Durability of FRP-to-concrete bonded joints subjected to 110 months accelerated laboratory and field exposure

Hao，Zhi Hao1,2; Zeng，Jun Jie3; Chen，Guang Ming4; Dai，Jian Guo1,5; Chen，Jian Fei2

2024-04-15

10.1016/j.engstruct.2024.117681

Engineering Structures   影响因子和分区

0141-0296

1873-7323

Externally bonded fiber reinforced polymer (FRP) composites have been widely used to strengthen existing reinforced concrete (RC) structures. The predominant failure mode in FRP-strengthened RC members is debonding, which is largely dependent on the performance of the FRP-to-concrete bond interface. The durability of FRP-to-concrete bond interfaces is therefore crucial to the safety of the strengthened structure. In this study, 84 FRP-to-concrete bonded joints were tested, with different types of FRP and adhesives, including carbon FRP (CFRP) plate with Sika30, CFRP plate with Araldite106, CFRP sheet with SW-3 C, and glass FRP (GFRP) sheet with Sika330. The performance of FRP-to-concrete bond interfaces and the corresponding materials (i.e., FRP, adhesives and concrete), were tested after 8 months, 18 months, 31 months, and 110 months exposure to the wet-dry cycling environment, and 48 months and 110 months exposure to the outdoor environment. The results show that the bonded joints subjected to the wet-dry cycling environment exhibited more significant degradation compared to those subjected to the outdoor environment. In the wet-dry cycling environment, the CFRP plate with Sika 30 and CFRP sheet with SW-3 C bonded joints exhibited better durability performance with only 3% and 9% reductions in bond strength after 110 months, respectively. In contrast, the CFRP plate with Araldite106 and GFRP sheet with Sika330 bonded joints exhibited larger reductions in bond strength of 36% and 48%, respectively. Furthermore, failure mode changes were observed as the exposure time increased.

CFRP Durability FRP-to-concrete interface GFRP Wet-dry cycling environment

SCI ; EI

英语

其他

ENGINEERING

2-s2.0-85186542826

Scopus

1.Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong,Hong Kong
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou,510006,China
4.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou,Guangdong Province,510641,China
5.Department of Architecture and Civil Engineering,City University of Hong Kong,Hong Kong,Hong Kong

Hao，Zhi Hao,Zeng，Jun Jie,Chen，Guang Ming,et al. Durability of FRP-to-concrete bonded joints subjected to 110 months accelerated laboratory and field exposure[J]. Engineering Structures,2024,305.

Hao，Zhi Hao,Zeng，Jun Jie,Chen，Guang Ming,Dai，Jian Guo,&Chen，Jian Fei.(2024).Durability of FRP-to-concrete bonded joints subjected to 110 months accelerated laboratory and field exposure.Engineering Structures,305.

Hao，Zhi Hao,et al."Durability of FRP-to-concrete bonded joints subjected to 110 months accelerated laboratory and field exposure".Engineering Structures 305(2024).