Abstract
Fiber reinforced concrete began to appear in the market in the 60s of the last century, and since then the interest in this type of reinforcement has been steadily growing. The article presents the results of studies on the crack resistance of concrete reinforced with polypropylene fibers of various lengths and volume concentrations in fine-grained concrete. Waste from the wet magnetic separation of the Poltava mining and concentration plant was used as an aggregate in the concrete. Polypropylene fibers with the various lengths diameter of 0.2 mm were used for reinforcement. The influence of the length and volume concentration of fibers on the crack resistance of the same strength concrete of was studied. The study results indicate that the increase in the length and volume concentration of fibers, within the limits of the experiment, significantly affects the crack resistance of fine-grained concrete.
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