Effect mechanism of temperature on the interface properties of CFRP-steel bondedby self-developed adhesive

LI Chuanxi; GAO Youwei; WANG Xiaoyao; LI You; SIDU Yinghu

doi:10.13801/j.cnki.fhclxb.20230614.006

Volume 41 Issue 2

Feb. 2024

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LI Chuanxi, GAO Youwei, WANG Xiaoyao, et al. Effect mechanism of temperature on the interface properties of CFRP-steel bondedby self-developed adhesive[J]. Acta Materiae Compositae Sinica, 2024, 41(2): 925-936. doi: 10.13801/j.cnki.fhclxb.20230614.006

Citation:

LI Chuanxi, GAO Youwei, WANG Xiaoyao, et al. Effect mechanism of temperature on the interface properties of CFRP-steel bondedby self-developed adhesive[J]. Acta Materiae Compositae Sinica, 2024, 41(2): 925-936. doi: 10.13801/j.cnki.fhclxb.20230614.006

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Effect mechanism of temperature on the interface properties of CFRP-steel bondedby self-developed adhesive

doi: 10.13801/j.cnki.fhclxb.20230614.006

LI Chuanxi^{1, 2},
GAO Youwei^{1
,
,},
WANG Xiaoyao¹,
LI You³,
SIDU Yinghu¹

1.
School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China
2.
School of Civil Engineering and Architecture, Guangxi University, Nanning 530005, China
3.
College of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China

Funds: National Natural Science Foundation of China (51778069); Natural Science Foundation of Hunan Province (2021JJ40173); Key Research and Innovation Project for Graduate Students of Hunan Province (QL20210180)

Received Date: 2023-04-07
Accepted Date: 2023-06-03
Rev Recd Date: 2023-05-24

Available Online: 2023-06-15

Publish Date: 2024-02-01

Abstract

Abstract

Bonding interface is the weak link of carbon fiber reinforced polymer (CFRP) reinforced steel structure, which is significantly affected by adhesive and temperature. In order to investigate the effect of temperature on the interfacial properties of CFRP-steel bonded by a self-developed high-performance adhesive, 28 CFRP-steel double lap specimens were prepared. The tensile shear tests of self-developed high-performance adhesive G3 and typical commercial adhesive Sika30 were carried out at 7 ambient temperatures (−20℃, −5℃, 10℃, 25℃, 40℃, 55℃ and 70℃). The failure mode, ultimate bearing capacity, load-displacement curve, interface shear stress and bond-slip curve of the specimens were analyzed. The results show that the strength of the adhesive decreases and the toughness increases with the increase of temperature. When the temperature is close to or exceeds the glass transition temperature of the adhesive, the colloidal performance decreases sharply, and the failure mode of the lap joint specimen changes from CFRP layer separation failure to steel-adhesive interface failure, and the interface performance decreases significantly. The low temperature performance of G3 specimen is comparable to that of Sika30 specimen, but the high temperature performance of G3 adhesive specimen is significantly better than that of Sika30 adhesive specimen. The interface performance of the specimen at low temperature is significantly lower than that at 25℃. The adverse effects of brittleness of the reinforcement system at low temperature should be considered in the steel structure strengthened with adhesive CFRP.
- bridge reinforcement,
- interface performance,
- high performance adhesive,
- ambient temperature,
- bond-slip relationship
Long Abstrsct
Innovation Points

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References(30)

References

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