Experimental research on refractory performance of reinforced concrete beams strengthened with CFRP sheets bonded with an inorganic adhesive
ZHENG Wen-zhong, WAN Fu-xiong, LI Shi-guang
School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China
Abstract:
To meet the requirement of fire endurance for concrete structures strengthened with CFRP sheets, this study develops an inorganic adhesive whose strength at 600 ℃ is not lower than that at normal room temperature. The inorganic adhesive is then used to bond CFRP sheets on reinforced concrete beams in order to strengthen them. The fire protection of the CFRP sheets is done using the thick-type fireproofing coatings for tunnel (TFCT) and steel structure (TFCSS) respectively. Four specimens are tested in the furnace together. Specimens are exposed to fire for 1. 5 h in according to the ISO834 standard fire curve,and then naturally cooled for 1 h. In the tests,the largest displacements at the mid-span positions of specimens are only from 1 /1400 to 1 /318 of actual span corresponding to the highest temperatures from 300 ℃ to 470 ℃. After the specimens are naturally cooled to the normal temperature and the fireproofing coatings are then removed,it can be seen that the CFRP sheets keep in a good state,which indicates that CFRP sheets can be tightly bonded on the concrete and work well together with the concrete beams during and after fire. Besides,the tests also verify that the fire performance of TFCT is superior to TFCSS for the strengthened beams.
Key words: fire performance reinforced concrete beam CFRP sheets fireproofing coating test
DOI：10.11916/j.issn.1005-9113.2010.04.025
Clc Number:TU375.1
Fund:
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Experimental research on refractory performance of reinforced concrete beams strengthened with CFRP
本站小编 哈尔滨工业大学/2019-10-23
相关话题/Experimental research refractory performance reinforced
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