Abstract
The results of two-stage experimental studies of the strength and deformation characteristics of fibrous concrete reinforced with steel fiber. In the experiments we used steel fiber with bent ends, which practically does not form hedgehogs, which allows to achieve an even distribution of the fiber by volume. At the first stage, the cube and prismatic strength, deformability at central compression, a number of special characteristics are determined: water absorption, frost resistance, abrasion; the optimal percentage of fiber reinforcement and the maximum size of the coarse aggregate fraction were selected. Fiber reinforcement led to an increase in the strength of concrete at compression by 1,35 times and an increase in the tensile strength at bending by 3,4 times. At the second stage, the creep of fibrous concrete and plain concrete of similar composition at different stress levels was researched. Creep curves are plotted. It is shown that the use of fiber reinforcement leads to a decrease in creep strain by 21 to 30 percent, depending on the stress level.
Highlights
In recent decades, the distinctive feature of the development of industrial production is the use of new materials, and in particular, composites
In order to fill the existing gap, we conducted experimental studies, during which we studied the work of fiber concrete with a long-term load action
In order to compare the results of experimental studies on each stand, two prisms were located in one power row: one of ordinary concrete, and the second of fiber concrete
Summary
The distinctive feature of the development of industrial production is the use of new materials, and in particular, composites. The use of fiber-reinforced concrete in fiber-reinforced concrete structures requires knowledge of a wide range of its physic-mechanical characteristics obtained as a result of laboratory tests. This difference can be explained by a number of objective reasons - the composition of the matrix, the type of fiber and the percentage of fiber reinforcement, the size of the samples, the conditions of the experiment, etc.
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