Journal ArticleDOI
Nondestructive Testing of Steel-Fiber-Reinforced Concrete Using a Magnetic Approach
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TLDR
A new method for the estimation of the fiber density and their average orientation is presented, based on the employment of a probe that is sensitive to the magnetic properties of the steel fibers.Abstract:
Steel-fiber-reinforced concrete is a composite material which is becoming more and more widely employed in building construction, due to its better resistance to cracking and to crack propagation with respect to plain concrete. Its mechanical behavior strongly depends on the choice of fiber properties and their volume fraction in the concrete mixture. As any material used in building construction, the “on-site” test of its properties represents a very important task. Often, this requires the employment of noninvasive and nondestructive measurement procedures that have to be carried out directly in situ. In this paper, a new method for the estimation of the fiber density and their average orientation is presented. The measurement technique is based on the employment of a probe that is sensitive to the magnetic properties of the steel fibers. The performance of the method has been theoretically and experimentally analyzed.read more
Citations
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Journal ArticleDOI
Relation between fibre distribution and post-cracking behaviour in steel fibre reinforced self-compacting concrete panels
TL;DR: In this paper, the influence of the fiber distribution and orientation on the post-cracking performance of steel fiber reinforced self-compacting concrete (SFRSCC) panels was studied.
Journal ArticleDOI
A magnetic method for non destructive monitoring of fiber dispersion and orientation in steel fiber reinforced cementitious composites—part 1: method calibration
TL;DR: In this paper, a new method for the detection of fiber density and orientation is presented, which is based on the employment of a probe sensitive to the magnetic properties of the steel fibers.
Journal ArticleDOI
Tensile behaviour of high performance fibre-reinforced cementitious composites at high strain rates
TL;DR: In this paper, an experimental research aimed at contributing to the understanding of the behaviour of advanced fibre-reinforced cementitious composites subjected to low and high strain rates was carried out.
Journal ArticleDOI
On the prediction of the orientation factor and fibre distribution of steel and macro-synthetic fibres for fibre-reinforced concrete
TL;DR: In this article, a probabilistic model considering the previous research with stereographical assumptions has been performed allowing the use of fibres that can bend, and the model coincides with the most accepted values and represents with accuracy the existence of boundaries.
Journal ArticleDOI
Influence of flowability, casting time and formwork geometry on fiber orientation and mechanical properties of UHPFRC
Bo Zhou,Yuichi Uchida +1 more
TL;DR: In this article, the influence of flowability and casting time on fiber orientation and mechanical properties of UHPFRCs was evaluated using visualization model concrete and via analysis involving 3D visualization based on X-ray computed tomography.
References
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Journal ArticleDOI
Relationships between fibre distribution, workability and the mechanical properties of SFRC applied to precast roof elements
Liberato Ferrara,Alberto Meda +1 more
TL;DR: In this paper, a series of 40 precast prestressed roof elements was cast, employing a self-compacting steel fiber reinforced concrete (SCSFRC), and they are being used in an industrial building.
Journal ArticleDOI
Characterisation of fibres distribution in a steel fibre reinforced concrete with electrical resistivity measurements
TL;DR: In this paper, the representativity of electrical resistivity values is assessed by analysis of measurements on eight slabs and the complete analysis process is detailed on two slabs which have been casted according to two different fibres distributions.
Journal ArticleDOI
Correlation among Fresh State Behavior, Fiber Dispersion, and Toughness Properties of SFRCs
Liberato Ferrara,Liberato Ferrara,Liberato Ferrara,Yon Dong Park,Yon Dong Park,Yon Dong Park,Surendra P. Shah,Surendra P. Shah,Surendra P. Shah +8 more
TL;DR: In this article, the connection between fiber dispersion and the performance of steel fiber-reinforced concrete composite in the fresh and hardened state was investigated by means of alternating current impedance spectroscopy (AC-IS), and the results, highlighting this correlation, point out their importance for a design of the material composition "tailored to the anticipated mechanical performance and to the specific structural application".
Journal ArticleDOI
Non-destructive monitoring of fiber orientation using AC-IS: An industrial-scale application
TL;DR: In this paper, a comprehensive study has been undertaken to investigate the ability of AC-impedance spectroscopy (AC-IS) to non-destructively monitor the fiber dispersion of conductive fiber-reinforced cement-based materials.
Journal ArticleDOI
Analysis of the impedance spectra of short conductive fiber-reinforced composites
TL;DR: In this paper, the role of fiber pullout, debonding, and orientation on the impedance response of fiber-reinforced composites is investigated in a combination of physical simulations (single wires in tap water) and pixel-based computer modeling.