Detection and Inspection of Steel Bars in Reinforced Concrete Structures Using Active Infrared Thermography with Microwave Excitation and Eddy Current Sensors

Szymanik, Barbara; Frankowski, Paweł; Chady, Tomasz; Chelliah, Cyril Robinson Azariah John

doi:10.3390/s16020234

Cited by 69 publications

(44 citation statements)

References 23 publications

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“…A measurement is made with a single-frequency or a multi-frequency method. Tests on reinforced concrete structures often employ multi-frequency signals of sinusoidal type A sinusoidal excitation signal emitted inside the structure, depends on time t. Therefore, the excitation W(t)can be expressed [12,13] with a harmonic function:…”

Section: Electromagnetic Methodsmentioning

confidence: 99%

Accuracy of Eddy-Current and Radar Methods Used to Reinforcement Detection

Drobiec¹,

Jasiński²,

Mazur³

2019

Preprint

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Currently, electromagnetic and radar methods are the most common non-destructive tests for non-destructive rebar location in structures.. Both methods have some advantages, disadvantages and limitations. This article is an attempt to describe possibilities of particular methods with emphasizing their advantages and limitations. The first stage of tests included results from tests conducted on a lintel beam made of autoclaved aerated concrete (AAC) and reinforced with small-diameter rebars and rebars placed close to each other. The second stage consisted in testing nine lightweight concrete specimens, each with three bars having a diameter of 10, 16 and 20 mm at three different space arrangements, to determine the effect of bar diameter and spacing on the measurement accuracy. The reinforcement of lintels and specimens was tested with two different electromagnetic scanners and a ground-penetrating radar (GPR) device. Received results from direct tests were compared with results from non-destructive tests (NDT). NDT tests conducted in such an element were found to perform the correct assessment of the concrete cover, and at the same time to give ambiguous results with reference to shape and number of rebars.

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Section: Electromagnetic Methodsmentioning

confidence: 99%

Accuracy of Eddy-Current and Radar Methods Used to Reinforcement Detection

Drobiec¹,

Jasiński²,

Mazur³

2019

Preprint

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“…The non-destructive methods presented to date, such as those discussed in papers [11]- [12], exploit the properties of the electromagnetic (EMG) field to monitor the distribution of fibers in the tested composite. To evaluate the properties of the composite components, the actual principle employs the electric impedance Ẑ in the region of the monitored sample; we can then write…”

Section: The Impedance Measuring Methods and The Near-resonance Statementioning

confidence: 99%

Testing an Impedance Non-destructive Method to Evaluate Steel-Fiber Concrete Samples

Komárková

Fiala²,

Steinbauer

et al. 2018

Measurement Science Review

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Steel-fiber reinforced concrete is a composite material characterized by outstanding tensile properties and resistance to the development of cracks. The concrete, however, exhibits such characteristics only on the condition that the steel fibers in the final, hardened composite have been distributed evenly. The current methods to evaluate the distribution and concentration of a fiber composite are either destructive or exhibit a limited capability of evaluating the concentration and orientation of the fibers. In this context, the paper discusses tests related to the evaluation of the density and orientation of fibers in a composite material. Compared to the approaches used to date, the proposed technique is based on the evaluation of the electrical impedance Z in the band close to the resonance of the sensor-sample configuration. Using analytically expressed equations, we can evaluate the monitored part of the composite and its density at various depths of the tested sample. The method employs test blocks of composites, utilizing the resonance of the measuring device and the measured sample set; the desired state occurs within the interval of between f=3 kHz and 400 kHz.

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“…NOTE -For recommendations on welding steels for reinforcing concrete, see prEN ISO 17660. [3][4][5]. The regulatory application of this standard, which was due to enter into force on 1 February 2007, is therefore suspended; as a result, the prescriptions and / or provisions of this standard in relation to the CE marking cannot be applied.…”

mentioning

confidence: 99%

Weldability - Behavior of Welded Reinforcement

2019

Rev.Chim.

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Weldability involves two aspects: welding behavior of components and safety in operation. The two aspects will be reduced to the mechanical characteristics of the elements and to the chemical composition. In the case of steel reinforcing rebar's, it is reduces to the percentage of Cech(carbon equivalent) and to the mechanical characteristics: the yielding limit, the ultimate limit, and the elongations which after that represent the ductility class in which the re-bars is framed. The paper will present some types of steel reinforcing rebar's with its mechanical characteristics and the welding behavior of those elements. In the current work, process-related behavior of welded reinforcement, joint local and global mechanical properties, and their correlation with behavior of normal reinforcement and also the mechanical performance resulted in this type of joints.

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Detection and Inspection of Steel Bars in Reinforced Concrete Structures Using Active Infrared Thermography with Microwave Excitation and Eddy Current Sensors

Cited by 69 publications

References 23 publications

Accuracy of Eddy-Current and Radar Methods Used to Reinforcement Detection

Accuracy of Eddy-Current and Radar Methods Used to Reinforcement Detection

Testing an Impedance Non-destructive Method to Evaluate Steel-Fiber Concrete Samples

Weldability - Behavior of Welded Reinforcement

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