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http://dx.doi.org/10.5345/JKIBC.2020.20.5.409

Strength Correction Factors due to Temperature Drop of Structural Concrete under Low Temperature by the Equivalent Age Method  

Choi, Youn-Hoo (Department of Architectural Engineering, Cheong ju University)
Han, Min-Cheol (Department of Architectural Engineering, Cheong ju University)
Lee, Young-Jun (Department of Architectural Engineering, Cheong ju University)
Publication Information
Journal of the Korea Institute of Building Construction / v.20, no.5, 2020 , pp. 409-416 More about this Journal
Abstract
In this paper, strength correction factors of the concretes incorporating ordinary Portland cement(OPC), fly ash(FA) and blast furnace slag(BS) with 50% of water to binder ratio due to temperature drop for standard room temperature(20±3℃) are provided. For this, strength development was done based on equivalent age method. For calculating the equivalent age, apparent activation energy was obtained with 24.69 kJ/mol in OPC, 46.59 kJ/mol in FA, 54.59 kJ/ol in BS systems. According to the estimation of strength development of the concretes, the use of FA and BS resulted in larger strength drop than that of OPC under low temperature compared to standard room temperature. Hence, strength correction factors(Tn) for OPC, FA and BS are suggested within 4~17℃ with every 3MPa levels.
Keywords
curing temperature; equivalent age; apparent activation energy; strength correction factor with temperature level;
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