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A platform for research: civil engineering, architecture and urbanism
NDE of concrete structures using microwaves
This paper presents a novel microwave imaging technology for nondestructive evaluation of concrete structures, focusing on such invisible damage as voids, cracks, and delaminations inside concrete caused by aging, deterioration, and destructive loading. This technology is based on reconstruction of dielectric profile of the concrete structure based on the microwaves sent toward and scattered back from the structure. A comprehensive database containing dielectric properties of concrete and other related construction materials (such as fiber reinforced polymer composites) was developed in the study, which serves as a foundation for analyzing the scattered microwave signals for reconstruction of the microwave image. This study proposed a microwave imaging system that consists of a matrix of numerous tiny antennas. The microwaves sent and received by these antennas are both focused by a unique numerical bi-focusing operator. 3D microwave imaging algorithm equipped with the bi- focusing operator was developed in this study. Numerical simulation demonstrated that a sub-surface image can be successfully reconstructed by using the antenna array and the bi-focusing imaging algorithm. For the experimental verification, a prototype planar microwave antenna array was fabricated and tested on a concrete block. Internal and invisible voids in the block were successfully detected. The microwave antenna array is being further developed for condition assessment of concrete structures strengthened with fiber reinforced polymer jackets.
NDE of concrete structures using microwaves
This paper presents a novel microwave imaging technology for nondestructive evaluation of concrete structures, focusing on such invisible damage as voids, cracks, and delaminations inside concrete caused by aging, deterioration, and destructive loading. This technology is based on reconstruction of dielectric profile of the concrete structure based on the microwaves sent toward and scattered back from the structure. A comprehensive database containing dielectric properties of concrete and other related construction materials (such as fiber reinforced polymer composites) was developed in the study, which serves as a foundation for analyzing the scattered microwave signals for reconstruction of the microwave image. This study proposed a microwave imaging system that consists of a matrix of numerous tiny antennas. The microwaves sent and received by these antennas are both focused by a unique numerical bi-focusing operator. 3D microwave imaging algorithm equipped with the bi- focusing operator was developed in this study. Numerical simulation demonstrated that a sub-surface image can be successfully reconstructed by using the antenna array and the bi-focusing imaging algorithm. For the experimental verification, a prototype planar microwave antenna array was fabricated and tested on a concrete block. Internal and invisible voids in the block were successfully detected. The microwave antenna array is being further developed for condition assessment of concrete structures strengthened with fiber reinforced polymer jackets.
NDE of concrete structures using microwaves
ZfP von Betonbauwerken mittels Mikrowellen
Feng, M.Q. (author) / Kim, Y.J. (author)
Structural Materials Technology, 6 ; 373-380
2004
8 Seiten, 9 Bilder, 9 Quellen
Conference paper
Storage medium
English
NDE of Concrete Structures Using Microwaves
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