ABK o niskiej przewodności cieplnej

• Autorzy: Straube B. , Walther H.

Warianty tytułu

EN

AAC with low thermal conductivity

• Języki publikacji: PL

Abstrakty

EN

The structure of this optimized autoclaved aerated concrete (AAC) consisting essentially of calcium silicate hydrate phases, especially of 11 A* tobermorite does not contain inorganic filler like calcite. The absence of quartz and crystalline fillers ensures lower thermal conductivity values oven though the crystal structure of the silicate hydrate phases (CSH) phases. According to the tests, the calcium silicate hydrate pore structure with the residual quartz grain contents below 10% by mass is producible by ensuring that the SiO2 component in the hydrothermal process reacts fully or nearly fully (< 10% by mass of residual quartz grains) with the CaO component to give CSH phases, especially crystalline CSH phases, preferably to give 11 A* tobermorite which crystallizes out particularly efficiently. In terms of production, this is achieved by a common autoclaving process and by the use of very fine quartz flour as the SiO2 componenet. The production is not possible using cryptocrystalline or amorphous silica, for example with fumed silica or precipitated silica or with microsilica (amorphous SiO2 which forms in the preparation of silicon metals from ferrosilicon).

Słowa kluczowe

PL

beton komórkowy; przewodność cieplna; gęstość objętościowa; surowiec; wytrzymałość na ściskanie

EN

autoclaved aerated concrete; thermal conductance; apparent density; raw materials; compessive strength

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Materiały Budowlane
• Rocznik: 2013
• Tom: nr 2
• Strony: 40--41
• Opis fizyczny: Bibliogr. 5 poz., il.

Twórcy

autor

Straube B.

autor

Walther H.

• Xella Technologie- und Forschungsgesellschaft GmbH, Niemcy

Bibliografia

• [1] Oel H, J., 1980. Wärmeleitfähigkeit und Festigkeit von Calzium Hydrosilicat-Produkten, Abschlußbericht DFG Forschungsvorhaben Mo 256/6.
• [2] Lippe K. L., 1985. „Entwicklung hochporöser C-S-H- Werkstoffe mit minimaler Wärmeleitfähigkeit”, BMFT Forschungsbericht.
• [3] Ehlebracht T. et al., 2008. Process for reducing the heat conductivity of calcium silicate building blocks and calcium silicate building blocks with improved heat conductivity, patent EP 1 892 226 A2.
• [4] Zürn S. G., 1997. „Einfluss der Sandminerale auf die Bildung von Calcium- silikathydraten (CSH-Phasen), das Gefüge und die mechanischen Eigenschaften von Porenbetonprodukten”, Logos Verlag Berlin.
• [5] Straube B. et. al., 2010. Aerated concrete material and process for production thereof, patent DE 10 2008 047 160A1.