Influence of concrete properties on the detection of voids with impulse-thermography

Maierhofer, Ch.; Arndt, Ralf; Röllig, Mathias

doi:10.1016/j.infrared.2006.06.007

Cited by 48 publications

(39 citation statements)

References 8 publications

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“…Maierhofer et al [3] reported about the detection of voids having different sizes beneath the surface of a concrete test specimen. Additional basic research involving the quantitative analysis of experimental and numerical pulsed thermography data has also been performed on concrete specimens with artificially created defects [16][17][18]. Recently, there has been interest in the combining of thermographic results with the results obtained from, for example, ground penetrating radar and ultrasound for the detection of cracks, voids, and delamination [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Determination of the applicability and limits of void and delamination detection in concrete structures using infrared thermography

Cotič

Kolarič

Bosiljkov

et al. 2015

NDT & E International

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Section: Introductionmentioning

confidence: 99%

Determination of the applicability and limits of void and delamination detection in concrete structures using infrared thermography

Cotič

Kolarič

Bosiljkov

et al. 2015

NDT & E International

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“…The heat diffusion field generated by the release of thermal energy from transient sources, such as those detected by the infrared thermography technique, has been studied in the past few decades. This interest has been growing since heat diffusion patterns can be used to detect cracks, voids and other classes of defects in materials and construction elements [1][2][3][4][5]. Several numerical simulation techniques have been proposed to improve our understanding of how heat waves propagate in solid and fluid media.…”

Section: Introductionmentioning

confidence: 99%

Coupling BEM/TBEM and MFS for the simulation of transient conduction heat transfer

Tadeu

Simões

2010

Numerical Meth Engineering

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SUMMARYThe coupling between the boundary element method (BEM)/the traction boundary element method (TBEM) and the method of fundamental solutions (MFS) is proposed for the transient analysis of conduction heat transfer in the presence of inclusions, thereby overcoming the limitations posed by each method. The full domain is divided into sub-domains, which are modeled using the BEM/TBEM and the MFS, and the coupling of the sub-domains is achieved by imposing the required boundary conditions.The accuracy of the proposed algorithms, using different combinations of BEM/TBEM and MFS formulations, is checked by comparing the resulting solutions against referenced solutions.The applicability of the proposed methodology is shown by simulating the thermal behavior of a solid ring incorporating a crack or a thin inclusion in its wall. The crack is assumed to have null thickness and does not allow diffusion of energy; hence, the heat fluxes are null along its boundary. The thin inclusion is modeled as filled with thermal insulating material.

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“…However, the method is not sensitive to void spacing or specific surface. Maihofer et al 6 applied flash thermography to detect shallow voids in concrete structures. After heating the sample, the surface heat variation was measured by an infrared camera during cool down.…”

Section: Introductionmentioning

confidence: 99%

Rayleigh surface waves for characterization of the air void system in fresh concrete

Lissenden

Then

et al. 2010

Health Monitoring of Structural and Biological Systems 2010

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The durability of concrete pavement to freeze/thaw cycles is mainly dependent on the air void system. Air entraining admixtures are used to provide a beneficial air void system. Large entrapped air voids reduce strength and make it insufficient to simply characterize the porosity by the air content; void spacing and specific surface parameters are also important. Ability to perform quality assurance testing -nondestructive evaluation -of concrete pavement soon after placement is highly desirable. Thus, laboratory experiments have been conducted to investigate Rayleigh surface waves for characterization of porosity in fresh concrete. A mediator mounted onto a Plexiglas wedge is used to introduce waves from an ultrasonic transducer onto the surface of the concrete. The challenges are that fresh concrete is highly attenuative and that the material properties evolve as the concrete sets. Rayleigh wave speed is shown to be sensitive to porosity by simple micromechanical modeling, and results are presented for normal concrete with large aggregate, sieved concrete, and mortar. Wave speeds are significantly less (10-22% depending on time after placement) for concrete with approximately 5% porosity relative to concrete with no air entrainment admixture.

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Influence of concrete properties on the detection of voids with impulse-thermography

Cited by 48 publications

References 8 publications

Determination of the applicability and limits of void and delamination detection in concrete structures using infrared thermography

Determination of the applicability and limits of void and delamination detection in concrete structures using infrared thermography

Coupling BEM/TBEM and MFS for the simulation of transient conduction heat transfer

Rayleigh surface waves for characterization of the air void system in fresh concrete

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