|
|
|
Journal of the Korean Ceramic Society 1996;33(12): 1331. |
| 플라이 애쉬-황산-수한화칼슘계의 반응 |
| 송종택, 안민선, 정문영1 |
단국대학교 재료공학과
1(주)주일 |
| Reaction of the System of Coal Fly Ash-Sulfuric Acid-Calcium Hydroxide |
|
|
|
|
|
|
|
| ABSTRACT |
|
In order to investigate the reaction in the system of fly ash-sulfuric acid-calcium hydroxide the hydrates were produced by the addition of Ca(OH)2 to fly ash activated with sulfuric acid at various temperatures. And then they were characterized by XRD. SEM and TG-DTA. It was found that in the reaction of fly ash with sulfuric acid fly ash was not decomposed but Al2O3 and SiO2 component in it were activated. The addition of calcium hydroxide into this system resulted in the formation of ettringite and calcium silicate hydrate (C-S-H) As the concentration of sulfuric acid and reaction temperature increased the amount of calcium hydroxide decreased fast. At this time gypsum produced by the reaction calcium hydroxide with sulfuric acid was consumed to form ettringite. Accordingly the formation of ettringite increased with calcium hydroxide and reaction time. And it showed faster than the formation of C-S-H. |
| Key words:
Fly ash, Sulfuric acid, Calcium hydroxide, Ettringite, C-S-H |
|
|
|
PDF Links
Full text via DOI 
Download Citation 
