The flexural behavior of multi-layer high performance self-compacting hybrid fibers concrete slabs

Fiber concretes are a new type of composite material in the manufacturing industry, due to lack of information, identification behavioral characteristics requires laboratory studies. In this research, the bending behavior one layer and multi-layer slabs made with high performance self-compacting concrete reinforced by steel and plastic fibers has been studied. The slabs made in this study differ from 10 models, 4 models one layer and 6 models with three layers make-up, in which the type and volume the fibers vary in layers. Two sample were made from each model and a total 20 slab samples with dimensions 40*40*7.5 cm the three-point bending test slab were performed, in order to evaluate the effect adding steel and plastic fibers and their layout on the bending behavior of the slabs. The results showed that the steel fibers can significantly improve the bending behavior of the slabs, so that, after the first cracking crack, the cracking was done on the cracks and its extension was prevented, the creep behavior the unbleached concrete slabs They have increased their bending strength and ductility considerably. If plastic fibers were much less effective than steel fibers. The flexural behavior three-layer slabs with a fixed volume fibers distributed in such a way that the percentage fibers in the outer layers is more than the middle layer, improved compared to single-layer slabs, which can be due to an increase in the percentage fibers In the outer layers, because these layers are more tense than the middle layer.