Abstract
This paper reports a research on the properties of synthetic sodium aluminosilicate hydrate gels as models for the gels arising in alkali-activated aluminosilicate systems. The interaction between these N-A-S-H gels and aqueous calcium was studied to explore a potential consequence of mixing conventional Portland cements and alkali-activated systems. The properties of two N-A-S-H gels (with Si/Al=1 and 2) synthesized in highly alkaline media, in the presence of calcium are reported. N-A-S-H gels were synthesized using aluminum nitrate, sodium hydroxide, and a sodium silicate. FTIR, NMR, and TEM/EDX techniques were used to characterize N-A-S-H gels before and after adding calcium. The results obtained show that calcium is uptaken in N-A-S-H gels resulting in a modification of the chemical composition due to the substitution of sodium per calcium.
Original language | English |
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Pages (from-to) | 1934-1940 |
Number of pages | 7 |
Journal | Journal of the American Ceramic Society |
Volume | 93 |
Issue number | 7 |
Early online date | 12 Mar 2010 |
DOIs | |
Publication status | Published - Jul 2010 |
Keywords
- fly-ash
- silicate hydrate
- part 1
- geopolymers
- temperature
- activation
- cations
- systems
- FTIR