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

Daniel Borrie, Xiao Ling Zhao, R. K. Singh Raman, Yu Bai

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review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.

Conference

ConferenceJoint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures, FRPRCS 2015 and the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures, APFIS 2015
Country/TerritoryChina
CityNanjing
Period14/12/1516/12/15

Keywords

  • CFRP
  • Composite
  • Durability
  • Extreme environment
  • Fatigue
  • Seawater

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • General Materials Science

Fingerprint

Dive into the research topics of 'Bond durability of fatigued CFRP/steel double lap joints protected with chemical silane exposed to marine environments'. Together they form a unique fingerprint.

Cite this