Electromagnetic characterization of grouting materials of bridge post tensioned ducts for NDT using capacitive probe |
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Affiliation: | 1. Moscow Technical University of Communications and Informatics, Aviamotornaya, 8a, Moscow 111024, Russian Federation;2. Kotel''nikov Institute of Radio Engineering and Electronics, Fryazino Branch, Russian Academy of Sciences, pl. Vvedenskogo 1, Fryazino, Moscow Oblast, 141190 Russian Federation;3. Central Research Institute of Communication, 8 1st Perova Polya Drive, Moscow 111141, Russian Federation;1. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic;2. Joint Laboratory of Solid State Chemistry, University of Pardubice, Studentska 95, 532 10 Pardubice, Czech Republic;3. Department of Chemistry, Chung Yuan Christian University, 200 Chung Pei Road, Chung-Li, 320, Taiwan |
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Abstract: | The use of a capacitive probe as a non-destructive investigative technique for controlling the post tensioned ducts of bridges has gained increasing acceptance in France since several years. A field campaign measurement made in 2006 has shown the performance of the capacitive probe developed by the IFSTTAR. Nevertheless, some results are not understood, and in particular the behaviour of the probe when cement exudation product are present in the duct. Without an accurate knowledge of the electromagnetic properties of those products it is impossible to quantitatively assess the results of our capacitive probe. This paper reports the development of a coaxial transmission line feature. It was designed to allow the evaluation of a large type of material (liquid, paste or granular) over a large frequency range (50 MHz–4 GHz at maximum). A calibration scheme developed before at the Fresnel Institute was used. Using a two port S parameter instrument, the complex permittivity and magnetic permeability were evaluated by frequency domain measurement. The electromagnetic characterization of cement paste, cement exudation products and injection wax has brought us some key results in the interpretation of the capacitive probe signal. The results of this characterization were then used in a 3D semi analytical modelling of the problem. The studies of configurations with exudation products are presented and compared to experimental results obtained with our capacitive probe on laboratory duct. |
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Keywords: | Civil engineering structures Bridges post tensioned ducts Capacitive probe DPSM modelling Cement exudation products Coaxial transmission line Electromagnetic properties |
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