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http://dx.doi.org/10.4334/JKCI.2010.22.2.237

Evaluation of Strength and Stiffness Gain of Concrete at Early-ages  

Hong, Geon-Ho (Dept. of Architectural Engineering, Hoseo University)
Park, Hong-Gun (Dept. of Architecture, Seoul National University)
Eum, Tae-Sun (Ssangyong Technology Research Center)
Mihn, Joon-Soo (Dept. of Architectural Engineering, Hoseo University)
Kim, Yong-Nam (Samsung Engineering and Construction, Housing Division)
Publication Information
Journal of the Korea Concrete Institute / v.22, no.2, 2010 , pp. 237-245 More about this Journal
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.
Keywords
concrete; compressive strength; modulus of elasticity; stiffness; early age;
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Times Cited By KSCI : 2  (Citation Analysis)
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1 Euro-code 2, Design of Concrete Structures (BS EN 1992-1-1), BSI, 2004, pp. 27-37.
2 ACI Committee 318, Building Code Requirement for Structural Concrete and Commentary, American Concrete Institute, 2008, pp. 107-108.
3 한국콘크리트학회, 콘크리트구조설계기준 해설, 한국콘크리트학회, 2003, pp. 66-68.
4 한국콘크리트학회, 콘크리트구조설계기준 해설, 한국콘크리트학회, 2007, pp. 39-68.
5 이진용, 최수홍, 강석화, 이광명, “플라이애쉬 함유량이 콘크리트의 굳기 전 성질 및 역학적 특성에 미치는 영향,” 콘크리트학회 논문집, 11권, 6호, 1999, pp. 25-33.   과학기술학회마을
6 홍건호, 신영수, 정일영, “콘크리트의 강도 및 강성 발현 평가에 대한 기초적 연구,” 대한건축학회논문집, 12권, 7호, 1996, pp. 229-236.
7 ACI Committee 209, “Prediction of Creep, Shrinkage, and Temperature Effects in Concrete Structures,” ACI Manual of Concrete Practice, ACI 209R-92, 2008.
8 오재근, 강수민, 김욱종, “시공단계에 따른 RC공동주택의 동바리 하중 계측,” 한국콘크리트학회 봄학술대회 논문집, 20권, 1호, 2008, pp. 117-120.   과학기술학회마을
9 강수민, 이지웅, 오재근, 김욱종, 이도범, 박홍근, “시공 영향을 받는 플랫플레이트의 장기처짐,” 한국콘크리트학회 가을학술대회 논문집, 18권, 2호, 2006, pp. 149-152.   과학기술학회마을
10 장일영, 박훈규, 윤영수, “국내의 실험자료를 이용한 고강도 및 초고강도 콘크리트의 탄성계수식 제안,” 콘크리트학회 논문집, 8권, 6호, 1996, pp. 213-222.   과학기술학회마을
11 김무한, 정수영, 윤석천, 한천구, “고강도콘크리트의 개발과 공학적 특성에 관한 실험적 연구,” 대한건축학회논문집, 5권, 2호, 1989, pp. 153-163.
12 Shah, S. P. and Ahmad, S. H., High Performance Concrete and Applications, St. Edmundsbury Press, London, 1994, pp. 27-60.
13 Noguchi, T., Tomosawa, F., Nemati, K. M., Chiaia, B. M., and Fantilli, A. P., “A Practical Equation for Elastic Modulus of Concrete,” ACI Structural Journal, Vol. 106, No. 5, 2009, pp. 690-696.
14 Mesbah, H. A., Lachemi, M., and Aitcin, P. C., “Determination of Elastic Properties of High-performance Concrete at Early Ages,” ACI Materials Journal, Vol. 99 No. 1, 2002, pp. 37-41.
15 Logan, A., Choi, W., Mirmiran, A., Rizkalla, S., and Zia, P., “Short-term Mechanical Properties of High-strength Concrete,” ACI Materials Journal, Vol. 106, No. 5, 2009, pp. 413-418.