Detection of reinforcement bars in concrete slab by infrared thermography and microwaves excitation

Brachelet, Franck; Keo, Sam Ang; Defer, Didier; Breabăn, Florin

doi:10.21611/qirt.2014.177

Cited by 13 publications

(11 citation statements)

References 8 publications

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“…W praktyce budowlanej często występuje potrzeba określenia struktury materiałowej wykonanych elementów budynku, do których można zaliczyć elemen- Aktualnie badania elementów żelbetowych przy użyciu termografii aktywnej nie wyszły poza obszar badań naukowych. W literaturze można spotkać opracowania podobnych zagadnień dla bloków betonowych z dużymi wtrąceniami w postaci prostopadłościennych elementów [6][7][8][9], lokalizacją prętów stalowych w betonie z pobudzeniem mikrofalami [10] lub analizy numeryczne [11].…”

Section: Wprowadzenieunclassified

Termografia Aktywna Jako Nowoczesna Metoda Badań Elementów Żelbetowych

Noszczyk

Nowak

2016

ZNPRzBiS

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Section: Wprowadzenieunclassified

Termografia Aktywna Jako Nowoczesna Metoda Badań Elementów Żelbetowych

Noszczyk

Nowak

2016

ZNPRzBiS

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“…The method can be helpful when the cover thickness is lower than 5 cm. The method is not commonly used in practice [ 3 , 19 , 20 , 21 , 22 , 23 , 24 ]. Methods based on terahertz frequencies (frequencies of the order of 10 11 Hz to 10 13 Hz).…”

Section: Introductionmentioning

confidence: 99%

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

Frankowski

Chady

2023

Materials

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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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“…The image sequence may be analyzed in the time domain or in the frequency domain. Since it is more difficult to detect inclusions in large-sized and massive members, they are less often investigated using this method [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. No experiment in which the time of recording thermograms is considerably extended until a thermal equilibrium between the tested element and the environment is reached.…”

Section: Introductionmentioning

confidence: 99%

Inverse Contrast in Non-Destructive Materials Research by Using Active Thermography

Noszczyk

Nowak

2019

Materials

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Background: it is undesirable for defects to occur in building partitions and units. There is a need to develop and improve research techniques for locating such defects, especially non-destructive techniques for active thermography. The aim of the experiment was to explore the possibility of using active thermography for testing large-sized building units (with high heat capacity) in order to locate material inclusions. Methods: as part of the experiment, two building partition models—one made of gypsum board (GB) and another made of oriented strand board (OSB)—were built. Three material inclusions (styrofoam, granite, and steel), considerably differing in their thermal parameters, were placed in each of the partitions. A 7.2 kW infrared radiator was used for thermally exciting (heating) the investigated element for 30 min. The distribution of the temperature field was studied on both sides of the partition for a few hours. Results: using the proposed investigative method, one can detect defects in building partitions under at least 22 mm of thick cladding. At a later cooling down phase, inverse temperature contrasts were found to occur—the defects, which at the beginning of cooling down were visible as warmer areas, at a later phase of cooling down are perceived as cooler areas, and vice versa (on the same front surface). In the transmission mode, the defects are always visible as areas warmer than defect-free areas. Moreover, a quantitative (defect location depth) analysis with an accuracy of up to 10% was carried out using the Echo Defect Shape method. Conclusions: active thermography can be used in construction for non-destructive materials testing. When the recording of thermograms is conducted for an appropriate length of time, inverse contrasts can be observed (on the same front surface).

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Detection of reinforcement bars in concrete slab by infrared thermography and microwaves excitation

Cited by 13 publications

References 8 publications

Termografia Aktywna Jako Nowoczesna Metoda Badań Elementów Żelbetowych

Termografia Aktywna Jako Nowoczesna Metoda Badań Elementów Żelbetowych

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

Inverse Contrast in Non-Destructive Materials Research by Using Active Thermography

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