Corrosion behavior of Cr modified HRB400 steel rebar in simulated concrete pore solution

Liu, Ming; Cheng, Xuequn; Li, Yong; Zhu, Jie; Liu, Haixia

doi:10.1016/j.conbuildmat.2015.05.073

Cited by 109 publications

(20 citation statements)

References 34 publications

(31 reference statements)

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“…However, it suffers from some errors due to the heterogeneity in the actual concrete, unlike the simulated one. The common SCPS contains saturated Ca(OH) 2 6 – 9 or cement extract solution 10 – 13 . It is well known that steel forms a passive layer in SCPS, with a pH ranging from 9.5 to 12.…”

Section: Introductionmentioning

confidence: 99%

An efficient green ionic liquid for the corrosion inhibition of reinforcement steel in neutral and alkaline highly saline simulated concrete pore solutions

Sliem

Radwan

Mohamed

et al. 2020

Sci Rep

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The effect of the green ionic liquid compound, Quaternium-32 (Q-32), on the corrosion inhibition performance of reinforcement steel, in a simulated concrete pore solution, was investigated at different temperatures and pH values, using electrochemical impedance spectroscopy (EIS). The inhibition efficiency was improved as the concentration of Q-32 and pH values were increased. However, it decreased as the temperature was raised. A Q-32 concentration of 20 µmol L-1 exhibited a 94% inhibition efficiency at 20 °C. The adsorption isotherm was evaluated using EIS measurements, and it was found to obey the Langmuir isotherm. The surface topography was examined using an atomic force microscope and scanning electron microscope. The effect of the Q-32 concentration with the highest corrosion efficiency on the mechanical properties of the mortars was also explained by flexure and compression techniques. Reinforced concrete is utilized in most structures, such as buildings and bridges, because of its excellent service and easy maintenance. Reinforcement steel in concrete structures, especially those exposed to marine and industrial environments, can suffer from corrosion due to many factors, such as pH reduction, carbonation, and chloride attack 1-3. The chloride content is considered to be one of the main reasons for decreases in the strength of concrete structures. Once the chloride concentration around the steel bar reaches a threshold value, an early structural deterioration takes place 4,5. The simulated concrete pore solution (SCPS) method is commonly utilized in accelerated tests to investigate the corrosion behavior of the steel in concrete. However, it suffers from some errors due to the heterogeneity in the actual concrete, unlike the simulated one. The common SCPS contains saturated Ca(OH) 2 6-9 or cement extract solution 10-13. It is well known that steel forms a passive layer in SCPS, with a pH ranging from 9.5 to 12. This passive layer becomes unstable and cannot protect it from corrosion when the pH drops below 9.5 14,15. Several preventive techniques have been proposed and tested to stop or mitigate the corrosion of reinforcement steel. For example, galvanization, epoxy coating, cathodic protection and concrete sealing, in addition to the superplasticizer addition and use of corrosion inhibitors, are among the practices to control the corrosion of reinforcement steel 16-18. The corrosion inhibitor efficiency in SCPS has been studied by many researchers 19-26. Most of these studies focus on the adequate dosage of the corrosion inhibitors to provide sufficient inhibition protection for reinforcement steel. However, most of them do not investigate the mechanical properties of the concrete in the presence of the corrosion inhibitor. Corrosion inhibitors in concrete are divided into organic materials, such as alkanolamine and its salts 27,28 , organic acid salt mixtures 29 and inorganic substances, mainly nitrites. However, nitrites are currently banned in many countries due to their carcinogenicity and biologica...

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Section: Introductionmentioning

confidence: 99%

An efficient green ionic liquid for the corrosion inhibition of reinforcement steel in neutral and alkaline highly saline simulated concrete pore solutions

Sliem

Radwan

Mohamed

et al. 2020

Sci Rep

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show abstract

“…To quantify EIS results, the equivalent electrical circuit method has been widely used to analyze electrochemical behavior . In previous studies, equivalent circuit models with one time and two‐time constants were chosen to explain the impedance data for stainless steel in alkaline solutions. In this study, to directly compare the stability of the passive film during deterioration of the concrete, the equivalent electrical circuit with one time constant (Figure ) was used to fit all the experimental data.…”

Section: Resultsmentioning

confidence: 99%

Feasibility of utilizing 2304 duplex stainless steel rebar in seawater concrete: Passivation and corrosion behavior of steel rebar in simulated concrete environments

Shang

Meng

et al. 2019

Materials & Corrosion

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The feasibility of using 2304 duplex stainless steel rebar in seawater concrete was determined by studying the passivation and corrosion behavior of steel in solutions simulated curing and service stage of concrete, respectively. The results demonstrate that 2304 duplex stainless steel rebar could be used with seawater concrete because of a stable passive film formed on the steel surface during the curing stage of concrete even in the presence of 2 M chloride ions. However, due to the synergistic effect of concrete carbonation, the rebar suffered a corrosive attack by chloride due to the lack of OH− inhibition.

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“…Thus, improving the corrosion resistance of rebar holds the key to extending the service life of RCS [7][8][9][10]. It is generally believed that the passive film of the rebar is formed on its surface, while the corrosion of the rebar also initiates from the surface and gradually extends into the matrix [11][12][13][14]. Thus, the surface state of the rebar significantly affects its passivation and anticorrosion performance, especially under the contamination of Cl − [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity

Song

Yang

Guo

et al. 2019

Metals

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Naturally exposed rusted rebar has been widely used for the production of reinforced concrete. However, rusted rebar is prone to corrosion under chloride ion (Cl−) contamination and/or at a low alkalinity of concrete. This study employed two surface modification methods, sand blasting and wire brushing, to augment the corrosion resistance of naturally exposed rusted rebar. Electrochemical tests revealed that the surface-modified rebar displayed a significant improvement of passivation in the concrete alkaline environment and anticorrosion performance in both the Cl− free and Cl−-containing simulated concrete pore solutions of different alkalinity. The enhanced performance was mainly due to the elimination of the rust layer and the direct exposure of the fresh metallic surface to the alkaline medium. Moreover, the effect of surface nanograins on the intensified passive film led to the best passivation performance of the wire-brushed rebar. The overall findings demonstrate that the two developed methods were conducive to the passivation and anticorrosion performance of the rusted rebar and thereby hold great promise for improving the service life of the reinforced concrete structures.

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Corrosion behavior of Cr modified HRB400 steel rebar in simulated concrete pore solution

Cited by 109 publications

References 34 publications

An efficient green ionic liquid for the corrosion inhibition of reinforcement steel in neutral and alkaline highly saline simulated concrete pore solutions

An efficient green ionic liquid for the corrosion inhibition of reinforcement steel in neutral and alkaline highly saline simulated concrete pore solutions

Feasibility of utilizing 2304 duplex stainless steel rebar in seawater concrete: Passivation and corrosion behavior of steel rebar in simulated concrete environments

Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity

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