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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
High porosity (> 90%) cementitious foams
High porosity foams based on Portland limestone cement or gypsum plaster were prepared by a simple method of stirring and drying using low levels of the food additives: methyl cellulose and iota carageenan gum. Thermal conductivity of 0.11 W m- 1 K- 1 at 92% porosity was achieved but compressive strength was also very low. Foams were almost closed cell. Attempts to improve strength by incorporation of short staple glass fibre were only partially successful because of a change in the failure mode from progressive collapse to uniform fibre-cement debonding facilitated by the ability of the fibre network to transmit stress throughout the assembly. This approach to fire resistant insulation materials does not yet match the high strength/conductivity ratios of calcium silicate products but deserves exploring because of the simplicity of preparation and the compositional freedom for using mixtures of hydraulic cement and other powders.
High porosity (> 90%) cementitious foams
High porosity foams based on Portland limestone cement or gypsum plaster were prepared by a simple method of stirring and drying using low levels of the food additives: methyl cellulose and iota carageenan gum. Thermal conductivity of 0.11 W m- 1 K- 1 at 92% porosity was achieved but compressive strength was also very low. Foams were almost closed cell. Attempts to improve strength by incorporation of short staple glass fibre were only partially successful because of a change in the failure mode from progressive collapse to uniform fibre-cement debonding facilitated by the ability of the fibre network to transmit stress throughout the assembly. This approach to fire resistant insulation materials does not yet match the high strength/conductivity ratios of calcium silicate products but deserves exploring because of the simplicity of preparation and the compositional freedom for using mixtures of hydraulic cement and other powders.
High porosity (> 90%) cementitious foams
Akthar, F.K. (Autor:in) / Evans, J.R.G. (Autor:in)
Cement and Concrete Research ; 40 ; 352-358
2010
7 Seiten, 33 Quellen
Aufsatz (Zeitschrift)
Englisch
Additiv , Calciumcarbonat , Druckfestigkeit , Fehleranalyse , geschlossene Zelle , Gips , glasfaserverstärkter Zement , hydraulischer Zement , In-Situ-Verschäumung , Kalk , Kurzfaserverstärkung , mechanische Verstärkung , Methylcellulose , Mikrostruktur , Naturkautschuk , Porosität , Portlandzement , Schaumbeton , Wärmeleitfähigkeit
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