期刊
APPLIED THERMAL ENGINEERING
卷 106, 期 -, 页码 1200-1208出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2016.06.107
关键词
High temperature; Calcareous-aggregate concrete; Uniaxial compressive strength; Acoustic emissions
资金
- Fundamental Research Funds for Central Universities [2015XKMS033]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
In order to investigate the effect of high temperature (25-800 degrees C) on mechanical properties of concrete, uniaxial compression test is carried out to study the relationship between compressive strength and temperature, and the crack development in concrete specimen is monitored based on the acoustic emission (AE) phenomenon to reflect the change of internal cracks of concrete specimen under load. The test results show that the compressive strength of concrete is not obvious when the temperature is below 400 degrees C, but decreases with the increase of temperature and to 20% of that at room temperature when the temperature reaches 800 degrees C. The AE activity in the whole loading process and the cumulative counts and AE energy increase sharply to the critical point C until the specimens are completely damaged. The higher the temperature is, the more seriously the specimens are damaged and the less the acoustic emission signal is generated at the dynamic loading stage. (C) 2016 Elsevier Ltd. All rights reserved.
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