1. bookVolume 18 (2018): Edition 1 (February 2018)
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Magazine
eISSN
1335-8871
Première parution
07 Mar 2008
Périodicité
6 fois par an
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Anglais
access type Accès libre

Testing an Impedance Non-destructive Method to Evaluate Steel-Fiber Concrete Samples

Publié en ligne: 07 Mar 2018
Volume & Edition: Volume 18 (2018) - Edition 1 (February 2018)
Pages: 35 - 40
Reçu: 15 Nov 2017
Accepté: 20 Feb 2018
Détails du magazine
License
Format
Magazine
eISSN
1335-8871
Première parution
07 Mar 2008
Périodicité
6 fois par an
Langues
Anglais
Abstract

Steel-fiber reinforced concrete is a composite material characterized by outstanding tensile properties and resistance to the development of cracks. The concrete, however, exhibits such characteristics only on the condition that the steel fibers in the final, hardened composite have been distributed evenly. The current methods to evaluate the distribution and concentration of a fiber composite are either destructive or exhibit a limited capability of evaluating the concentration and orientation of the fibers. In this context, the paper discusses tests related to the evaluation of the density and orientation of fibers in a composite material. Compared to the approaches used to date, the proposed technique is based on the evaluation of the electrical impedance Z in the band close to the resonance of the sensor–sample configuration. Using analytically expressed equations, we can evaluate the monitored part of the composite and its density at various depths of the tested sample. The method employs test blocks of composites, utilizing the resonance of the measuring device and the measured sample set; the desired state occurs within the interval of between f=3 kHz and 400 kHz.

Keywords

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