The slabs in the condition "0" were not previously loaded with any external load. The condition "II" corresponded to the
condition of slabs after load with the maximum concentrated force (QII) applied in the center of span and then unloaded. The
bottom layer displaced relative to the top layer (delamination – Fig 5a) in the slabs P1, P4 and P6 after applying force QII,
and the span reinforcement plasticised (Fig. 5b) in the slabs P2 and P5, and the slab P3 was destroyed through shearing.