Influence of corrosion inhibitors in reinforced concrete – A state of art of review

Yuvaraj, S.; Nirmalkumar, K.; Kumar, Vikash; Gayathri, R.; Mukilan, K.; Shubikksha, S.

doi:10.1016/j.matpr.2022.09.118

Cited by 10 publications

(4 citation statements)

References 40 publications

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“…Corrosion begins with electron release at the anode, followed by their reaction with oxygen and water to form hydroxyl ions at the cathode [27]. Water and oxygen accelerate the corrosion process, leading to reactions between hydroxyl and iron ions that corrode the reinforcement [28], as shown in Equations ( 3)- (5). The variable 'n' in Equation ( 5) depends on the presence of water and oxygen.…”

Section: Corrosion Mechanismmentioning

confidence: 99%

Behavior and Performance of Reinforced Concrete Columns Subjected to Accelerated Corrosion

Hameed

Afzal

Javed

et al. 2023

Metals

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Steel reinforcement corrosion in concrete structures such as bridges, industrial plants, marine structures, and coastal buildings is a growing concern due to its impact on cost, safety, and serviceability. Corrosion leads to spalling, cracking, and reduced reinforcement diameter, which can compromise structural integrity. This study examines the behavior of concrete columns with corroded reinforcement in two phases. In the first phase, 72 columns of 150 × 150 mm cross-sectional dimensions and 300 mm length were cast and subjected to an accelerated corrosion technique. The study examined variables such as concrete cover, concrete strength, and corrosion exposure. The second phase involved studying the axial behavior of corroded columns concerning the effect of column length. Column specimens of 150 × 150 mm cross-sectional dimensions and lengths of 500 mm, 700 mm, and 900 mm were cast, corroded, and tested under axial compressive load. The study revealed that a 30 mm concrete cover offers 10% more protection against corrosion than a 20 mm cover. Continuous exposure to a corrosive environment reduces the load-carrying capacity by 50%, while columns with 28 MPa concrete strength can carry 4% more load. Longer columns are more susceptible to corrosion, leading to a significant reduction in load-carrying capacity and concrete cover damage. Therefore, maintaining adequate concrete cover, strength, and regular inspections are essential to address steel reinforcement corrosion and preserve structural integrity.

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Section: Corrosion Mechanismmentioning

confidence: 99%

Behavior and Performance of Reinforced Concrete Columns Subjected to Accelerated Corrosion

Hameed

Afzal

Javed

et al. 2023

Metals

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“…Additionally, De Schutter [4] considered early concrete degradation gravely damaging to the environment. The leading cause of degradation in reinforcement is corrosion due to the depassivation of the protective concrete layer from carbonation and/or the chloride ions [5]. In the Tuutti [6] model, degradation started from the initial penetration or propagation of these agents and was affected by temperature, humidity, and oxygen content.…”

Section: Introductionmentioning

confidence: 99%

Proposed variations in nominal reinforcement cover based on the environmental aggressivity class (EAC) of concrete exposure

Pacheco,

Ehrenbring,

Christ

et al. 2024

Rev. IBRACON Estrut. Mater.

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The physical and chemical protection of steel reinforcement afforded by the cover is a consequence of the quality of the concrete and its thickness, with a long-term impact on durability and service life. This study proposed variations in cover based on environmental aggressivity class (EAC) of exposure considering concretes of prescribed compressive strength classes (C20/C25/C30/C40). To this end, concrete mixtures were subjected to accelerated testing in salt spray chambers or carbonation. Accelerated testing was kept for periods long enough to reach each EAC cover level. Thus, the effect of each EAC, from mild to severe, was determined on the physical and mechanical characteristics of each mixture. It was determined that the required reinforcement cover varied linearly with compressive strength. This denoted the possibility of using more than one class of concrete and cover for each EAC. It should be noted that the difference in required cover became greater when using concrete with a strength class higher than C30. Still, it was noticed that the chloride ions attack s was more severe than carbonation and was, for most of the test cases, the determinant factor in minimum cover thickness to ensure the desired durability.

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“… 7 , 8 Corrosion inhibitor compounds chemically impede the corrosion operation. 9 , 10 Inorganic corrosion inhibitors that are commercially accessible include calcium nitrite, sodium nitrite, and phosphates. 11 Such inorganic chemicals are hazardous to the environment and are forbidden in many industries.…”

Section: Introductionmentioning

confidence: 99%

“…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 . Such inorganic chemicals are hazardous to the environment and are forbidden in many industries .…”

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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Influence of corrosion inhibitors in reinforced concrete – A state of art of review

Cited by 10 publications

References 40 publications

Behavior and Performance of Reinforced Concrete Columns Subjected to Accelerated Corrosion

Behavior and Performance of Reinforced Concrete Columns Subjected to Accelerated Corrosion

Proposed variations in nominal reinforcement cover based on the environmental aggressivity class (EAC) of concrete exposure

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

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