Microstructure of geopolymer materials based on fly ash

作者：Skvara Frantisek^*; Kopecky Lubomir; Nemecek Jiri; Bittnar Zdenek

来源：Ceramics-Silikaty, 2006, 50(4): 208-215.

• geopolymer
• fly ash
• microstructure

Geopolymer prepared by brown coal fly ash alkali activation contains mainly structures of the types AlQ(4)(4Si)and SiQ(4)(3Al) and SiQ(4)(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.

• 出版日期2006