Ceramics-Silikáty 50, (4) 208 - 215 (2006) |
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MICROSTRUCTURE OF GEOPOLYMER MATERIALS BASED ON FLY ASH
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Škvára František 1, Kopecký Lubomír 2, Němeček Jiří 2,
Bittnar Zdeněk 1
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1 Department of Glass and Ceramics, Institute of Chemical Technology in Prague, Technická 5, 166 28 Prague, Czech Republic
2 Department of Structural Mechanics, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic
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Keywords: Geopolymer, Fly ash, Microstructure
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Geopolymer prepared by brown coal fly ash alkali activation contains mainly structures of the types AlQ⁴
(4Si)and SiQ⁴
(3Al)
and SiQ⁴
(2-3Al). Any presence of the temporary phase with different composition was not found between geopolymer and
aggregate as it is at the concretes from Portland cement. Geopolymer composition is almost the same in the close nearness
even in the geopolymer matrix. Elastic modulus evaluated for the mixed geopolymeric and C–S–H phase by means of nanoindentation
was found to be E= 36.1 ± 5.1 GPa. Such result is comparable (a little bit higher) to ordinary Porland cement pastes. |
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