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[1] Afroughsabet, V., Biolzi, L. & Ozbakkaloglu, T., High-performance fiber-reinforced concrete: A review. J Mater Sci, 51(14), pp. 6517–51, 2016 July 30. https://doi. org/10.1007/s10853-016-9917-4
[2] Yoo, D.-Y.D.Y. & Banthia, N., Mechanical properties of ultra-high-performance fiber- reinforced concrete: A review. Cem Concr Compos, 73, pp. 267–280, 2016 October. [Crossref]
[3] Nicolaides, D., Kanellopoulos, A., Savva, P. & Petrou, M., Experimental field investi- gation of impact and blast load resistance of Ultra High Performance Fibre Reinforced Cementitious Composites (UHPFRCCs). Constr Build Mater, 95, pp. 566–574, 2015 October. [Crossref]
[4] Nicolaides, D., Kanellopoulos, A., Petrou, M., Savva, P. & Mina, A., Development of a new Ultra High Performance Fibre Reinforced Cementitious Composite (UHPFRCC) for impact and blast protection of structures. Constr Build Mater, 95, pp. 667–674, 2015 October. [Crossref]
[5] Yoo, D.-Y., Kang, S.-T. & Yoon, Y.-S. Effect of fiber length and placement method on flexural behavior, tension-softening curve, and fiber distribution characteristics of UHPFRC. Constr Build Mater, 64, pp. 67–81, 2014 August. https://doi.org/10.1016/ pii/S0950061814003249
[6] Lovichova, R., Fornusek, J., Mara, M., Kocova, M. & Rihova, Z., The fibre orienta- tion influence in cementitious composite against extreme load resistance. IOP Conf Ser Mater Sci Eng, 307(1), p. 012069, 2018 February. 899X/307/1/012069 [Crossref]
[7] Fornůsek, J. & Tvarog, M., Influence of casting direction on fracture energy of fiber- reinforced cement composites. Key Eng Mater, 594–595, pp. 444–448, 2013 December. [Crossref]
[8] Stiel, T., Karihaloo, B.L. & Fehling, E., Effect of casting direction on the mechanical properties of CARDIFRC. In Proceedings of the International Symposium on Ultra High Performance Concrete. pp. 481–493, 2004.
[9] Lovichová, R., Takáčová, K., Künzel, K., Papež, V., Mára, M., Fornůsek, J., et al., Directed orientation of steel fibres in ultra-high-performance cementitious composite using the magnetic field. WIT Trans Built Environ, 196, pp. 39–49, 2020.
[10] Lovichova, R., Fornůsek, J., Soukupová, L. & Valentin, J,. Ultrasound gel as suitable tool for simulation of the fibre orientation in the fibre reinforced concrete. In 54th In- ternational Conference on Experimental Stress Analysis. Czech Society for Mechanics, pp. 1–4, 2016. http://experimentalni-mechanika.cz/cs/konference/konference/2016
[11] Bažantová, Z., Kolář, K., Konvalinka, P. & Litoš, J., Multi-functional high-performance cement based composite. Key Eng Mater, 677, pp. 53–56, 2016 January.
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Open Access
Research article

Applicability of Magnetic Field for Directed Orientation of Steel Fibres in High-Performing Cementitious Composites

kristýna takáčová1,
karel künzel2,
václav papež2,
petr konrád1,
michal mára1,
jindřich fornŭsek1,
přemysl kheml1,
radoslav sovják1
1
Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic
2
Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic
International Journal of Computational Methods and Experimental Measurements
|
Volume 10, Issue 2, 2022
|
Pages 131-145
Received: N/A,
Revised: N/A,
Accepted: N/A,
Available online: N/A
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Abstract:

This paper explores the practical possibility of using a magnetic field to orient steel fibres in a fresh concrete matrix. This process leads to preferential orientation, which increases the desired mechanical properties of the hardened material. In general, this paper focuses on the technical aspects of the orientation process and identifies key areas, such as the strength and shape of the magnetic field, velocity of the sample's passage through the magnetic field and viscosity of the materials. A prototype orienting apparatus was constructed with different permanent magnet systems to evaluate their performance. An ultrasound gel and a cementitious matrix were used as a medium for the fibres. Numerical simulations were created to further understand the effects of the magnetic field's strength and shape. The final orientation of the fibres in hardened concrete was evaluated using Q factor measurements, X-ray scans and bending tests. A sufficiently strong magnetic field can be used to orient fibres in fresh concrete.

Keywords: Cementitious composite, Concrete, Fibre orientation, HPFRC, Magnetic field, Steel fibre

1. Introduction

2. Experimental Program

3. Investigation of the Influence of the Magnetic Field on the Fibre

4. Results and Discussion

5. Summary and Conclusions

Acknowledgments

The authors gratefully acknowledge the financial support from the Czech Science Foundation (grant number GA20-00624S). The authors also acknowledge assistance from students and technical staff at the Experimental Centre of the CTU who participated on the internal CTU projects SGS19/143/OHK1/3T/11 and SGS20/054/OHK1/1T/11.

