Axial compression performance test of concrete⁃filled GFRP tube columns in freezing⁃thawing environment

doi:10.19491/j.issn.1001-9278.2023.01.012

Abstract

Abstract:

The purpose of this study is to evaluate the effects of different freeze⁃thaw agents and freeze⁃thaw cycles on the axial compression performance of concrete⁃filled GFRP tube columns. A freeze⁃thaw cycle experiment and an axial compression experiment were conducted on 21 concrete⁃filled GFRP tube columns and 21 plain concrete columns in aqueous solution and NaCl solution with a mass fraction of 3.5 %. The ultrasonic experiment for the concrete⁃filled GFRP tube columns after freeze⁃thaw cycles was also performed. The results indicated that the mass loss rate and abnormal points of the GFRP tube columns increased with an increase in the freeze⁃thaw cycles in the same freeze⁃thaw agents， whereas the relative dynamic modulus， bearing capacity， and ultimate strain decreased. At the same freeze⁃thaw cycle numbers， the GFRP tubular columns showed a more significant decrease in the axial ultimate compressive strength after exposed to a saline environment. The GFRP tube columns also presented a decrease in the ultimate compressive strength by 29.45 % after 150 saline freezing⁃thawing cycles. This result is 2.19 times in water under the same conditions. The ultimate strain of the concrete⁃filled GFRP tube columns after the salt freezing cycle was less than that after the water freezing cycle under the same conditions.

Key words: freeze?thaw cycle, chlorine salt environment, concrete?filled GFRP tube column, axial compression perfor?mance, ultimate strain

CLC Number:

TQ327.1

GAO Yonghong, CHEN Lingfeng, JIN Qingping. Axial compression performance test of concrete⁃filled GFRP tube columns in freezing⁃thawing environment[J]. China Plastics, 2023, 37(1): 74-81.

Figures/Tables 14

Fig.1. Shape and size of the specimen

试件编号	SD/个	WD/个	YD/个
GZ⁃0	-	3	-
GZ⁃50	3	-	3
GZ⁃100	3	-	3
GZ⁃150	3	-	3
SZ⁃0	-	3	-
SZ⁃50	3	-	3
SZ⁃100	3	-	3
SZ⁃150	3	-	3

Tab.1. Specimen grouping

Fig.2. Ultrasonic test of concrete⁃filled GFRP tube column

Fig.3. Appearance of concrete⁃filled GFRP tube columns with and without freeze⁃thaw cycles

Fig.4. Appearance of plain concrete columns under different freeze⁃thaw agents and freeze⁃thaw cycles

Fig.5. Variation curve of average mass loss rate of the specimen

Fig.6. Variation curve of average relative dynamic elastic modulus of the specimen

Fig.7. Average number of abnormal points of concrete⁃filled GFRP tube column/point

Fig.8. Failure modes of SD⁃GZ⁃150 specimen

Fig.9. Failure modes of YD⁃GZ⁃150 specimen

Fig.10. Failure modes of YD⁃SZ⁃50 specimen

Fig.11. Average ultimate compressive strength of the specimens

Fig.12. Load⁃strain curves under different times of freeze⁃thaw cycles

Fig.13. Average load⁃circumferential strain

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