Performance of corrosion inhibitors in reinforced concrete elements under electrical voltage

Lapiro, I.; Mezhov, Alexander; Kovler, Konstantin

doi:10.1016/j.conbuildmat.2022.127656

Cited by 17 publications

(6 citation statements)

References 22 publications

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“…According to previous research, specimens with a protective layer on the reinforcing steel and surface produced more positive results than unprotected specimens [21-22, 24-25, 27]. Applying the coating directly to the surface of the mortar could cover the pores and cracks on the surface, providing additional protection against moisture and chloride intrusion [18][19][23][24]. The results of this research were in good agreement to the previous research phenomena.…”

Section: Corrosion Potential Of Steel Barsupporting

confidence: 88%

“…To prevent corrosion, several efforts have been made, one of which is to provide a protective coating for both the reinforcement and the concrete surface [9,17]. Corrosion inhibitor paint based by using a magnesium hydroxide layer was used to stabilize the pH of the concrete surface in previous efforts to prevent corrosion by providing a protective layer to the concrete surface [18][19]. The study results showed that using a magnesium hydroxide layer could keep the pH of the concrete surface stable, preventing the growth of microorganisms that cause corrosion [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion potential of coated steel bar embedded in sea-water mixed mortar

Astuti,

Zakri Radio,

Salsabila

et al. 2023

E3S Web Conf.

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Corrosion of embedded steel bars in concrete structures is the most impactful deterioration case in the world therefore many researchers and engineers are looking for the unknown mechanism related to the occurrence process, the effect of the damaged structures to its capacity and serviceability, and the intervention methods to control the rate of corrosion nowadays. One of the most prevalent liquid materials used in concrete is freshwater. However, the lack of freshwater for basic requirements in certain regions necessitates the adoption of an alternate material. Seawater, abundant in Indonesia, has the ability to substitute freshwater in concrete mixtures. However, its high concentration of chloride ions might raise the risk of corrosion in reinforced concrete structures. The laboratory experiment was proposed to find the empirical test result of the performance of corrosion prevention to the seawater mix RC structures. Three type of cements (PPC, PCC, and PPC-PCC mixture) were used as binder and two type of protection (steel coating and no coating) were applied in this research. One day after specimen casting, it were demolded and cured under water condition until 28 days. After that, the cylindrical and beams specimens were tested and the cubical specimens were exposed to three conditions (air-dry, wet, and dry-wet cycle) until a half-year and the half-cell potential test was conducted periodically every week. Based on the results, it demonstrated that the steel coating is the most suitable corrosion prevention method and PCC is recommended to maintain the corrosion potential stable to be passive.

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Section: Corrosion Potential Of Steel Barsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Corrosion potential of coated steel bar embedded in sea-water mixed mortar

Astuti,

Zakri Radio,

Salsabila

et al. 2023

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…To examine whether reaction products of NaCl were formed and to verify the chloride profile, XRD (X-ray diffraction) analysis, which is the most common technique for characterizing materials in the literature [ 48 ], was applied. The details of the specimen preparation and following XRD analysis were identical to those reported in previous work [ 49 ], namely: The samples were initially manually ground to achieve a particle size of less than 75 microns. The XRD analysis utilized a Malvern Panalytical EMPYREAN X-ray diffractometer under specific measurement conditions: a CuKα1,2 X-ray source (λ = 1.5406 Å), with the X-ray generator operating at 45 kV and 40 mA, and a Goniometer radius of 240 mm.…”

Section: Experimental Programmentioning

confidence: 99%

Degradation of RC Columns under Combined Exposure to Axial Loading, Stray Currents, and Chloride Ingress

Lapiro,

Eid,

Kovler

2024

Materials

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Coastal regions, home to a significant portion of the world’s population, confront a formidable challenge: the corrosive impact of chloride-rich environments on vital infrastructure. These areas often host essential transportation systems, such as trains and metros, reliant on pre-existing electrical infrastructure. Unfortunately, complete isolation of this infrastructure is rarely feasible, resulting in the emergence of stray currents and electrical potentials that expedite corrosion processes. When coupled with conducive mediums facilitating chemical electrocell formation, the corrosion of reinforced concrete elements accelerates significantly. To combat this issue, international standards have been established, primarily focusing on augmenting the thickness of reinforcement bar covers and restricting stray voltage between rails and the ground. Nevertheless, these measures only provide partial solutions. When subjected to service loads, these elements develop cracks, especially when exposed to stray currents and chlorides, dramatically increasing corrosion rates. Corrosion products, which expand in volume compared to steel, exert internal forces that widen cracks, hastening the deterioration of structural elements. The study deals with the degradation of reinforced concrete columns under the combined action of loads, chloride-rich environments, and electrical voltage-simulating stray currents. In these conditions, degradation and reduction of load-bearing capacity accelerate compared to unloaded conditions, significantly amplifying the corrosion rate. Astonishingly, even in the absence of mechanical loads, stray currents alone induce tensile stresses in elements due to corrosion product formation, leading to longitudinal cracks parallel to the reinforcement bars.

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“…Concrete with chloride salts contains corrosion inhibitors, which are used in large buildings, coastal buildings, and bridges. − Chlorides have the ability to degrade concrete reinforcing steel. , Inside the alkalinity condition of concrete, ferrous oxide is persistent, but it combines with chloride ions to produce complexes that migrate away from the steel and promote rusting . The chloride ions continue to destroy the steel till the passivating oxide film is eliminated. , Corrosion inhibitor compounds chemically impede the corrosion operation. , Inorganic corrosion inhibitors that are commercially accessible include calcium nitrite, sodium nitrite, and phosphates .…”

Section: Introductionmentioning

confidence: 99%

Inhibitory Capabilities of Sweet Yellow Capsicum Extract toward the Rusting of Steel Rebars in Cement Pore Solution

Deyab

Mohsen

2023

ACS Omega

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The inhibitory capabilities of the sweet yellow capsicum extract (SYCE) toward the rusting of steel rebars in cement pore solution (CPS) were tested employing the electrochemical and mass loss methods. Gallic acid, caffeic acid, p-coumaric acid, ferulic acid, luteolin, and cinnamic acid are the most important constituents in the SYCE extract. By adsorbing them on steel bars, the organic compounds in the CSA extract enable them with an effective mixed-type inhibition, suppressing both anodic and cathodic procedures. At 300 ppm, the highest performances were 95.3 and 97.5% utilizing mass loss and electrochemical approaches, respectively. The activation energy for the corrosion process is greatly increased by the addition of the SYCE extract, going from 13.2 kJ mol −1 (blank solution) to 30.0 kJ mol −1 (300 ppm SYCE extract). The physical adsorption actions of the SYCE extract are described by the Freundlich equilibrium constant's smallest value, which is 0.074 ppm −1 . Many future investigators will be attracted by these discoveries to work relentlessly to uncover the anticorrosion characteristics of novel plant extracts in the area of concrete additives.

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Performance of corrosion inhibitors in reinforced concrete elements under electrical voltage

Cited by 17 publications

References 22 publications

Corrosion potential of coated steel bar embedded in sea-water mixed mortar

Corrosion potential of coated steel bar embedded in sea-water mixed mortar

Degradation of RC Columns under Combined Exposure to Axial Loading, Stray Currents, and Chloride Ingress

Inhibitory Capabilities of Sweet Yellow Capsicum Extract toward the Rusting of Steel Rebars in Cement Pore Solution

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