ABSTRACT
For the sake of choosing mix designs for investigation of railway sleepers, the fiber reinforced concretes were tested for fatigue stress and impact resistance. Experimentally have been investigated mechanical properties of steel fibre reinforced prisms before and after cyclic loadings. Fibers were dosaged in the three quantities: 0.9, 1.3 and 1.5 percent by volume. The maximum grain sizes of aggregate were A, 8 and 16 mm. After two months curing the prisms were subjected to 104 cyclic flexural loads.The changes of ultra sonic pulse velocities in specimens and the residual bending strength and working diagrams have been tested. The results of fatigue tests prove that increase or decrease of residual bearing capacity,as measured by toughness indexes in comparison to the monotonic loaded prisms,correlated good with the quantities of fibres.
The impact properties were compared by means of falling weight test.
