Steel Corrosion-Inhibiting Effect of Sodium Nitrate in Simulated Concrete Pore Solutions

Saura, P.; Zornoza, E.; Andrade, C; Garcés, P.

doi:10.5006/1.3613642

Cited by 6 publications

(5 citation statements)

References 19 publications

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“…A series of solutions simulating the pore solution evolution during the corrosion initiation period were prepared [ 17 , 18 , 19 ]. Table 2 shows the solutions studied and their initial pH and conductivity values.…”

Section: Methodsmentioning

confidence: 99%

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Composition of Corroded Reinforcing Steel Surface in Solutions Simulating the Electrolytic Environments in the Micropores of Concrete in the Propagation Period

et al. 2022

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In the present work, the composition of a corroded reinforcing steel surface is studied at different pH values (related to different degrees of development in the corroding zones of the corrosion process) in solutions simulating chloride-contaminated environments. The media considered consist of saturated calcium hydroxide solutions, progressively neutralized with FeCl2 or by adding 0.5 M NaCl to the solution. The results found in present work confirm higher levels of acidity in the solutions with higher concentrations of Fe2+.In the present work, emphasis is given to the composition of the oxides in solutions that simulate the conditions that exist inside of a localized corrosion pit as a consequence of the reaction of chloride on reinforcing steel. The oxides were studied using Raman and XPS techniques; the results obtained with both techniques are mutually coherent. Thus, in the passive state, the oxides found are those reported previously by other authors, while in the corroding state, the present results are more comprehensive because the conditions tested studied a variety of pore solution composition with several pH values; we tried to reproduce these values inside the pits in conditions of heavy corrosion (very acidic). The oxides found are those typically produced during iron dissolution and seem not the best route to study the corrosion process of steel in concrete; the electrochemical tests better characterize the corrosion stage.

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Section: Methodsmentioning

confidence: 99%

“…The corrosion cell was similar to that used in previous studies [ 17 , 18 , 19 ]. Three identical reinforcing bars and a carbon auxiliary electrode were immersed in each cell (3 steel electrodes in the same cell were tested at the same time).…”

Section: Methodsmentioning

confidence: 99%

Composition of Corroded Reinforcing Steel Surface in Solutions Simulating the Electrolytic Environments in the Micropores of Concrete in the Propagation Period

et al. 2022

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“…An alternative hypothesis regarding the inhibiting mechanism of nitrate was suggested by Saura et al in 2011 [33]; in particular, the behaviour and the efficiency of sodium nitrate (𝑁𝑎𝑁𝑂 3 ) was analysed. In contrast to Justnes hypothesis, the authors considered a different ferrous oxide compound reaction.…”

Section: Nitrate-based Inhibitorsmentioning

confidence: 99%

“…The above mechanism was assessed in simulating concrete pore solution and the  -𝐹𝑒 2 𝑂 3 formed layer was proved to be stable in alkaline environments, inducing a strong protective effect on the steel surface. Nevertheless, problems in the passive film stability were observed in neutral or low-pH solutions; as consequence, it was assumed that nitrate protective effect could be limited in carbonation-induced corrosion [33].…”

Section: Nitrate-based Inhibitorsmentioning

confidence: 99%

Recent advances in the use of inhibitors to prevent chloride-induced corrosion in reinforced concrete

Bolzoni

Brenna

Ormellese

2022

Cement and Concrete Research

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“…However, under aggressive conditions (generally related to carbonation or the presence of chlorides) [1][2][3][4][5][6][7][8], even concrete that has been prepared and applied correctly can lose its protective properties and allow reinforcements to corrode before the minimum of 50 years of its expected useful life have elapsed, sometimes with serious consequences. Therefore, this concept of almost eternal durability is no longer applicable, and indeed the need for continuous maintenance of concrete structures is now recognized, including action and repair on structures with an age of less than 10 years.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

The Useful Life of Reinforced Concrete Structures with Reinforcement Corrosion Due to Carbonation in Non-Aggressive and Normal Exposures in the Spanish Mediterranean

2022

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Some reinforced concrete structures must be repaired at an early stage in their life due to the oxidation processes suffered by their reinforcements; such processes involve serious pathologies that affect the stability and safety of buildings. Spanish legislation distinguishes several classes of environments, with non-aggressive and normal exposure providing a longer useful life of the structure. The present study shows that some structural elements in reinforced concrete, mainly the pillars in the area of contact with the ground, are exposed to significant corrosion by carbonation. This position of the structural elements dramatically and abruptly shortens the useful life of the models provided for the current regulations. A total of 17 pillars in 10 buildings of different ages and locations in the Spanish Mediterranean area, not subject to the presence of chlorides, have been analyzed. These buildings are situated in environments considered by the standard as normal and non-aggressive. The actual carbonation that these elements present have been compared with that which can be derived from the model established by Spanish regulations. Of these pillars, 14 present a carbonation higher than that derived from the model, and the last three pillars largely conform to the figures of the model. This significant deviation shows the need for a revision of the Spanish EHE 08 regulation, which should include aspects such as the action of dampness by capillarity and the differences in electrochemical potential between the different materials.

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Steel Corrosion-Inhibiting Effect of Sodium Nitrate in Simulated Concrete Pore Solutions

Cited by 6 publications

References 19 publications

Composition of Corroded Reinforcing Steel Surface in Solutions Simulating the Electrolytic Environments in the Micropores of Concrete in the Propagation Period

Composition of Corroded Reinforcing Steel Surface in Solutions Simulating the Electrolytic Environments in the Micropores of Concrete in the Propagation Period

Recent advances in the use of inhibitors to prevent chloride-induced corrosion in reinforced concrete

The Useful Life of Reinforced Concrete Structures with Reinforcement Corrosion Due to Carbonation in Non-Aggressive and Normal Exposures in the Spanish Mediterranean

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