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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F12%3A43894978%21RIV13-GA0-22310___
rdf:type
n12:Vysledek skos:Concept
dcterms:description
The alkali bond in (N, K)-A-S-H gels presents an up-to-date insufficiently resolved issue with significant consequences for efflorescence in alkali-activated materials. A series of experiments shows nearly all alkalis are leachable from alkaliactivated fly-ash and metakaolin in excessive amounts of deionized water. A diffusion-based model describes well the alkali leaching process. Negligible changes of the (N, K)-A-S-H gel nanostructure indicate that Na,K do not form the gel backbone and H3O+ is probably the easiest substitution for the leached alkalies. Small changes in the long-term compressive strength of leached specimens support this hypothesis. The alkali bond in (N, K)-A-S-H gels presents an up-to-date insufficiently resolved issue with significant consequences for efflorescence in alkali-activated materials. A series of experiments shows nearly all alkalis are leachable from alkaliactivated fly-ash and metakaolin in excessive amounts of deionized water. A diffusion-based model describes well the alkali leaching process. Negligible changes of the (N, K)-A-S-H gel nanostructure indicate that Na,K do not form the gel backbone and H3O+ is probably the easiest substitution for the leached alkalies. Small changes in the long-term compressive strength of leached specimens support this hypothesis.
dcterms:title
A weak alkali bond in (N,K)-A-S-H gels: evidence from leaching and modeling A weak alkali bond in (N,K)-A-S-H gels: evidence from leaching and modeling
skos:prefLabel
A weak alkali bond in (N,K)-A-S-H gels: evidence from leaching and modeling A weak alkali bond in (N,K)-A-S-H gels: evidence from leaching and modeling
skos:notation
RIV/60461373:22310/12:43894978!RIV13-GA0-22310___
n12:predkladatel
n18:orjk%3A22310
n4:aktivita
n17:P
n4:aktivity
P(GAP104/10/2344), P(GAP104/12/0102)
n4:cisloPeriodika
4
n4:dodaniDat
n9:2013
n4:domaciTvurceVysledku
n15:8756880 n15:6096255
n4:druhVysledku
n19:J
n4:duvernostUdaju
n7:S
n4:entitaPredkladatele
n6:predkladatel
n4:idSjednocenehoVysledku
120735
n4:idVysledku
RIV/60461373:22310/12:43894978
n4:jazykVysledku
n16:eng
n4:klicovaSlova
Efflorescence; Leaching; Geopolymer; N-A-S-H gel; Aluminosilicate gel
n4:klicoveSlovo
n10:Leaching n10:Efflorescence n10:N-A-S-H%20gel n10:Aluminosilicate%20gel n10:Geopolymer
n4:kodStatuVydavatele
CZ - Česká republika
n4:kontrolniKodProRIV
[685A0D90B501]
n4:nazevZdroje
Ceramics-Silikáty
n4:obor
n13:JN
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
5
n4:projekt
n5:GAP104%2F10%2F2344 n5:GAP104%2F12%2F0102
n4:rokUplatneniVysledku
n9:2012
n4:svazekPeriodika
56
n4:tvurceVysledku
Kopecký, Lubomír Šmilauer, Vít Hlaváček, Petr Škvára, František Cílová, Zuzana
s:issn
0862-5468
s:numberOfPages
9
n14:organizacniJednotka
22310