Transmission Approach for Near-Field Non Destructive Characterization of Steel Fiber Reinforcd Concrete at Microwave Frequencies
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Data publicació2009
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Abstract
Steel Fiber-Reinforcement is a way to strengthen concrete structures which results to be more
flexible and less expensive than the conventional hand-tied rebars, while still increasing the tensile
strength. In order to ensure the prescribed tensile strength, the conglomerate needs to have a certain
volumetric density of fibers uniformily distributed over the structure. In this paper, a novel study
on microwave Non-Destructive Testing (NDT) for Steel Fiber Reinforced Concrete (SFRC) is developed,
with the objective to produce an image of the fiber density distribution in the concrete. An
electromagnetic model is formulated relating the electromagnetic properties of SFRC to physical
properties of this conglomerate such as fiber density or humidity content. A measurement system
based on two dielectric waveguide antennas working at the appropiate microwave frequency range is
designed, according to the environmental constraints and subject to the electromagnetic requirements
of the situation. Laboratory non-destructive measurements on real SFRC test structures and images
of the fiber density distribution in the SFRC are shown in this paper. Agreement with the theoretical
simulated results is achieved.
CitacióRoqueta, G.; Romeu, J.; Jofre, L. Transmission Approach for Near-Field Non Destructive Characterization of Steel Fiber Reinforcd Concrete at Microwave Frequencies. A: International Conference on Electromagnetic Near-Field Characterization and Imaging. "4th". 2009.
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