Abstract
Pore solution of hardened alkali-activated fly ash paste was extracted by the steel-die method. The aqueous phase composition of pore solution was analyzed using ICP-OES analysis technique. The results show that the concentrations of Si, Al, Ca, K and OH- decrease with curing time regardless of the curing temperatures (40°C/60°C) and alkaline activators (sodium hydroxide with/without sodium silicate). On the contrary, the concentration of S increases with curing time. A higher temperature curing decreases the solubility of Si, Al, Ca and K in the alkali-activated fly ash, while it doesn’t show much influence on the solubility of S. The plot of the concentration of Al versus the concentration of Si displays a quasi-linear logarithmic relationship. This relationship implies congruent removal of Si and Al from the frameworks of fly ash.
Original language | English |
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Title of host publication | Non-Traditional Cement and Concrete |
Publisher | Trans Tech Publications |
Pages | 65-68 |
Number of pages | 4 |
Volume | 761 KEM |
ISBN (Print) | 9783038354406 |
DOIs | |
Publication status | Published - 2018 |
Event | 6th International Conference Non-Traditional Cement and Concrete, 2017 - Brno, Czech Republic Duration: 19 Jun 2017 → 22 Jun 2017 Conference number: 6 |
Publication series
Name | Key Engineering Materials |
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Volume | 761 KEM |
ISSN (Print) | 1013-9826 |
Conference
Conference | 6th International Conference Non-Traditional Cement and Concrete, 2017 |
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Country/Territory | Czech Republic |
City | Brno |
Period | 19/06/17 → 22/06/17 |
Keywords
- Chemical composition
- Fly ash
- Geopolymer
- Pore solution
- Solubility