• A1: Model Yu 1 (Equation 4.9, cylinders), experimental PD, excl. wall-effect:
The packing density of the fibres was obtained from packing experiments (K=3.6). The equivalent packing diameter (Equation 4.9) was calculated. No wall-effect (kSF=1.0) was included for the estimation of the virtual packing density, which means that the experimental result was not adjusted for the wall-effect.
• A2: Model Yu 1 (Equation 4.9, cylinders), analytical PD, incl. wall-effect: Equation 4.9 (model Yu 1) was adopted; the maximum (virtual) packing density of each fibre type was applied (numerical solution from solver of the study on the wall-effect). No adjustment for the effect of the walls was made.
• A3: Model Yu 1 (Equation 4.9, cylinders), experimental. PD, incl. wall-effect: The virtual packing density of the steel fibres was calculated from the experimental packing density under consideration of the wall-effect (experimental results: Fig. 4.2) and the applied compaction process (K=3.6).
• A4: Model Yu 2 (Equation 4.10, convex shape), experimental PD, excl. wall- effect:
Equation 4.10 was applied to include the fibres into the CPM. The experimental packing density (K=3.6) was not adjusted for the wall-effect of the container (kSF=1.0).
• A5: Model De Larrard (kF = 0.065), concept ‘perturbed zone’:
De Larrard [1999] proposed the concept of the perturbed zone to include steel fibres into the CPM, which takes into account the wall-effect of each fibre in the vicinity of an aggregate grain.