Corrosion evaluation of carbon steel bars by magnetic non-destructive method

Diogenes, Aldecira G.; Moura, Elineudo Pinho de; Machado, André da Silveira; Gonçalves, L. L.

doi:10.1080/10589759.2021.2021403

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…The same stress level in loading and unloading corresponded to two different ΔVpp. This was due to the hysteresis of the rebar as a ferromagnetic material after loading and unloading [40]. The working stress loss stage corresponded to the unloading stage.…”

Section: The Evolution Law Of Induced Voltage With Working Stressmentioning

confidence: 99%

Working Stress Measurement of Prestressed Rebars Using the Magnetic Resonance Method

et al. 2023

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Prestressed rebars are usually used to apply vertical prestress to concrete to prevent web cracking. The reduction of working stress will affect the durability of the structure. However, the existing working stress detection methods for prestressed rebars still need to be improved. To monitor the working stress of rebars, a magnetic resonance sensor was introduced to carry out experimental research. The correlation between rebar stress and the sensor’s induced voltage was theoretically analyzed using the magnetoelastic effect and magnetic resonance theory. A working stress monitoring method for prestressed rebars based on magnetic resonance was proposed. Working stress monitoring experiments were carried out for 16 mm, 18 mm, and 20 mm diameter rebars. The results showed that the induced voltage peak-to-peak value and the rebar prestress were nonlinearly correlated under different working conditions. Correlations between the characteristic indicators and the rebar working stress were obtained using nonlinear and linear fit. The cubic polynomial segmented fit outperformed the gradient overall linear fit, with the goodness of fit R2 greater than 0.96. The average relative error values of working stress monitoring were less than 5% under different working conditions. This provides a new method for working stress measurement of vertical prestressed rebars.

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Section: The Evolution Law Of Induced Voltage With Working Stressmentioning

confidence: 99%

Working Stress Measurement of Prestressed Rebars Using the Magnetic Resonance Method

et al. 2023

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“…One of the RMTs is the Magnetic Memory Method (MMM). The method can detect abnormal conditions arising from changes in crystalline structures of rebar material resulting from stress concentration, corrosion, or cracks [ 3 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. The magneto-resistance (MR) and Hall effect sensors are most commonly used in the magnetic test.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Reinforced Concrete Structures with Magnetic Method and ACO (Amplitude-Correlation-Offset) Decomposition

Frankowski

Chady

2023

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The magnetic method is one of the very few nondestructive testing (NDT) techniques that provide the possibility to conduct area tests of reinforced concrete (RC) structures in a fast, cheap, and straightforward way. This paper aims to present a new approach to the simultaneous identification of rebars’ diameter, alloy class, and thickness of the concrete cover tested with this method. Since rebars from different manufacturers may have different electromagnetic properties (standardization only for mechanical properties), preparing an effective and universal database is impossible. In this work, ACO decomposition is proposed, a new attributes extraction method designed to identify object parameters, even if it is impossible to collect a suitable training database (by pattern recognition and analysis of the deviation). Conducted tests prove that the ACO method enables accurate reflection of the waveform shape and limitation of attributes number to three or fewer (avoiding the curse of dimensionality). These properties, combined with the ability to analyze spatial components of magnetic induction (which only magnetic sensors provide), make the complex task of identification of three parameters more straightforward and the separation between the results received for different classes larger. This article presents the measurement results and the whole identification process.

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Identification and classification of bearing steel bars based on low-frequency eddy current detection method

et al. 2023

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Corrosion evaluation of carbon steel bars by magnetic non-destructive method

Cited by 5 publications

References 34 publications

Working Stress Measurement of Prestressed Rebars Using the Magnetic Resonance Method

Working Stress Measurement of Prestressed Rebars Using the Magnetic Resonance Method

Evaluation of Reinforced Concrete Structures with Magnetic Method and ACO (Amplitude-Correlation-Offset) Decomposition

Identification and classification of bearing steel bars based on low-frequency eddy current detection method

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