温度老化对GFRP/BFRP筋残余弯曲性能的影响

doi:10.11896/cldb.19070030

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Abstract This paper experimentally studied the bending performance of glass/basalt fiber reinforced polymer (GFRP/BFRP) bars after temperature aging treatment, mainly studying the effects of different operating temperature and constant temperature time on the bending performance of two types of FRP bars with different diameters, and scanning electron microscopy (SEM) was used to analyze the microstructure changes and damage mechanism of GFRP/BFRP bars after temperature aging treatment. The test and analysis results indicate that: Ⅰ. The bending strength and maximum strain of GFRP/BFRP bars tend to decrease gradually with increasing temperature after temperature aging treatment, while the bending elastic modulus does not deteriorate significantly and its retention rates are above 90%. Ⅱ. The bending performance of the GFRP bars with larger diameter is obviously degenerated after temperature aging treatment; and the bending performance retention degradation curve of G12 bars is higher than that of B12 bars, indicating that the bending performance of BFRP bars are more sensitive to operating temperature. Ⅲ. In the high temperature environment of 270 ℃, the bending strength of GFRP/BFRP bars tends to decrease linearly with the increase of constant temperature time. Ⅳ. Combined with the test results and SEM microstructural analysis, it can be considered that the main reasons for the degradation of bending strength of two types of FRP bars after temperature aging treatment are the synergistic effect between fiber and resin matrix and the significant decrease of fiber-resin matrix interface performance. Finally, combined with the experimental results of this paper, after temperature aging treatment the calculation model of the bending strength degradation of GFRP/BFRP bars and the linear interpolation prediction method were given to be within 500 ℃, which is convenient for practical engineering applications.

Key words： after temperature aging treatment glass/basalt fiber reinforced polymer (GFRP/BFRP) bars residual bending performance scanning electron microscope (SEM) reduction factor

Published: 23 February 2021

CLC number:

TU502+.6

Fund:This work was financially supported by the National Natural Science Foundation of China (51578267, 51878319, 51608235), Supported Project for Selection and Training of High-level Talents in “Six Talents Peaks” of Jiangsu Province (2015-JZ-008).

Corresponding Authors: lch79@ujs.edu.cn

About author:: Ke Xu is pursuing a master's degree at the Faculty of Civil Engineering and Mechanics of Jiangsu University under the guidance of Professor Chunhua Lu, majoring in architecture and civil engineering, focusing on the research of the performance of FRP bars reinforced concrete structure.
Chunhua Lu is currently a professor and Ph.D. supervisor at the Faculty of Civil Engineering and Mechanics of Jiangsu University. In June 2011, he received his Ph.D. in structural engineering from Zhejiang University. His research interests are the basic performance and durability of concrete structure, and the performance of FRP bars reinforced concrete structure.

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	XU Ke
	LU Chunhua
	XUAN Guangyu
	NI Mingzhi
	ZHANG Lingling
	ZHOU Jun
	XU Rongjin

Cite this article:

XU Ke,LU Chunhua,XUAN Guangyu, et al. Effect of Temperature Aging on Residual Bending Performance of GFRP/BFRP Bars[J]. Materials Reports, 2021, 35(4): 4053-4060.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19070030 OR http://www.mater-rep.com/EN/Y2021/V35/I4/4053

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