Experimental study on the convective heat transfer coefficient of early-age concrete |
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| Authors: | Yun Lee Myoung-Sung Choi Seong-Tae Yi Jin-Keun Kim |
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| Affiliation: | 1. Department of Architecture, College of Engineering, Ewha Womans University, 11-1, Daehyun-dong, Seodaemun-gu, Seoul 120-750, South Korea;2. Daewoo Institute of Construction and Technology, Suwon 440-210, South Korea;3. Department of Civil Engineering, Chung Cheong University, 330, Wolgok-ri, Kangnae-myun, Cheongwon-kun, Chungbuk-do 363-792, South Korea;4. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1, Kuseong-dong, Yusong-gu, Daejeon 305-701, South Korea;1. College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China;2. Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu 808-0135, Japan;3. Institute of Disaster Management and Reconstruction, Sichuan University-Hong Kong PolyU, Chengdu 610065, PR China;1. DICiv, University of Salerno, Italy;2. COPPE-PEC – Federal University of Rio de Janeiro, Brazil;3. Microlab, Delft University of Technology, The Netherlands;4. LMNI, Intecin/CONICET, FIUBA, University of Buenos Aires, Bs.As., Argentina;1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, A-1 Fuxing Road, Beijing 100038, PR China;2. Department of Structures and Materials, China Institute of Water Resources and Hydropower Research, A-1 Fuxing Road, Beijing 100038, PR China;1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, PR China;2. College of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China;3. Jiangsu Sobute New Materials Co. Ltd., Nanjing 211103, PR China;4. State Key Laboratory of High Performance Civil Engineering Material, Nanjing 210008, PR China;5. State Grid Shanghai Construction Company, Shanghai 200120, PR China;1. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Department of Civil Engineering, Daejeon University, 62 Daehak-ro, Dong-gu, Daejeon 300-716, Republic of Korea;3. NUST Institute of Civil Engineering, School of Civil and Environmental Engineering, National University of Science and Technology, Islamabad, Pakistan;4. Dam Safety Research Center, K-water Institute, 200 Sintanjin-ro, Daedeok-gu, Daejeon 306-711, Republic of Korea |
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| Abstract: | During the process of setting and hardening in concrete, the temperature profile shows a gradual nonlinear distribution due to the development of heat of hydration in cement. At early ages of concrete structures, this nonlinear distribution can have a large influence on crack evolution. It is thus important to obtain an accurate temperature history, and to do this, it is necessary to examine the thermal properties of the concrete. In this study, the convective heat transfer coefficient, which represents the heat transfer between a concrete surface and ambient air, was experimentally investigated with test variables such as the velocity of wind, the curing conditions, and the ambient temperature.For analyses using the thermal equilibrium boundary condition, it is generally noted that most of the heat release by the evaporation of moisture occurs at an early stage. To consider this phenomenon, the existing thermal equilibrium boundary condition has been modified so as to consider the evaporation quantity due to the evaporation effect. Convective heat transfer coefficients for a specific case were then calculated from the modified thermal equilibrium boundary condition using experimental results. |
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