References
[1] Afroughsabet, V., Biolzi, L. & Ozbakkaloglu, T., High-performance fiber-reinforced concrete: A review. J Mater Sci, 51(14), pp. 6517–51, 2016 July 30. https://doi. org/10.1007/s10853-016-9917-4
[2] Yoo, D.-Y.D.Y. & Banthia, N., Mechanical properties of ultra-high-performance fiber- reinforced concrete: A review. Cem Concr Compos, 73, pp. 267–280, 2016 October. [Crossref]
[3] Nicolaides, D., Kanellopoulos, A., Savva, P. & Petrou, M., Experimental field investi- gation of impact and blast load resistance of Ultra High Performance Fibre Reinforced Cementitious Composites (UHPFRCCs). Constr Build Mater, 95, pp. 566–574, 2015 October. [Crossref]
[4] Nicolaides, D., Kanellopoulos, A., Petrou, M., Savva, P. & Mina, A., Development of a new Ultra High Performance Fibre Reinforced Cementitious Composite (UHPFRCC) for impact and blast protection of structures. Constr Build Mater, 95, pp. 667–674, 2015 October. [Crossref]
[5] Yoo, D.-Y., Kang, S.-T. & Yoon, Y.-S. Effect of fiber length and placement method on flexural behavior, tension-softening curve, and fiber distribution characteristics of UHPFRC. Constr Build Mater, 64, pp. 67–81, 2014 August. https://doi.org/10.1016/ pii/S0950061814003249
[6] Lovichova, R., Fornusek, J., Mara, M., Kocova, M. & Rihova, Z., The fibre orienta- tion influence in cementitious composite against extreme load resistance. IOP Conf Ser Mater Sci Eng, 307(1), p. 012069, 2018 February. 899X/307/1/012069 [Crossref]
[7] Fornůsek, J. & Tvarog, M., Influence of casting direction on fracture energy of fiber- reinforced cement composites. Key Eng Mater, 594–595, pp. 444–448, 2013 December. [Crossref]
[8] Stiel, T., Karihaloo, B.L. & Fehling, E., Effect of casting direction on the mechanical properties of CARDIFRC. In Proceedings of the International Symposium on Ultra High Performance Concrete. pp. 481–493, 2004.
[9] Lovichová, R., Takáčová, K., Künzel, K., Papež, V., Mára, M., Fornůsek, J., et al., Directed orientation of steel fibres in ultra-high-performance cementitious composite using the magnetic field. WIT Trans Built Environ, 196, pp. 39–49, 2020.
[10] Lovichova, R., Fornůsek, J., Soukupová, L. & Valentin, J,. Ultrasound gel as suitable tool for simulation of the fibre orientation in the fibre reinforced concrete. In 54th In- ternational Conference on Experimental Stress Analysis. Czech Society for Mechanics, pp. 1–4, 2016. http://experimentalni-mechanika.cz/cs/konference/konference/2016
[11] Bažantová, Z., Kolář, K., Konvalinka, P. & Litoš, J., Multi-functional high-performance cement based composite. Key Eng Mater, 677, pp. 53–56, 2016 January.
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Takáčová, K., Künzel, K., Papež, V., Konrád, P., Mára, M., Fornŭsek, J., Kheml, P., & Sovják, R. (2022). Applicability of Magnetic Field for Directed Orientation of Steel Fibres in High-Performing Cementitious Composites. Int. J. Comput. Methods Exp. Meas., 10(2), 131-145. https://doi.org/10.2495/CMEM-V10-N2-131-145
K. Takáčová, K. Künzel, V. Papež, P. Konrád, M. Mára, J. Fornŭsek, P. Kheml, and R. Sovják, "Applicability of Magnetic Field for Directed Orientation of Steel Fibres in High-Performing Cementitious Composites," Int. J. Comput. Methods Exp. Meas., vol. 10, no. 2, pp. 131-145, 2022. https://doi.org/10.2495/CMEM-V10-N2-131-145
@research-article{Takáčová2022ApplicabilityOM,
title={Applicability of Magnetic Field for Directed Orientation of Steel Fibres in High-Performing Cementitious Composites},
author={KristýNa TakáčOvá and Karel KüNzel and VáClav Papež and Petr KonráD and Michal MáRa and JindřIch FornŭSek and PřEmysl Kheml and Radoslav SovjáK},
journal={International Journal of Computational Methods and Experimental Measurements},
year={2022},
page={131-145},
doi={https://doi.org/10.2495/CMEM-V10-N2-131-145}
}
KristýNa TakáčOvá, et al. "Applicability of Magnetic Field for Directed Orientation of Steel Fibres in High-Performing Cementitious Composites." International Journal of Computational Methods and Experimental Measurements, v 10, pp 131-145. doi: https://doi.org/10.2495/CMEM-V10-N2-131-145
KristýNa TakáčOvá, Karel KüNzel, VáClav Papež, Petr KonráD, Michal MáRa, JindřIch FornŭSek, PřEmysl Kheml and Radoslav SovjáK. "Applicability of Magnetic Field for Directed Orientation of Steel Fibres in High-Performing Cementitious Composites." International Journal of Computational Methods and Experimental Measurements, 10, (2022): 131-145. doi: https://doi.org/10.2495/CMEM-V10-N2-131-145
TAKÁČOVÁ K， KÜNZEL K， Papež V.， et al. Applicability of Magnetic Field for Directed Orientation of Steel Fibres in High-Performing Cementitious Composites[J]. International Journal of Computational Methods and Experimental Measurements， 2022， 10(2)： 131-145. https://doi.org/10.2495/CMEM-V10-N2-131-145