low-temperature thermal insulation (<110°C) due to its low linear shrinkage and bulk density, as well as accepted cold crushing strength and thermal conductivity after air-curing and drying at 110 °C. It is also recommended to apply such concrete for medium-temperature thermal insulation up to 800°C as a volume-stable amorphous insulating concrete with low bulk density and thermal conductivity, as well as accepted cold crushing strength and thermal shock resistance.
Light weight insulating concrete based on natural pumice aggregate
An available lightweight pumice aggregate was utilized in the preparation of phosphate-bonded lightweight concrete for thermal insulation of buildings and furnaces at medium temperatures up to 800 °C. The pumice grains were characterized for their chemical and phase composition as well as bulk density, pore-size distribution and microstructure. The aggregate was graded, mixed with the proper amount dilute phosphoric acid and then shaped, cured and dried at 110 °C The physical properties of the dried samples were investigated by means of linear change, bulk density, cold crushing strength and thermal conductivity. Selected samples were heated at 800-1000 °C to follow up the changes of their phase composition and physical properties, including permanent linear change and thermal shock resistance in order to optimize their firing and maximum service temperatures. It is concluded that the pumice grains have low bulk density, high apparent porosity with very fine open pores and are mainly composed of an amorphous silica-rich phase with many high fluxing oxides, especially alkali oxides. The processed phosphate-bonded pumice-based concrete is recommended for low-temperature thermal insulation (<110°C) due to its low linear shrinkage and bulk density, as well as accepted cold crushing strength and thermal conductivity after air-curing and drying at 110 °C. It is also recommended to apply such concrete for medium-temperature thermal insulation up to 800°C as a volume-stable amorphous insulating concrete with low bulk density and thermal conductivity, as well as accepted cold crushing strength and thermal shock resistance.
Light weight insulating concrete based on natural pumice aggregate
Isolierender Leichtbeton basierend auf natürlichem Bimszuschlägen
Elmaghraby, M.S. (author) / Mekky, H.S. (author) / Serry, M.A. (author)
Interceram ; 61 ; 354-357
2012
4 Seiten, 6 Bilder, 3 Tabellen, 12 Quellen
Article (Journal)
English
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