Show simple item record

AuthorSohail, Muazzam G.
AuthorKahraman, Ramazan
AuthorAlnuaimi, Nasser A.
AuthorGencturk, Bora
AuthorAlnahhal, Wael
AuthorDawood, Mina
AuthorBelarbi, Abdeldjelil
Available date2023-02-15T10:16:34Z
Publication Date2020
Publication NameConstruction and Building Materials
ResourceScopus
URIhttp://dx.doi.org/10.1016/j.conbuildmat.2019.117205
URIhttp://hdl.handle.net/10576/40091
AbstractAn experimental study is carried out in this paper to evaluate the corrosion performance of mild steel reinforcing bars (MS), high strength steel reinforcing bars (HS), epoxy-coated steel reinforcing bars (EC), and high-chromium steel reinforcing bars (HC) under harsh environmental conditions. Reinforcing bars (rebar) of 16 mm diameter and 310 mm length were embedded in cylindrical concrete samples of 60 mm diameter and 350 mm length, and subjected to a Southern Exposure test for sixteen months. The open circuit potential (OCP) was monitored during the exposure period until corrosion initiation. The linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and Tafel plot techniques were employed to assess the corrosion rates on the rebar surfaces. The macrocell corrosion current was monitored by connecting the corroding rebar with an external stainless steel bar of the same size. The polarization resistance of the HC was found to be 1.5 times higher than that of the MS. The EIS technique showed that EC, even with damaged epoxy coating, has the highest resistance to chloride attack. The macrocell current of HC rebar was 48% less than that of MS during the active corrosion state. The LPR, EIS and Tafel plots analysis provided the current densities, which were close to each other; indicating the validity of these techniques to study the problem at hand. The corrosion rates from electrochemical methods were compared against the ones calculated by gravimetric methods. The quantitative results from this research may be used in service life prediction of concrete structures with different types of rebar. Extensive analysis of the results indicates that the corrosion resistance of the evaluated steels was in the following decreasing order: EC, HC, MS, and HS.
SponsorThe funding for this research was provided by the National Priorities Research Program of the Qatar National Research Fund (a member of the Qatar Foundation) under the award no. NPRP 7-410-2-169. The statements made herein are solely the responsibility of the authors and do not necessarily reflect the opinions of the Sponsor. Authors are also thankful to the Qatar Steel Company, Qatar Metals Coating Company, Mesaieed, Qatar, for providing the materials.
Languageen
PublisherElsevier
SubjectElectrochemical impedance spectroscopy
Epoxy coated rebar
High-chromium steel
Infrastructure durability
Mild steel
Reinforced concrete corrosion
TitleElectrochemical behavior of mild and corrosion resistant concrete reinforcing steels
TypeArticle
Volume Number232
dc.accessType Abstract Only


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record