Abstract
The use of steel fibers as addition improves several mechanical properties of concrete, whose tensile strength and resilience are of great interest for designs of structures subjected to impact loads, such as military facilities, nuclear power plants, bridges and overpasses. However, there are few studies that assessed the effects of adding steel fiber on reinforcements of reinforced concrete. To assess these effects, four concrete beams under impact loads were tested, with reinforcements and different amounts of steel fibers being monitored. The results showed a better performance of beams with fibers, presenting lower strains on reinforcements and cracking.
Highlights
Concrete is the most widely used building material in the world because it is durable and relatively inexpensive
Concrete reinforced with steel fibers is a cement matrix material whose composition receives a certain percentage of short fibers
These values coincided with the values recorded in an auxiliary system, where a pencil was fixed under the beam and brought into contact with a paper during the impact, in which were observed lower values than found in previous impacts
Summary
Concrete is the most widely used building material in the world because it is durable and relatively inexpensive. It is a brittle material that has a low tensile strength and low deformation capacity. In recent years fibers have been added to concrete aiming to obtain a composite with greater tensile strength, resilience, ductility and to retard the propagation of cracks through the matrix. Concrete reinforced with steel fibers is a cement matrix material whose composition receives a certain percentage of short fibers. The most widely used fibers are metallic, glass, synthetic, natural and, more recently, carbon. The steel fibers and glass are the most applied in the construction industry due to the improvement of properties and to their low prices and durability. The ability to absorb energy is the property most benefited by the addition of fibers to cement matrix material
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