CFRP strengthened pre-cracked steel plates protected with chemical silane exposed to extreme 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 recently investigated to retrofit degrading steel structures. One application being to prevent crack growth in fatigue damaged steel. Unfortunately, despite having the ability to increase the fatigue life of steel, applications have limited studies under industrial conditioning such as elevated temperature and marine exposure. This paper evaluates the durability of adhered CFRP patches design to restrict crack propagation in steel. In particular focussing on the use of epoxy adhesives and silane chemical barriers to restrict environmental ingress and improve fatigue life. CFRP patched pre-cracked steel plates were experimentally tested with combinations of epoxy adhesives and chemical barriers. Samples experienced ongoing static service loading while submerged in 5% NaCl solutions of varying temperatures. After removal, samples were fatigue loaded until failure. Comparing exposed and unexposed samples quantified the impact environmental conditioning has on the fatigue life of CFRP strengthened steel plates. Three layers of CFRP sheeting successfully increased the fatigue life of all specimens, even after environmental exposure. All, except two, double side patched specimens witnessed a run out, suggesting mild levels of degradation caused during submergence. Araldite 420 consistently gave longer fatigue lives due to the ability of the adhesive to saturate fibres easily and consistently. Single sided repairs showed life extensions of 2.29 and 3.85 for Araldite 2014 and Araldite 420 controls
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

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

Cite this

Borrie, D., Zhao, X. L., Singh, R. R. K., & Bai, Y. (2015). CFRP strengthened pre-cracked steel plates protected with chemical silane exposed to extreme 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.