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Title |
The Properties of Internal Temperature of Paste and Concrete according to Component Ratio Variation of Ternary System Cement
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Keywords |
3성분계 시멘트 ; 간이 단열온도상승실험 ; 매스콘크리트 ; 수화열 ; 온도균열 ternary system cement ; semi-adiabatic temperature rising test ; mass concrete ; heat of hydration ; temperature crack |
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Abstract |
For this study, the semi-adiabatic temperature rising test is accomplished by using ternary system cement (OPC, BFS, FA) reducing temperature crack. Two tests are conducted; one is for the paste test, and the other is for the concrete test. As the results of paste tests, using fly ash is better to reduce hydration temperature than doing blast furnace slag. In the case of the paste mixed ternary system cement, the more fly ash is mixed and the less blast furnace slag is used, the lower the temperature is. The less the mixture ratio of blast furnace slag is and the more the mixture ratio of fly ash is, the later the temperature rising velocity and descending velocity are. Besides, the temperature is lower if water/binder ratio is high. The use of ternary system cement has the retardation effect of temperature rising because the time to reach the maximum temperature is in the order of OPC100, binary system cement, and ternary system cement. From the test, the maximum temperature of concrete used ternary system cement is 8~11oC lower than that of concrete used OPC100. Moreover, temperatures rising velocity and descending velocity of ternary system cement range 47~51% and 37~42% compared with OPC100. The specimen of concrete shows remarkable low internal temperature and slow temperature rising velocity and descending velocity compared with the specimen of paste because it is that temperature loss of concrete is much more than paste specimen according to aggregates.
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