Abstract
As a new type of building material, fiber reinforced concrete (FRC) has been widely used in the field of construction engineering. Further analysis of the mechanism of discontinuous fiber improving concrete performance is the key to the preparation and rational application of high performance FRC. The mechanisms of crack resistance, tensile strength and bending resistance of discontinuous fiber reinforced concrete were analysed. The influence factors of fiber reinforced concrete performance were discussed. The results show that fiber length, fiber section shape, fiber volume fraction, fiber orientation and fiber length diameter ratio have significant effects on the performance of concrete. The existence of the fiber group effect leads to the increase of the critical volume fraction of the fiber. The improvement of the tensile strength of the composite was slow down, and it increased nonlinearly with the change of the volume fraction of the fiber. The utilization rate of the fiber decreased greatly. The fiber hybrid effect was the important factor affecting the improvement of concrete performance by fibers. The effective way of discontinuous fiber improving concrete performance is to reduce fiber group effect and use the positive fiber hybrid effect.
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