This paper deals with the description, measurement, and use of electromagnetic properties of ferromagnetic fibres used as dispersed fibre reinforcement in composite mixtures. Firstly, the fibres' magnetic properties are shown, and a method of measuring the hysteresis loop of fibres is proposed. The results from the measurements are presented and a discussion of the influence of measured parameters on the fibres' orientation in a magnetic field is performed. Furthermore, methods of non-destructive estimation, of their amount and orientation in the composite specimens, are discussed. The main experimental goal of this paper is to show the relationship between this non-destructive method's results and the destructive flexural strength measurements. The method is sensitive enough to provide information related to fibre reinforcement.

Department of Electrotechnology Faculty of Electrical Engineering Czech Technical University Prague Technická 2 166 27 Prague 6 Czech Republic

Experimental Centre Faculty of Civil Engineering Czech Technical University Prague Thákurova 7 166 29 Prague 6 Czech Republic

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Simulations of the Behaviour of Steel Ferromagnetic Fibres Commonly Used in Concrete in a Magnetic Field