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Title |
Evaluation of Properties of 80, 130, 180 MPa High Strength Concrete at High Temperature with Heating and Loading
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Authors |
최경철 ; 윤민호 ; 이태규 ; 이승훈 ; 김규용 |
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DOI |
https://doi.org/10.4334/JKCI.2013.25.6.613 |
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Keywords |
고강도 콘크리트 ; 잔존 압축강도 ; 잔존 탄성계수 ; 열팽창변형 ; 단기 고온크리프 high strength concrete ; residual compressive strength ; residual elastic modulus ; thermal strain ; transient creep |
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Abstract |
Concrete has been recognized as a material which is resistant to high temperatures, but chemicophysical property of concrete is changed by the high temperature. So, mechanical properties of concrete may be reduced. Because of this, standards and researches on the degradation of the mechanical properties of concrete at high temperatures have been presented. However, research data about the state that considering the loading condition and high-strength concrete is not much. Therefore, this study evaluated the high-temperature properties of high-strength concrete by loading condition and elevated temperature. The stress-strain, strain at peak stress, compressive strength, elastic modulus, thermal strain and the transient creep are evaluated under the non-loading and 0.25fcu loading conditions on high strength concrete of W/B 12.5%, 14.5% and 20%. Result of the experiment, decrease in compressive strength due to high temperature becomes larger as the compressive strength increases, and residual rate of elastic modulus and compressive strength is high by the shrinkage caused by loading and thermal expansion due to high temperature are offset from each other, at a temperature above 500℃.
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