Study of the effectiveness of realkalisation treatment on reinforcement repassivation by using simulated concrete pore solution

Carvalho, Mariane; Meira, Gibson Rocha; Ferreira, Pablo Ramon Rodrigues; Medeiros, Marcelo Henrique Farias de

doi:10.1016/j.conbuildmat.2022.126318

Cited by 6 publications

(1 citation statement)

References 26 publications

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“…The first one consists in applying an electric field between the structure's reinforcement and an external anode in the presence of an alkaline solution, which enables the high concrete alkalinity to be recovered in the reinforcement concrete cover region. The second one is based on ions transport from an external alkaline source into concrete or a replacement of the carbonated material by a fresh one (Reus andMedeiros 2020, Carvalho et al 2022) Regarding reinforcement repassivation, some authors consider that repassivation condition of reinforcement, after realkalisation treatment, is only reached when its previous corrosion degree is low (Bastidas et al 2008, Carvalho et al 2022. However, other authors consider that repassivation condition would be reached independently of the previous corrosion degree (Andrade et al 1999, Redaelli et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Repassivation of Corroded Bars in Cementitious Materials Subjected to Realkalisation

R. Meira,

R. R. Ferreira,

A. Meira

2023

16th International Conference on Durability of Building Materials and Components

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The effect of concrete realkalinisation on reinforcement repassivation was evaluated by means of electrochemical measurements considering different previous corrosion degrees of reinforcements and different environmental conditions. Reinforcements obtained from a real concrete structure which were activated due to concrete carbonation were used for this purpose. Five different corrosion degrees were considered. All these reinforcements after being classified, were embedded in fresh mortar specimens and were cured in wet chamber for 7 days. After that, they were sequentially subjected to two different environmental conditions; laboratory environment (65% of relative humidity) and 80 % of relative humidity environment. Along all the testing period, reinforcements were monitored on corrosion potential and instantaneous corrosion current density by linear polarisation measurements. Results show that as the previous corrosion degree increases it becomes harder to reach the repassivation condition for reinforcements. This shows that the effectiveness of concrete realkalisation on reinforcement repassivation depends on the previous corrosion degree of reinforcements. The influence of the relative humidity was not significant under the experimental conditions adopted in this work.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Repassivation of Corroded Bars in Cementitious Materials Subjected to Realkalisation

R. Meira,

R. R. Ferreira,

A. Meira

2023

16th International Conference on Durability of Building Materials and Components

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Corrosion inhibition and adsorption behavior of (3-aminopropyl)-triethoxysilane on steel surface in the simulated concrete pore solution contaminated with chloride

Shen

Zhang

2022

Journal of Molecular Liquids

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Repassivation characteristics of carbon steel in chloride-free pore solution after thermal cycles of simulated tropical marine environments

Wu,

Feng,

et al. 2024

Corrosion Reviews

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Repassivation characteristics of carbon steel experienced thermal cycles in tropical marine environments were investigated in a simulated concrete pore solution (SCPS). The results suggested that the damage of passive films on the carbon steel mainly occurred during the cooling process in thermal cycles. The damaged passive films gradually recovered in the SCPS, and the duration of repassivation extended with the amplitude of thermal cycles and cyclic number in the high-amplitude thermal cycles (20–60 °C and 20–70 °C), while it was not significantly affected by the cyclic number in the low-amplitude thermal cycles (20–40 °C and 20–50 °C).

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Study of the effectiveness of realkalisation treatment on reinforcement repassivation by using simulated concrete pore solution

Cited by 6 publications

References 26 publications

Analysis of the Repassivation of Corroded Bars in Cementitious Materials Subjected to Realkalisation

Analysis of the Repassivation of Corroded Bars in Cementitious Materials Subjected to Realkalisation

Corrosion inhibition and adsorption behavior of (3-aminopropyl)-triethoxysilane on steel surface in the simulated concrete pore solution contaminated with chloride

Repassivation characteristics of carbon steel in chloride-free pore solution after thermal cycles of simulated tropical marine environments

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