Experimental study on the time-dependent dynamic mechanical behaviour of C60 concrete under |
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Authors: | LI Hong-chao LIU Dian-shu ZHAO Lei Greg YOU LIANG Shu-feng WANG Yu-tao |
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Affiliation: | 1. School of Mechanics and Civil Engineering,China University of Mining and Technology (Beijing),Beijing 100083,China;2. Faculty of Science and Technology,Federation University Australia,University Drive,Mt Helen,Ballarat,Victoria 3353,Australia |
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Abstract: | To study the dynamic mechanical behavior of C60 concrete at high temperatures, impact tests under different steady-state temperature fields (100, 200, 300, 400 and 500.℃) were conducted under a variety of durations at the corresponding constant high temperature, namely 0, 30, 60, 90 and 120.min, employing split Hopkinson pressure bar (SHPB) system. In addition, the impact tests were also conducted on the specimens cooled from the high temperature to the room temperature and the specimen under room temperature. From the analysis, it is found that C60 concrete has a time-dependent behavior under high-temperature environment. Under 100, 200, 300, 400 and 500.℃ steady-state temperature fields respectively, as the duration at the corresponding constant high temperature increases, the dynamic compressive strength and the elastic modulus decrease but the peak strain generally ascends. After cooling to the room temperature, the dynamic compressive strength and the elastic modulus descend as well, but the peak strain increases first and then decreases slightly, when the duration increases. For specimens under and cooled from the high-temperature, as the temperature increases, the dynamic compressive strength and the peak strain raise first and then reduce gradually,and the dynamic compressive strength of specimen under high temperature is higher than that of the specimen cooled from the same high temperature. |
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Keywords: | concrete SHPB high temperature dynamic mechanical behavior |
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