Preparation and properties of fly ash-based geopolymer foams

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F14%3A00225631" target="_blank" >RIV/68407700:21110/14:00225631 - isvavai.cz</a>
Alternative codes found
RIV/60461373:22310/14:43898400
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Preparation and properties of fly ash-based geopolymer foams
Original language description
An extremely porous geopolymer material ? an incombustible alumino-silicate foam ? can be prepared by incorporating gas-forming agents into mixtures consisting of an alkaline activating agent (NaOH + sodium water glass) and fly ash. Aluminium powder or materials containing elemental Si (silica fume, FeSi or SiC) may be used as gas-forming agents. Macroscopic pores are given rise thanks to the release of gaseous hydrogen generated during the reaction of aluminium, respectively Si, in a strong alkaline environment. The formation of the foam becomes more intense if aluminium powder is used instead of silica fume. The effect of silica fume can only be observed at concentrations ranging from 5 to 10 percent by weight and at temperatures above 60°C because of a low content of elemental Si in silica fume. The foam formation takes place immediately after the addition of aluminium powder to the mixture but the foam collapsing must be prevented by incorporation of portland cement or lime. The Si
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JN - Civil engineering
OECD FORD branch
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Project
<a href="/en/project/GAP104%2F12%2F0102" target="_blank" >GAP104/12/0102: Aluminosilicate polymer foams</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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