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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F14%3A43898400%21RIV15-GA0-22310___
rdf:type
skos:Concept n15:Vysledek
rdfs:seeAlso
http://www.ceramics-silikaty.cz/2014/pdf/2014_03_188.pdf
dcterms: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 reaction in the strong alkaline environment is boosted by the presence of an alumino-silicate material, ie the fly ash. Geopolymer foams prepared by addition of gas-forming aluminium powder or silica fume are characterized by similar pore sizes; the pore size is comparable with that observed in lime-silicate materials produced in autoclave. The volume weight of geopolymer foams is similar to that of other inorganic foams. The strength of geopolymer foams is dependent on their volume weigth. Mechanical properties of geopolymer foams were stable over the investigated period of a year. Geopolymer foams are incombustible and can resist temperatures of up to 1000°C without any sign of decomposition. Their shape does not change after exposure to temperatures ranging from 400 to 800°C. In contrast to lime-silicate foams and cement-based foams the firing of geopolymer foams is not accompanied by the formation of any cracks or by any additional changes (rehydration). 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 reaction in the strong alkaline environment is boosted by the presence of an alumino-silicate material, ie the fly ash. Geopolymer foams prepared by addition of gas-forming aluminium powder or silica fume are characterized by similar pore sizes; the pore size is comparable with that observed in lime-silicate materials produced in autoclave. The volume weight of geopolymer foams is similar to that of other inorganic foams. The strength of geopolymer foams is dependent on their volume weigth. Mechanical properties of geopolymer foams were stable over the investigated period of a year. Geopolymer foams are incombustible and can resist temperatures of up to 1000°C without any sign of decomposition. Their shape does not change after exposure to temperatures ranging from 400 to 800°C. In contrast to lime-silicate foams and cement-based foams the firing of geopolymer foams is not accompanied by the formation of any cracks or by any additional changes (rehydration).
dcterms:title
Preparation and properties of fly ash-based geopolymer foams Preparation and properties of fly ash-based geopolymer foams
skos:prefLabel
Preparation and properties of fly ash-based geopolymer foams Preparation and properties of fly ash-based geopolymer foams
skos:notation
RIV/60461373:22310/14:43898400!RIV15-GA0-22310___
n3:aktivita
n16:P
n3:aktivity
P(GAP104/12/0102)
n3:cisloPeriodika
3
n3:dodaniDat
n11:2015
n3:domaciTvurceVysledku
n8:6127959 n8:8756880 n8:6096255
n3:druhVysledku
n17:J
n3:duvernostUdaju
n4:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
39007
n3:idVysledku
RIV/60461373:22310/14:43898400
n3:jazykVysledku
n14:eng
n3:klicovaSlova
Fly ash; Macro-porosity; Foam; Geopolymer
n3:klicoveSlovo
n13:Foam n13:Fly%20ash n13:Macro-porosity n13:Geopolymer
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[BEF77D5CAA63]
n3:nazevZdroje
Ceramics-Silikáty
n3:obor
n19:JJ
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
6
n3:projekt
n7:GAP104%2F12%2F0102
n3:rokUplatneniVysledku
n11:2014
n3:svazekPeriodika
58
n3:tvurceVysledku
Skřičík, Petr Zlámalová Cílová, Zuzana Škvára, František Šmilauer, Vít Tišler, Zdeněk Šulc, Rostislav
s:issn
0862-5468
s:numberOfPages
10
n18:organizacniJednotka
22310