| 미분탄 화력발전소 플라이 애쉬의 포졸란 특성에 관하여 |
| 장복기, 김윤주1 |
전남대학교 신소재공학부
1동신대학교 신소재공학부 |
| Pozzolanic Properties of Fly Ash from a Coal Fired Power Plant |
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| ABSTRACT |
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Cement paste, mortar or concrete specimens, substituting the content of Portland cement with fly ash up to 50 wt%, were prepared to investigate the effect of fly ash on the temperature, free lime content and strength etc. of mortar/concrete. Being compared with the concrete made of ordinary Portland cement, temperature increment of the concrete containing 50 wt% fly ash reduced, according to appropriate conversion formulae, to about 45％ at the 7 days curing time: the temperature increment of the former amounted to 33.4$^{circ}C$, while that of the latter only to 18.7$^{circ}C$. On the other hand, it is better to control the content of fly ash in the cement that is used for reinforced concrete not to exceed 30 wt％. In this study, more than 28 days curing time is necessary in order that the strength of concrete made of fly ash cement will be higher than that of pure Portland cement. In addition, 28-days concrete strength higher than 360 kg/$textrm{cm}^2$ could be easily achieved even with 50 wt% fly ash cement. |
| Key words:
Fly ash, Concrete temperature, Free lime, Microstructure, Strength |
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