4.4 Experimental set-up
4.4.1 Types of steel fibres used in experiments
The length and the weight of 48 fibres of one fibre type were determined. An
‘equivalent fibre diameter’ [CUR-Recommendation 35, 1994] was calculated with the
assumption that the fibres are straight and round. Table 4.2 shows the characteristics of
the applied steel fibres (first index: Lf/df; second index: Lf). The fibres differ in several
ways; steel fibres with deviating minimum tensile strengths were applied. The Eurosteel
50/50 steel fibre is round and wave-shaped. The Harex 01/32-fibres are milled chips
and are cut from steel. They are twisted and deformed at the ends. Dramix OL13/0.16
and Dramix OL6/0.16 steel fibres are straight without any deformation. The other fibre
types are deformed at their ends (hooked ends) and, as Table 4.2 shows, some are
glued in bundles to avoid fibre clustering during the mixing stage