Application of impulse-thermography for non-destructive assessment of concrete structures

Maierhofer, Ch.; Arndt, Ralf; Röllig, Mathias; Rieck, Carsten; Walther, Andrei; Scheel, Horst; Hillemeier, Bernd

doi:10.1016/j.cemconcomp.2006.02.011

Cited by 124 publications

(71 citation statements)

References 8 publications

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“…Yehia et al (2007) encontrou vazios e defeitos a uma profundidade de 4 cm em um concreto de resistência à compressão de 28 MPa, enquanto Kee et al (2012) encontraram destacamentos a 5 cm em um concreto da mesma resistência. Maierhofer et al (2006) encontraram vazios a uma profundidade de 6 cm em um concreto de 48 MPa, utilizando termografia infravermelha ativa. Alfredo-Cruz (2015), em um concreto de 38 MPa e uma relação a/c de 0.35, detectaram destacamentos até uma profundidade de 5 cm, sendo os defeitos a 7.5 cm os menos visíveis.…”

Section: Qualidade Do Concretounclassified

A termografia infravermelha como um ensaio não destrutivo para a inspeção de pontes de concreto armado: Revisão do estado da arte

Rocha

Póvoas

2017

Revista de la Asociación Latinoamericana de Control de Calidad,

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RESUMOEste artigo tem como objetivo apresentar as metodologias, vantagens e limitações do ensaio da termografia infravermelha para a inspeção de pontes de concreto armado. Foi realizada uma revisão sistemática de artigos e de material acadêmico relativo à área. Esta revisão foca-se principalmente na aplicação passiva e em estudos tanto de laboratório quanto de campo. Utilizou-se uma abordagem crítica da informação disponível quanto a seu alcance. A termografia infravermelha apresenta-se como uma alternativa real para a detecção de defeitos nestas estruturas, sendo mais eficaz quanto mais superficiais sejam estas anomalias. Dependendo do trabalho a ser realizado é necessário levar em conta algumas considerações para obter melhores resultados. E é eficaz em combinação com outros ensaios. Palavras chaves: termografia infravermelha; inspeção de pontes; patologias do concreto. _______________________________________________________________

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Section: Qualidade Do Concretounclassified

A termografia infravermelha como um ensaio não destrutivo para a inspeção de pontes de concreto armado: Revisão do estado da arte

Rocha

Póvoas

2017

Revista de la Asociación Latinoamericana de Control de Calidad,

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“…Using active IRT, in order to enhance thermal contrast, surface is heated up using an external heat source. Maierhofer et al 3 used impulse thermography to detect the hollowness under the tiles. Similarly, long-pulse exposure IRT (LPT) in detecting surface flaws including cracks is preferred.…”

Section: Review On Approaches For Hollowness Assessmentmentioning

confidence: 99%

“…In the near surface region between 0 and 10 cm, active infrared thermography (IRT) is preferred. 3 IRT is reliable for detection of construction surface quality, since it is very sensitive to surface variations. Using IRT, unlike intact surfaces, a portion of surface having a defect has discontinuities in temperature distribution.…”

Section: Review On Approaches For Hollowness Assessmentmentioning

confidence: 99%

Transfer learning on convolutional activation feature as applied to a building quality assessment robot

Liu

Yan

Maruvanchery

et al. 2017

International Journal of Advanced Robotic Systems

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We propose an automated postconstruction quality assessment robot system for crack, hollowness, and finishing defects in light of a need to speed up the inspection work, a more reliable inspection report, as well as an objective through fully automated inspection. Such an autonomous inspection system has a potential to cut labour cost significantly and achieve better accuracy. In the proposed system, a transfer learning network is employed for visual defect detection; a region proposal network is used for object region proposal, a deep learning network employed as feature extractor, and a linear classifier with supervised learning as object classifier; moreover, active learning of top-N ranking region of interest is undertaken for fine-tuning of the transfer learning on convolutional activation feature network. Extensive experiments are validated in a construction quality assessment system room and constructed test bed. The results are promising in a way that the novel proposed automated assessment method gives satisfactory results for crack, hollowness, and finishing defects assessment. To the best of our knowledge, this study is the first attempt to having an autonomous visual inspection system for postconstruction quality assessment of building sector. We believe the proposed system is going to help to pave the way towards fully autonomous postconstruction quality assessment systems in the future.

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“…This reduced heat conduction is followed by a spatially and temporally limited temperature rise at the surface, which can be observed by suited instruments like thermography cameras. Techniques for thermal excitation and evaluation are described in [1,2,3,4].…”

Section: Problemmentioning

confidence: 99%

Influence of air-gaps on the thermal behaviour of the plaster-concrete bond

Krankenhagen¹,

Kervalishvili²,

Maierhofer³

2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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The delamination of a plaster layer, which covers a concrete structure, can be detected by active thermography. In this paper, a systematic series of measurements is described, where the gap between plaster and concrete was varied. These investigations were compared to FEM-simulations. The experimental and simulated data were in good agreement. It was found that the used experimental setup yields only marginal differences between fixed and lose plaster in the thermal behavior. However, significant characteristics within the temperature decays could be resolved, which are clearly related to the air gap.

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Application of impulse-thermography for non-destructive assessment of concrete structures

Cited by 124 publications

References 8 publications

A termografia infravermelha como um ensaio não destrutivo para a inspeção de pontes de concreto armado: Revisão do estado da arte

A termografia infravermelha como um ensaio não destrutivo para a inspeção de pontes de concreto armado: Revisão do estado da arte

Transfer learning on convolutional activation feature as applied to a building quality assessment robot

Influence of air-gaps on the thermal behaviour of the plaster-concrete bond

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