<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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 <italic>Z</italic> 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 <italic>f</italic>=3 kHz and 400 kHz.</p></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.

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

Department of Building and Testing, Faculty of Civil Engineering

Department of Theoretical and Experimental Electrical Engineering, FEEC

Measurement Science Review

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Steel-fiber reinforced concrete is a composite material characterized by outstanding tensile properties and resistance to the development of cracks. The...

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

Published Online: Mar 07, 2018

Page range: 35 - 40

Received: Nov 15, 2017

Accepted: Feb 20, 2018

DOI: https://doi.org/10.1515/msr-2018-0006

Keywords
Steel-fiber, concrete, non-destructive testing, electromagnetic field, electric impedance

© 2018 Tereza Komarkova et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

Published Online: Mar 07, 2018

Page range: 35 - 40

Received: Nov 15, 2017

Accepted: Feb 20, 2018

DOI: https://doi.org/10.1515/msr-2018-0006

KeywordsSteel-fiber, concrete, non-destructive testing, electromagnetic field, electric impedance

© 2018 Tereza Komarkova et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Steel-fiber, concrete, non-destructive testing, electromagnetic field, electric impedance