FRP-concrete bond performance under accelerated hygrothermal conditions

Faisal M. Mukhtar, Abheetha Peiris

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Drawing on information obtained via double lap shear tests, this paper discusses FRP-concrete bond behavior following five weeks of exposure to several accelerated hygrothermal conditions. Material tests were also carried out for both dry carbon fibers and the epoxy used in the bond study under similar hygrothermal conditions. The bond-slip relationship for the hygrothermal conditions were developed, and fracture energy calculated for the FRP-concrete bond. The use of degraded material properties obtained from material test coupons under the same exposure conditions prevented overestimation of the FRP-concrete bond fracture energy. Testing revealed that the FRP-concrete bond strength increased as temperature increased at low humidity (dry heat) — a potential consequence of alteration in the epoxy glass transition temperature. The bond strength of concrete with steel slag incorporated was superior at all temperatures and low humidity. In response to continuous or periodic submergence in water, specimen failure mode transitioned from substrate failure to adhesive-concrete interface failure. Alternating two-day wet/dry cycles resulted in a 12% drop of FRP-concrete bond strength. Under low humidity, the FRP dry fiber tensile stress increased as temperature increased (dry heat), while the opposite dynamic was observed in the epoxy coupons.

Original languageEnglish
Article number121403
JournalConstruction and Building Materials
Volume270
DOIs
StatePublished - Feb 8 2021

Bibliographical note

Funding Information:
The authors would like to acknowledge the financial support provided by the Deanship of Scientific Research at King Fahd University of Petroleum & Minerals (KFUPM) under Research Grant IN161031 . The help provided by the Civil Engineering Structural Laboratory engineers and the support of Mechanical Engineering Department are highly appreciated. The support of Dr. Christoper Van Dyke (Kentucky Transportation Center, USA), and that of Messrs Romeo Agua (KFUPM) and Rayhan Faysal are also acknowledged.

Funding Information:
The authors would like to acknowledge the financial support provided by the Deanship of Scientific Research at King Fahd University of Petroleum & Minerals (KFUPM) under Research Grant IN161031. The help provided by the Civil Engineering Structural Laboratory engineers and the support of Mechanical Engineering Department are highly appreciated. The support of Dr. Christoper Van Dyke (Kentucky Transportation Center, USA), and that of Messrs Romeo Agua (KFUPM) and Rayhan Faysal are also acknowledged.

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Bond strength
  • Concrete
  • Epoxy
  • FRP
  • Hygrothermal effect

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (all)

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