Experimental study on the dynamic compressive mechanical properties of concrete at elevated temperature |
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| Affiliation: | 1. Department of Airfield and Building Engineering, Air Force Engineering University, Xi’an 710038, Shaanxi, China;2. College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi’an 710072, Shaanxi, China;1. Department of Architectural Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Republic of Korea;2. Department of Construction Technology, DSME Construction Co., Ltd., ELCRU Building, 636 Nonhyun-ro, Gangnam-gu, Seoul 135-010, Republic of Korea;1. Department of Civil Engineering, College of Technology and Engineering, MPUAT, Udaipur, India;2. Department of Civil Engineering, Malaviya National Institute of Technology Jaipur, Jaipur, India;1. Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China;2. Centre for Built Infrastructure Research, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia;3. Tianjin University, Tianjin 300072, China;1. Department of Structural Engineering, Tongji University, Shanghai 200092, PR China;2. State Key Lab. for Disaster Reduction in Civil Eng., Tongji University, Shanghai 200092, PR China;1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, 210007 Nanjing, China;2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, 221116 Xuzhou, China |
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| Abstract: | Strain rate effect and temperature effect are two important factors affecting the mechanical behavior of concrete. Each of them has been studied for several years. However, the two factors usually work together in the engineering practice. It is necessary to understand the mechanical responses of concrete under high strain rate and elevated temperature. A self-designed high temperature SHPB apparatus was used to study the dynamic compressive mechanical properties of concrete at elevated temperature. The results show that the dynamic compressive strength and specific energy absorption of concrete increase with strain rate at all temperatures. The elastic modulus decreases obviously with strain rate at room temperature and stabilizes at a level with slightly decrease at elevated temperature. The dynamic compressive strength of concrete at 400 °C increases by nearly 14% compared to the room temperature. However, it decreases at 200 °C, 600 °C and 800 °C with the decrease ratio of 20%, 16% and 48%, respectively. The dynamic elastic modulus decreases largely subjected to elevated temperature. The specific energy absorption at 200 °C, 400 °C and 600 °C is higher than room temperature and decreases to be lower than room temperature at 800 °C. Formulas are established under the consideration of mutual effect of strain rate and temperature. |
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| Keywords: | Concrete Elevated temperature Strain rate Compressive strength Elastic modulus |
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