Bond durability of fatigued CFRP/steel double lap joints protected with chemical silane exposed to marine environments

Daniel Borrie, Xiao Ling Zhao, Raman Raghuvir Kumar Singh, Yu Bai

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Carbon fibre reinforced polymers (CFRP) have been widely researched in recent times, especially for the retrofitting of steel structures. Unfortunately, despite having great advantages in strengthening steel, many studies have shown that when the CFRP-steel bond is subjected to harsh environmental conditions, bond durability reduces. This study explores the use of silane chemical barriers to retard environmental damage and restrict bond degradation. The study experimentally tested steel-CFRP double-lap specimens prepared with combinations of epoxy adhesives and retarding barriers. Samples experienced ongoing static service loading while submerged in 5% NaCl solutions of varying temperatures. After immersion for different durations, samples were fatigue loaded for a set number of cycles, after which, static failure loads were determined. Comparing tensile bond strengths quantified the impact that environmental conditioning, fatigue loading and retarding barriers have on the bond durability of CFRP to steel.
For specimens prepared with Araldite 420 adhesive, silane coatings caused up to 26 % reductions in bond strength; however Araldite 2014 commonly showed improved strengths after silane applications. Furthermore Araldite 420’s lower glass transition temperature (Tg) best suited low temperature exposures, while Araldite 2014 better withstood degradations caused by high temperature submergence. Overall it would seem that silane coatings are best suited when long-term exposures are expected.
Original languageEnglish
Title of host publicationJoint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) & the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015)
EditorsZhishen Wu, Gang Wu, Xin Wang
Place of PublicationNanjing China
PublisherSoutheast University
Pages1 - 6
Number of pages6
Publication statusPublished - 2015
EventInternational Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS) & the Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS) - Nanjing, China
Duration: 14 Dec 201516 Dec 2015
http://www.iifc.org/proceedings/APFIS_2015/Content.pdf

Conference

ConferenceInternational Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS) & the Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS)
Abbreviated titleFRPRCS-12/APFIS-2015
CountryChina
CityNanjing
Period14/12/1516/12/15
OtherJoint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) & the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015)
Internet address

Keywords

  • Durability
  • Fatigue
  • CFRP
  • Seawater
  • Composite
  • Extreme
  • Environment

Cite this

Borrie, D., Zhao, X. L., Singh, R. R. K., & Bai, Y. (2015). Bond durability of fatigued CFRP/steel double lap joints protected with chemical silane exposed to marine environments. In Z. Wu, G. Wu, & X. Wang (Eds.), Joint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) & the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015) (pp. 1 - 6). Nanjing China: Southeast University.