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Statements

Subject Item
n2:RIV%2F68407700%3A21110%2F11%3A00180836%21RIV12-GA0-21110___
rdf:type
n10:Vysledek skos:Concept
dcterms:description
The process of alkali activation of fly ash and metakaolin is examined in the view of micromechanics. Elasticity is predicted via semi-analytical homogenization methods, using a combination of intrinsic elastic properties obtained from nanoindentation, evolving volume fractions and percolation theory. A new quantitative model for volume fraction is formulated, distinguishing the evolution of unreacted aluminosilicate material, solid gel particles of N-A-S-H gel, and open porosity, which is partially filled with the activator. The stiffening of N-A-S-H gel is modeled by increasing the fraction of solid gel particles. Their packing density and intrinsic elasticity differ in N-A-S-H gels synthesized from both activated materials. The low ability of N-A-S-H gel to bind water chemically explains the high porosity of Ca-deficient activated materials. The process of alkali activation of fly ash and metakaolin is examined in the view of micromechanics. Elasticity is predicted via semi-analytical homogenization methods, using a combination of intrinsic elastic properties obtained from nanoindentation, evolving volume fractions and percolation theory. A new quantitative model for volume fraction is formulated, distinguishing the evolution of unreacted aluminosilicate material, solid gel particles of N-A-S-H gel, and open porosity, which is partially filled with the activator. The stiffening of N-A-S-H gel is modeled by increasing the fraction of solid gel particles. Their packing density and intrinsic elasticity differ in N-A-S-H gels synthesized from both activated materials. The low ability of N-A-S-H gel to bind water chemically explains the high porosity of Ca-deficient activated materials.
dcterms:title
Micromechanical multiscale model for alkali activation of fly ash and metakaolin Micromechanical multiscale model for alkali activation of fly ash and metakaolin
skos:prefLabel
Micromechanical multiscale model for alkali activation of fly ash and metakaolin Micromechanical multiscale model for alkali activation of fly ash and metakaolin
skos:notation
RIV/68407700:21110/11:00180836!RIV12-GA0-21110___
n10:predkladatel
n18:orjk%3A21110
n3:aktivita
n20:P
n3:aktivity
P(GA103/09/1748), P(GAP104/10/2344)
n3:cisloPeriodika
20
n3:dodaniDat
n9:2012
n3:domaciTvurceVysledku
n6:3161471 n6:7575505 n6:3008142 n6:2233061 n6:4731328
n3:druhVysledku
n16:J
n3:duvernostUdaju
n7:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
212319
n3:idVysledku
RIV/68407700:21110/11:00180836
n3:jazykVysledku
n17:eng
n3:klicovaSlova
alkali-activation; fly ash; metakaolin; micromechanics; nanoindentation; N-A-S-H gel
n3:klicoveSlovo
n11:nanoindentation n11:N-A-S-H%20gel n11:metakaolin n11:fly%20ash n11:alkali-activation n11:micromechanics
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[6CF41C606BC6]
n3:nazevZdroje
Journal of Materials Science
n3:obor
n14:JH
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
6
n3:projekt
n13:GAP104%2F10%2F2344 n13:GA103%2F09%2F1748
n3:rokUplatneniVysledku
n9:2011
n3:svazekPeriodika
46
n3:tvurceVysledku
Šulc, Rostislav Němeček, Jiří Šmilauer, Vít Hlaváček, Petr Škvára, F. Kopecký, Lubomír
n3:wos
000293137500009
s:issn
0022-2461
s:numberOfPages
11
n15:doi
10.1007/s10853-011-5601-x
n8:organizacniJednotka
21110