Two-Dimensional Magnetic Orientation of Steel Fibers in Large Slab Elements Made of HPFRC Using an Industrial Robot

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00387088" target="_blank" >RIV/68407700:21110/25:00387088 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21230/25:00387088

Result on the web

<a href="https://doi.org/10.3390/ma19010125" target="_blank" >https://doi.org/10.3390/ma19010125</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ma19010125" target="_blank" >10.3390/ma19010125</a>

Result language

angličtina

Original language name

Two-Dimensional Magnetic Orientation of Steel Fibers in Large Slab Elements Made of HPFRC Using an Industrial Robot

Original language description

Steel fiber-reinforced concrete (SFRC) can exhibit markedly improved mechanical performance when the fibers are preferentially aligned along the principal tensile stress directions. One method of aligning steel fibers is using magnetic methods. However, most existing magnetic alignment techniques rely on solenoids and are restricted to one-dimensional alignment and relatively small specimen sizes. This paper presents a novel planar magnetic orientation device capable of producing arbitrary two-dimensional fiber layouts and demonstrates its applicability from laboratory-scale proof-of-concept tests to large high-performance fiber-reinforced concrete (HPFRC) structural elements. The concept is first verified on transparent ultrasound gel specimens, where image analysis confirms fiber orientation in the prescribed angles. The method is then applied to small prismatic HPFRC specimens (40 mm x 40 mm x 160 mm) with fiber contents of 0.5%, 1.0%, and 1.5%, exposed to different magnetic field intensities (80 mT–140 mT). Flexural tests show increases in average flexural strength compared to non-oriented reference specimens, with 100 mT providing the most efficient alignment for the investigated mixture. A non-destructive electromagnetic method based on the measurement of the quality factor Q of a coil correlates well with flexural strength. Finally, the device is integrated with an industrial robot and used to orient fibers in large HPFRC slabs (1000 mm x 410 mm), achieving an average increase in flexural tensile strength of about 64% relative to non-oriented slabs. The results demonstrate that planar magnetic orientation is a promising approach for tailoring fiber layouts in SFRC structural elements and for enabling automated, programmable manufacturing.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20101 - Civil engineering

Project

<a href="/en/project/GA23-06352S" target="_blank" >GA23-06352S: Directed electromagnetic orientation of dispersed fibre reinforcement for optimal stress resistance in concrete structural members</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials

ISSN

1996-1944

e-ISSN

1996-1944

Volume of the periodical

19

Issue of the periodical within the volume

1

Country of publishing house

CH - SWITZERLAND

Number of pages

16

Pages from-to

1-16

UT code for WoS article

001657531000001

EID of the result in the Scopus database

2-s2.0-105029519029