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| Time effect experimental study of the concrete dynamic Mechanical property at high temperature |
| Li Hong-Chao1 Liu Dian-Shu1 Huang Yong-hui2 Liang Shu-Feng1 Li Ming-Hui1 |
1.School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083,China;
2.Faculty of Electic Power Engineering，Kunming University of Science and Technology，Kunming 650500, China |
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Abstract The aim of this paper is to investigate concrete dynamic mechanical properties at high temperature. In order to determine the concrete specimen heating time in different temperature groups, adopt the ANSYS software to simulate the temperature field during the heating process. Impact loading experiments were carried out on concrete at high temperature and different heating time by using a 75-mm-diameter split Hopkinson pressure bar (SHPB) apparatus and temperature control device. The results show that C60 concrete has obvious temperature effect and time effect. The dynamic compressive strength rises at first and then falls with increasing temperature and achieves the maximum at about 200℃, the peak strain rises with temperature increasing; Under 100℃, 200℃, 300℃, 400℃ and 500℃ steady-state temperature fields respectively, with increasing temperature, the dynamic compressive strength decreases and the peak strain rises and the elastic modulus decreases, and in the 500℃ steady temperature field, when the heating time being greater than 190 min, the dynamic compressive strength is tending towards stability and no longer decreases.
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Received: 16 July 2014
Published: 15 July 2015
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