Experimental study on the effect of anti-corrosive coatings on bond behavior of corroded rebar

Mohammad Ridduhan L. Natino*, Yizhou Yang, Hikaru Nakamura, Taito Miura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This research presents the investigation of the effect of anti-corrosive coatings on the bond behavior of corroded rebar to concrete. Cementitious and epoxy types of anti-corrosive coating materials have been considered and applied manually to rebar as the actual on-site repair procedure of corrosion-induced damaged reinforced concrete (RC) structure. Test specimens prepared were served to investigate the direct effect of coating materials and their combined effects with corrosion. Accelerated electric corrosion test was employed with a target degree of corrosion ranging from 5 to 10%. Laser scanning test was conducted to evaluate and quantify the changed on geometrical properties and surface roughness condition of the sound-coated, bare corroded, and corroded-coated rebar specimens. Finally, two end pull-out tests were conducted to measure the bond-slip relationship, ultimate bond strength, bond toughness and bond ductility. As an important finding, the anti-corrosive coating materials had a significant effect on the change of geometrical properties and surface roughness condition of deformed rebar that have a direct effect on bond behavior and mechanism. Cementitious coating compromised the relative rib area of rebar but enhanced its surface roughness, while epoxy coating maintained the relative rib area of rebar but compromised its surface roughness. Consequently, cementitious coated rebars provide the good bond performance regardless of corrosion degree compared to epoxy coated rebars.

Original languageEnglish
Article number121716
JournalConstruction and Building Materials
Volume274
DOIs
Publication statusPublished - 2021 Mar 8

Keywords

  • Bond-slip behavior
  • Cementitious coating
  • Corrosion
  • Epoxy coating
  • Rebar geometry
  • Rebar surface roughness

ASJC Scopus subject areas

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

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