Steel rebars are widely applied in reinforced concrete structures due to their contribution to significant improvements in mechanical properties. However, the exposure to corrosive environments, such as solution containing chloride, may induce accelerated corrosion and jeopardize the sustainability and durability of reinforced concrete. The current work evaluated the chloride thresholds (in both wt% and [Cl-]/[OH-]) of steel rebar with different chromium contents (0, 4, and 23wt%) in synthetic concrete pore solution (SCPS) based on AC and DC electrochemical measurements, and chemical and structural characterizations. The study found thar the CT values varied slightly based on the different measurement methods and the values were compared with values obtained from the literature. The values are 0.01-0.1wt% (3.76), 0.1-1wt% (>23.8), and 2.9-3.5wt% (>23.8) for 615, 4% Cr, and SS23, respectively, where the values in parentheses are [Cl-]/[OH-]. Therefore, it is demonstrated that multiple measurements are necessary to determine a reliable CT value. Corrosion mechanisms giving rise to CT are included to illustrate the processes involved in establishing CT.
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Research Article|
March 06 2023
Determination of Chloride Threshold of Cr-based Steel Rebars in Synthetic Concrete Pore Solution (SCPS) based on Electrochemical Methods
Yi Lu;
Yi Lu
Y Lu Materials Science and Engineering,
Texas A&M University System
, College Station, United States
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Deeparekha Narayanan;
Deeparekha Narayanan
D Narayanan Materials Science and Engineering,
Texas A&M University System
, College Station, United States
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Changkyu Kim;
Changkyu Kim
C Kim Material Science and Engineering,
Texas A&M University College Station
, College Station, 77843, United States
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Digby D. Macdonald;
Digby D. Macdonald
D Macdonald Nuclear Engineering,
University of California at Berkeley
, Berkeley, 94720, United States
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Homero Castaneda
H Castaneda Materials Science and Engineering,
Texas A & M University
, College Station, 77843, United States
Correspondence: Homero Castaneda, Email: hcastaneda@tamu.edu
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CORROSION 4236:.
Article history
Received:
November 03 2022
Revision Received:
March 05 2023
Accepted:
March 06 2023
Citation
Yi Lu, Deeparekha Narayanan, Changkyu Kim, Digby D. Macdonald, Homero Castaneda; Determination of Chloride Threshold of Cr-based Steel Rebars in Synthetic Concrete Pore Solution (SCPS) based on Electrochemical Methods. CORROSION 2023; 4236:. doi: https://doi.org/10.5006/4236
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