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Title |
A Study on a Method to Determine Experimental Variables for Creep and Shrinkage of Concrete
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Authors |
조선두(Seon Doo Jo) ; 송은석(En Seok Song) ; 김진근(Jin Keun Kim) ; 권승희(Seung Hee Kwon) |
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DOI |
https://doi.org/10.4334/JKCI.2019.31.6.619 |
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Keywords |
콘크리트; 장기거동; 크리프; 건조수축; 실험변수 concrete; long-term behavior; creep; shrinkage; experimental variables |
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Abstract |
Concrete long-term behavior prediction models have many errors. In order to increase the accuracy of the long-term behavior prediction of structures long-term behavior experiments are performed at the laboratory level to correct the prediction model. However, long-term behavior experiments are time-consuming and costly, and there are many constraints on the experimental conditions, so it is difficult to test all of the various experimental variables that affect long-term behavior. Therefore, this study proposed an optimum determination method of creep and shrinkage experimental variables to construct a concrete long-term behavior prediction model with minimum experimentation. The general properties of concrete long-term behavior with specified compressive strength of 40 MPa were analyzed using the existing long-term behavior prediction model. From the properties of the concrete long-term behavior, optimum experimental variables of creep and shrinkage were proposed. It was found that it is reasonable to construct a long-term behavior prediction model by experimenting with three variables for age of concrete at loading (1~14 days, 14~84 days, 84~365 days), two variables for relative humidity (40~60 %, 60~80 %), and three variables for volume-surface ratio (37.5 mm, 75~200 mm, over 200 mm) for creep experimental variables; two variables for age of concrete when drying starts (1~14 days, 14~365 days), two variables for relative humidity (40~60 %, 60~80 %), and two variables for volume-surface ratio (same size as creep specimens) for shrinkage experimental variables.
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