Concrete lintels reinforced with steel fibres oriented by a magnetic field
Keywords:magnetic, orientation, fibre, align, concrete, lintels, beams
This paper explores the possibility of applying the technique of magnetic orientation of steel fibres for manufacturing a concrete structural element of realistic dimensions, compared to small laboratory specimens. This technique could be a part of an answer to the current need for faster and automated production in the prefabrication industry. The examined specimens have dimensions of commonly used lintels in construction, 80 mm × 100 mm × 980 mm. The properties of specimens with magnetically oriented fibres are compared with same size specimens prefabricated conventionally. The orientation of fibres has been confirmed by Q-factor non-destructive testing method using a measuring coil. All specimens were tested with a four-point bending test. The specimens with oriented fibres show a significantly higher flexural strength, by 150 %, than specimens produced conventionally with the same volume of fibres.
H. Mikulčić, E. Von Berg, M. Vujanović, et al. Numerical modelling of calcination reaction mechanism for cement production. Chemical Engineering Science 69(1):607–615, 2012. https://doi.org/10.1016/j.ces.2011.11.024.
P. K. Mehta, D. Manmohan. Sustainable high-performance concrete structures. Concrete international 28(7):37–42, 2006.
I. L. Larsen, R. T. Thorstensen. The influence of steel fibres on compressive and tensile strength of ultra high performance concrete: A review. Construction and Building Materials 256:119459, 2020. https://doi.org/10.1016/j.conbuildmat.2020.119459.
V. P. Villar, N. F. Medina. Alignment of hooked-end fibres in matrices with similar rheological behaviour to cementitious composites through homogeneous magnetic fields. Construction and Building Materials 163:256–266, 2018. https://doi.org/10.1016/j.conbuildmat.2017.12.084.
M. Hajforoush, A. Kheyroddin, O. Rezaifar. Investigation of engineering properties of steel fiber reinforced concrete exposed to homogeneous magnetic field. Construction and Building Materials 252:119064, 2020. https://doi.org/10.1016/j.conbuildmat.2020.119064.
R. Mu, H. Li, L. Qing, et al. Aligning steel fibers in cement mortar using electro-magnetic field. Construction and Building Materials 131:309–316, 2017. https://doi.org/10.1016/j.conbuildmat.2016.11.081.
A. I. Miller, F. R. Bjorklund. Method of reinforcing concrete with fibres, 1977. US Patent 4,062,913.
W. Xue, J. Chen, F. Xie, B. Feng. Orientation of steel fibers in magnetically driven concrete and mortar. Materials 11(1):170, 2018. https://doi.org/10.3390/ma11010170.
M. Wijffels, R. Wolfs, A. Suiker, T. Salet. Magnetic orientation of steel fibres in self-compacting concrete beams: Effect on failure behaviour. Cement and Concrete Composites 80:342–355, 2017. https://doi.org/10.1016/j.cemconcomp.2017.04.005.
K. Künzel, V. Papež, K. Carrera, et al. Electromagnetic properties of steel fibres for use in cementitious composites, fibre detection and non-destructive testing. Materials 14(9):2131, 2021. https://doi.org/10.3390/ma14092131.
K. Carrera, P. Kheml, R. Sovják, K. Künzel. Rheological properties of sonogel and comparison with rheological properties of high-performance concrete. Materials Today: Proceedings 58:1308–1311, 2022. https://doi.org/10.1016/j.matpr.2022.02.160.
K. Carrera, K. Künzel, P. Konrád, et al. Mechanical properties of high-performance concrete with steel fibres oriented by an electromagnetic field. Journal of Materials in Civil Engineering 34(9):04022199, 2022. https://doi.org/10.1061/(ASCE)MT.1943-5533.0004342.
K. Künzel, V. Papež, K. Carrera, R. Sovják. Magnetic properties of steel fibres commonly used in concrete. Materials Today: Proceedings 62:2599–2603, 2022. https://doi.org/10.1016/j.matpr.2022.04.134.
K. Carrera, R. Sovják, V. Papež, K. Künzel. Quality factor as a tool to measure concentration and orientation of ferromagnetic fibres in sample. Materials Today: Proceedings 62:2624–2627, 2022. https://doi.org/10.1016/j.matpr.2022.04.605.
Copyright (c) 2022 Kristýna Carrera, Karel Künzel, Petr Konrád, Radoslav Sovják, Václav Papež, Michal Mára, Jindřich Fornůsek, Přemysl Kheml
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