Experimental Study on Thermal Expansion Behavior of Concrete under Three-Dimensional Stress

被引:3
作者
Yu, Zhipeng [1 ,2 ]
Zhang, Fan [1 ]
Ma, Xiao [2 ,3 ]
Yang, Fujian [2 ,3 ]
Hu, Dawei [2 ,3 ]
Zhou, Hui [2 ,3 ]
机构
[1] Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430064, Hubei, Peoples R China
[2] Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
MECHANICAL-PROPERTIES; CEMENT PASTE; COEFFICIENT; MODEL; STRENGTH;
D O I
10.1155/2021/5597918
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Concrete is widely used in underground engineering and bears three-dimensional stress transmitted by overlying load. When a fire occurs, the thermal expansion of concrete structure under such stress state is different from that under stress-free state. For this purpose, a self-developed real-time high-temperature true triaxial test system was applied to investigate the thermal expansion behavior of concrete under three-dimensional stress state. The thermal expansion strain of concrete under the three-dimensional stress undergoes strain increasing and strain stabilizing stages. At 600 degrees C, the maximum thermal expansion strain of concrete under the three-dimensional stress is 0.75%. The average coefficient of thermal expansion of concrete under three-dimensional stress condition was then calculated, and its value reaches the minimum of 8.68 x 10(-6)/degrees C at 200 degrees C and the maximum of 13.41 x 10(-6)/degrees C at 500 degrees C. Comparing the coefficient of thermal expansion of concrete under stress-free condition given by Eurocode, it is found that the three-dimensional stress has an obvious restraint on the thermal expansion of concrete. The research results can provide theoretical basis for the stability analysis of underground engineering concrete structures under high-temperature environment.
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页数:8
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