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Determination of dielectric properties of insitu concrete at radar frequencies

Davis, J. / Millard, S.G. / Huang, Y. / Bungey, J.H.

Ground penetrating radar (GPR) is becoming increasingly popular as a completely non-destructive method for assessing the integrity of concrete structures. However, one difficulty that test engineers have is in relating radar signal return times to the geometric location of a sub-surface feature. It is necessary to have a prior knowledge of the concrete relative permittivity to know the speed of a radar signal in the concrete. The relative permittivity is very sensitive to the moisture content of the concrete & hence may not be uniform within the concrete depth. This paper reports on the development of a wide-band TEM horn antenna system suitable for field applications. The system operates in the frequency domain over the range 300 MHz-3 GHz. An inverse modelling procedure has been developed to determine the profile of a varying relative permittivity with depth. Initial validation trials were carried out on sheets and sandwiches of dielectric material. Tests were then carried out on laboratory test slabs of both cement mortar and concrete. These slabs were pre-conditioned to give a varying moisture profile with depth. Initial results are presented that show the system has a good potential for field use.

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Determination of dielectric properties of insitu concrete at radar frequencies

Davis, J. / Millard, S.G. / Huang, Y. / Bungey, J.H.

Ground penetrating radar (GPR) is becoming increasingly popular as a completely non-destructive method for assessing the integrity of concrete structures. However, one difficulty that test engineers have is in relating radar signal return times to the geometric location of a sub-surface feature. It is necessary to have a prior knowledge of the concrete relative permittivity to know the speed of a radar signal in the concrete. The relative permittivity is very sensitive to the moisture content of the concrete & hence may not be uniform within the concrete depth. This paper reports on the development of a wide-band TEM horn antenna system suitable for field applications. The system operates in the frequency domain over the range 300 MHz-3 GHz. An inverse modelling procedure has been developed to determine the profile of a varying relative permittivity with depth. Initial validation trials were carried out on sheets and sandwiches of dielectric material. Tests were then carried out on laboratory test slabs of both cement mortar and concrete. These slabs were pre-conditioned to give a varying moisture profile with depth. Initial results are presented that show the system has a good potential for field use.

Determination of dielectric properties of insitu concrete at radar frequencies

Davis, J. / Millard, S.G. / Huang, Y. / Bungey, J.H.

Ground penetrating radar (GPR) is becoming increasingly popular as a completely non-destructive method for assessing the integrity of concrete structures. However, one difficulty that test engineers have is in relating radar signal return times to the geometric location of a sub-surface feature. It is necessary to have a prior knowledge of the concrete relative permittivity to know the speed of a radar signal in the concrete. The relative permittivity is very sensitive to the moisture content of the concrete & hence may not be uniform within the concrete depth. This paper reports on the development of a wide-band TEM horn antenna system suitable for field applications. The system operates in the frequency domain over the range 300 MHz-3 GHz. An inverse modelling procedure has been developed to determine the profile of a varying relative permittivity with depth. Initial validation trials were carried out on sheets and sandwiches of dielectric material. Tests were then carried out on laboratory test slabs of both cement mortar and concrete. These slabs were pre-conditioned to give a varying moisture profile with depth. Initial results are presented that show the system has a good potential for field use.

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Title:

Determination of dielectric properties of insitu concrete at radar frequencies

Additional title:

Bestimmung dielektrischer Eigenschaften von Beton mit Radarfrequenzen im Feldversuch

Contributors:

Davis, J. (author) / Millard, S.G. (author) / Huang, Y. (author) / Bungey, J.H. (author)

Published in:

Internationales Symposium, NDT-CE, Nondestructive Testing in Civil Engineering, 2003 ; 1-9

DGZfP-Berichtsband ; BB 85-CD

Publication date:

2003

Size:

9 Seiten, 6 Bilder, 3 Tabellen, 7 Quellen

Remarks:

(Nicht paginiert)

ISBN:

Type of media:

Conference paper

Type of material:

Storage medium

Language:

English

Keywords:

zerstörungsfreie Prüfung , elektromagnetische Welle , Radar , Beton , dielektrische Eigenschaft , Qualitätskontrolle , relative Dielektrizitätskonstante , Feldversuch

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