About: A weak alkali bond in (N,K)-A-S-H gels: evidence from leaching and modeling

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. (en)
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 (en)
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 (en)
skos:notation	RIV/60461373:22310/12:43894978!RIV13-GA0-22310___
http://linked.open...avai/predkladatel	Fakulta chemické technologie
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GAP104/10/2344), P(GAP104/12/0102)
http://linked.open...iv/cisloPeriodika	4
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Cílová, Zuzana Škvára, František
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemické technologie
http://linked.open...dnocenehoVysledku	120735
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/12:43894978
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Efflorescence; Leaching; Geopolymer; N-A-S-H gel; Aluminosilicate gel (en)
http://linked.open.../riv/klicoveSlovo	Geopolymer Aluminosilicate gel Leaching Efflorescence N-A-S-H gel
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[685A0D90B501]
http://linked.open...i/riv/nazevZdroje	Ceramics-Silikáty
http://linked.open...in/vavai/riv/obor	JN
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Aluminosilicate polymer foams Surface Modification of PET Fibers to Improve Mechanical Properties of PET Reinforcement at Cement Composites
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	56
http://linked.open...iv/tvurceVysledku	Cílová, Zuzana Hlaváček, Petr Kopecký, Lubomír Šmilauer, Vít Škvára, František
issn	0862-5468
number of pages	9 (xsd:int)
http://localhost/t...ganizacniJednotka	22310
is http://linked.open...avai/riv/vysledek of	A weak alkali bond in (N,K)-A-S-H gels: evidence from leaching and modeling

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