Uniform and Local Corrosion Characterization and Modeling Framework for Long-Term Exposure of Different Rebars Used for RC Elements in the Presence of Chloride Conditions

Narayanan, Deeparekha; Lü, Yi; Okeil, Ayman M.; Castaneda, Homero

doi:10.1007/978-3-030-91877-4_90

Cited by 1 publication

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“…The samples were then cleaned with DI water and, ethanol, and air dried. The samples were then processed with a similar method to that in our previous work: they were observed under a microscope to assess the distribution of localized attack with the distance from a fixed reference point and, cut at that distance; the pits distributed in the cross section area were observed, as shown in Figure 2 [32]. An Olympus DXS 500 optical microscope (Olympus Corporation, Tokyo, Japan) was then used to identify the localized attack on the slides and the corresponding depth of the attack into the substrate.…”

Section: Surface Characterizationmentioning

confidence: 99%

Electrochemical Evolution of Carbon Steel and Fe-9% Cr Steel Rebar in Simulated Concrete Pore Solution (SCPS) in the Presence of 3.5 wt% NaCl

Lü

Narayanan

Brooks

et al. 2022

CMD

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Carbon steel rebar (ASTM A615) has been widely used in reinforced concrete (RC), but its susceptibility to chloride ions remains a critical issue. Low alloy chromium steel has been used to increase corrosion resistance and extend service life, such as in 9% Cr rebar (ASTM A1035-CS). In this work, we characterized two electrochemical systems over time: ASTM A615 and A1035-CS corrugated rebar immersed in SCPS in the presence of NaCl for 12 months. The interfacial processes evolution for the ASTM A1035-CS rebar for both general and local corrosion showed different active-passive responses from those of carbon steel. Because the 3.5% wt. NaCl exceeded the chloride threshold for passive breakdown of both materials, the ASTM A1035-CS showed a five-fold higher impedance and lower general corrosion rate. In localized conditions, the low alloy chrome content rebar showed less density localized attack than the ASTM A615 rebar. These results were attributed to the overall damage evolution involving the formation and stability of corrosion products over time. The local attack appeared to be a random spatial process due to changes in the local environment.

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Section: Surface Characterizationmentioning

confidence: 99%