Monitoring Corrosion of Steel Bars in Reinforced Concrete Structures

Verma, Sanjeev Kumar; Bhadauria, Sarita Singh; Akhtar, Saleem

doi:10.1155/2014/957904

Cited by 61 publications

(34 citation statements)

References 40 publications

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“…The reaction of metal active centers with the corrosion inhibitor molecules occurs via the substitutional replacement process for the electrolyte molecules at the metal/solution interface 74 . The adsorption isotherm models determine the type of reaction, whether it is spontaneously or not, and whether it is physical or chemical interaction from the value of the standard adsorption free energy change (Δ G o ).…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…In aggressive environments, the steel reinforcement in concrete columns is highly vulnerable to corrosion, leading to the development of a rusted shell around the reinforcement and its expansion of about 6 to 10 times its original volume (Verma, et al, 2014). This process initiates hairline cracks in the concrete that progress into wide cracks, which significantly reduces the ultimate axial capacity and leads to the brittle failure behavior of concrete columns owing to the damage to the lateral reinforcement (Pantelides, et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns

et al. 2020

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Hollow concrete columns (HCCs) are one of the preferred construction systems for bridge piers, piles, and poles because they require less material and have a high strength-to-weight ratio. While spiral spacing and concrete compressive strength are two critical design parameters that control HCC behavior, the deterioration of steel reinforcement is becoming an issue for HCCs. This study explored the use of glassfiber-reinforced-polymer (GFRP) bars as longitudinal and lateral reinforcement in hollow concrete columns and investigated the effect of various spiral spacing and different concrete compressive strengths (fc'). Seven hollow concrete columns with inner and outer diameters of 90 mm and 250 mm, respectively, and reinforced with six longitudinal GFRP bars were prepared and tested. The spiral spacing was no spirals, 50 mm, 100 mm, and 150 mm; the fc' varied from 21 to 44 MPa. Test results show that reducing the spiral spacing resulted in increased HCC uniaxial compression capacity, ductility, and confined strength due to the high lateral confining efficiency. Increasing fc', on the other hand, increased the axial-load capacity but reduced the ductility and confinement efficiency due to the brittle behavior of high compressive-strength concrete. The analytical models considering the axial-load contribution of the GFRP bars and the confined concrete core accurately predicted the post-loading behavior of the HCCs.

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“…Furthermore, OCP measurements cannot provide reliable results with epoxy-coated reinforcement or with coated concrete surfaces and are highly influenced by moist or wetting condition of concrete and by the composition of the concrete. The analysis criteria should be carefully performed since may change for different aggressive environments [222].…”

Section: Limitations Of Electrochemical Sensors For Corrosion Monitormentioning

confidence: 99%

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Figueira¹

2017

Applied Sciences

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Several methods for corrosion monitoring of reinforced concrete structures (RCS) have been proposed in the last few decades. These systems may be used either in new, existing or repaired structures. The corrosion monitoring can be performed by different methodologies. These may or may not be destructive, use different degrees of complexity and cost, and provide information on the progression and kinetics of the corrosion phenomena. The destructive methods are limited to sampling. Therefore, these may not be representative of the whole structure, which is extremely important in RCS with large heterogeneities both in terms of materials used and in terms of the exposure environment. Within this context, non-destructive methods have been widely developed, which are intended to provide quick information about the entire structure. Ideally, these systems should be able to detect the corrosion state of the steel inside the concrete, the main causes of corrosion and the evolution of corrosion phenomena over time. This manuscript reviews and summarizes the actual state of the art and the main achievements in the field of electrochemical sensors based on non-destructive methods for corrosion monitoring of RCS in the last few years. The challenges and perspectives in this field will also be discussed.

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Monitoring Corrosion of Steel Bars in Reinforced Concrete Structures

Cited by 61 publications

References 40 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

Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

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