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Title |
Evaluation of Strength and Stiffness Gain of Concrete at Early-ages
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Authors |
홍건호 ; 박홍근 ; 엄태선 ; 민준수 ; 김용남 |
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Keywords |
콘크리트 ; 압축강도 ; 탄성계수 ; 강성 ; 조기 재령 concrete ; compressive strength ; modulus of elasticity ; stiffness ; early age |
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Abstract |
Recently, deflection of the slab during construction periods becoming one of the important issues because of increasing the large-span structures. Early removing the form and support of the slab to achieve the rapid construction cause falling-off in quality of the structures. To reduce these deterioration and make rapid construction, construction of strength and stiffness gain model is needed by the research about the early-age concrete properties. Previous research results indicated that concrete model in existing design codes could not provide the mechanical properties of early age concrete. This paper carried out the concrete compressive strength tests on the curing age at early age stage. Evaluation of the accuracy of compressive strength and modulus of elasticity gain formula in existing various design codes was performed based on this test results, and new design model was proposed. This new model will be useful to develop the new rapid construction methods or prevent the deterioration of the deflection at construction periods. Material tests were performed at 1, 3, 7, 14, 28 curing days, total 159 cylinder style specimens were tested. Based on analyzing the test results, the relationship between compressive strength and modulus of elasticity at early age was proposed.
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