Temperature effect on bond performance between glass fiber reinforcement polymer bars and concrete

doi:10.19491/j.issn.1001-9278.2022.09.003

Abstract

Abstract:

The purpose of this study is to investigate the influence of temperature and heating/cooling modes （monotonous heating， cycle heating， monotonous heating⁃natural cooling， and monotonous heating⁃rapid cooling） on the bond performance between glass fiber reinforcement polymer （GFRP） bars and concrete. Totally 90 GFRP bars with a diameter of 10 mm and the concrete pull⁃out specimens with two bonded lengths were subjected to the tests at a temperature ranging from 20 to 220 ºC. Totally 54 concrete cubic specimens were used to measure their ultimate compressive and tensile strength under the same conditions. The results indicated that the bond performance between the GFRP bars and concrete tended to deteriorate seriously with an increase in temperature under the two heating modes. The influence of monotonous heating on the degradation of bond strength was more significant compared to cyclic heating at a temperature below 120 ºC. When the temperature exceeded 120 ºC， the effect of heating mode on the attenuation of bond performance decreased. Under the two cooling modes， the bond performance between the GFRP bars and concrete seemed not to degrade significantly with an increase in temperature during the monotone heating⁃natural cooling process， whereas there was an evident degradation under the monotonic heating⁃rapid cooling process.

Key words: glass fiber reinforcement polymer bar, bond performance, temperature effect, concrete

CLC Number:

TQ327.1

GAO Yonghong, PENG Mengmi, JIN Qingping. Temperature effect on bond performance between glass fiber reinforcement polymer bars and concrete[J]. China Plastics, 2022, 36(9): 16-23.

Figures/Tables 14

平均极限抗拉

强度/MPa

平均极限

应变/ε

平均拉伸弹性

模量/GPa

612.44

0.0134

53.04

Tab.1. Basic mechanical properties of GFRP bars

设计等级

水胶比

水/

kg·m^-3

水泥/

kg·m^-3

砂/

kg·m^-3

碎石/

kg·m^-3

Tab.2. Mix proportion of the concrete

Fig.1. Size of the pull⁃out specimen and concrete test block

黏结长度	温度/℃	试件数量
黏结长度	温度/℃	常温	单调升温	单调升温⁃ 自然冷却	单调升温⁃快速冷却	循环升温
4d	20	1×3
	0		1×3	1×3	1×3	1×3
	120		1×3	1×3	1×3	1×3
	170		1×3	1×3	1×3	1×3
	22		1×3	1×3	1×3	1×3
5d	20	1×3
	70		1×3	1×3	1×3
	120		1×3	1×3	1×3
	170		1×3	1×3	1×3
	220		1×3	1×3	1×3

Tab.3. The groups of GFRP bar concrete specimen

Fig.2. Reaction frame device

Fig.3. Compressive strength and tensile strength of the concrete

Fig.4. Pullout failure of GFRP bar and splitting failure of the concrete

Fig.5. Typical failure modes of specimen interface at different temperature

Fig.6. Surface crack observation of GFRP bars at 120 ℃

Fig.7. Variation of bond strength in three states of monotonic heating

Fig.8. Variation of bond slip in three states of monotonic heating

Fig.9. Variation of bonding performance with two heating methods

Fig.10. Bond stress⁃slip relationships with different heating（cooling） methods

Fig.11. Rate of change of bond stiffness with different heating（cooling）methods

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