1. Research Institute of Highway, Ministry of Transport, Beijing 100088, China;
2. School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China
Effect of Moisture Content and Fiber on the High-temperature Properties of Tunnel Second Lining Concrete
WANG Ru-yi1,2, YAN Qian-qian1,2, TIAN Bo1, XIE Jin-de1
1. Research Institute of Highway, Ministry of Transport, Beijing 100088, China;
2. School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China
摘要The critical moisture content of concrete with different fibers and the quality loss of different moisture contents are analyzed by simulating the real heating curve of the building material in a fire, and a fire test on the concrete slab is conducted. Results show that (1) moisture content greatly influences the surface burst degree, number of cracks, time of water seepage, and quality loss of the specimen after a fire; (2) the critical moisture content of fireproof fiber concrete burst is higher than that of three other kinds of concrete (normal concrete, polyethylene fiber concrete, and polypropylene fiber concrete), and has the highest crack resistance; and (3) the observation of fire spalling and the burn crisp degree of the concrete slab with the same moisture content verified that the fireproof fiber has a better anti-burst effect. Testing the post-fire side face of concrete slabs and the regional rebound value show that rebound value losses are not the same because of different temperature distributions on the side faces of the concrete slabs. The loss of mechanical property of the concrete is related to the temperature field.
Abstract:The critical moisture content of concrete with different fibers and the quality loss of different moisture contents are analyzed by simulating the real heating curve of the building material in a fire, and a fire test on the concrete slab is conducted. Results show that (1) moisture content greatly influences the surface burst degree, number of cracks, time of water seepage, and quality loss of the specimen after a fire; (2) the critical moisture content of fireproof fiber concrete burst is higher than that of three other kinds of concrete (normal concrete, polyethylene fiber concrete, and polypropylene fiber concrete), and has the highest crack resistance; and (3) the observation of fire spalling and the burn crisp degree of the concrete slab with the same moisture content verified that the fireproof fiber has a better anti-burst effect. Testing the post-fire side face of concrete slabs and the regional rebound value show that rebound value losses are not the same because of different temperature distributions on the side faces of the concrete slabs. The loss of mechanical property of the concrete is related to the temperature field.
基金资助:Supported by the Project of Science and Technology Department of Guangxi Zhuang Autonomous Region (No.1298011-3)
通讯作者:
WANG Ru-yi, E-mail:1099882336@qq.com
E-mail: 1099882336@qq.com
引用本文:
王如意, 闫倩倩, 田波, 谢晋德. 含湿量和纤维对隧道二衬混凝土高温性能的影响[J]. Journal of Highway and Transportation Research and Development, 2015, 9(3): 63-68.
WANG Ru-yi, YAN Qian-qian, TIAN Bo, XIE Jin-de. Effect of Moisture Content and Fiber on the High-temperature Properties of Tunnel Second Lining Concrete. Journal of Highway and Transportation Research and Development, 2015, 9(3): 63-68.
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