Bond-slip behavior between CFRP sheets and heat-damaged concrete

被引：0
|
作者：
Liu G. [1 ,2 ]
Qu F. [1 ,2 ]
Zhao S. [1 ,2 ]
Zhang H. [1 ]
机构：
[1] School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou
[2] Henan Province International United Lab of Eco-building Materials and Engineering, North China University of Water Resources and Electric Power, Zhengzhou
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷 / 05期
关键词：
Bond behavior; Carbon fiber reinforced polymer (CFRP); Concrete; Heat damaged; Static test; Ultimate strength;
D O I：
10.14006/j.jzjgxb.2019.05.016
中图分类号：
学科分类号：
摘要：
To investigate the bond behavior of exposing concrete to elevated temperatures with carbon fiber reinforced polymer (CFRP) sheets, the single-shear test was carried out. The specimens were initially heated to temperatures of 200℃, 300℃, 400℃ and 500℃. After cooling in the air, the heat-damaged specimens were subsequently bonded with CFRP sheets with various bond lengths (80, 120, 160 mm and 200 mm). The effects of elevated temperatures and bond length on the bond behavior between heat-damaged concrete and CFRP sheets were investigated. Test results show that all test specimens fail due to debonding in concrete adjacent to concrete-adhesive interface. Moreover, the amount of the concrete spalled with the debonded CFRP increases as the temperature increases. The ultimate bond strength between CFRP and the heat-damaged concrete increases at first and then decreases along the increase of temperatures. However, the residual bond strength was higher than that of the reference specimens as temperature less than 500℃. Finally, a model was proposed to estimate the bond strength between CFRP and heated concrete when the exposure temperature was not more than 600℃. And its validity was established by comparing the calculated bond strength with the measured values of a series of specimens tested by the authors and other researchers. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
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页码：156 / 162
页数：6
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