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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
View graph of relations

Author(s)

  • Zhi-Hao Hao
  • Jun-Jie Zeng
  • Guang-Ming Chen
  • Jian-Guo Dai
  • Jian-Fei Chen

Detail(s)

Original languageEnglish
Article number117681
Journal / PublicationEngineering Structures
Volume305
Online published28 Feb 2024
Publication statusPublished - 15 Apr 2024

Abstract

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. © 2024 Elsevier Ltd.

Research Area(s)

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

Citation Format(s)

Durability of FRP-to-concrete bonded joints subjected to 110 months accelerated laboratory and field exposure. / Hao, Zhi-Hao; Zeng, Jun-Jie; Chen, Guang-Ming et al.
In: Engineering Structures, Vol. 305, 117681, 15.04.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review