It is well known that concrete is a quasi-brittle material

It is well known that concrete is a quasi-brittle material. Brittleness increases with increasing strength. This may be due to low tensile strength and lack of bonding in the transition zone of the cement matrix which obviously restricts utilization of high strength concrete under static and, in particular, dynamic loading 1–3.
reinforcement of concrete with short randomly distributed fibers can address some of the concerns related to concrete brittleness and its poor resistance to crack growth 4.
The use of conventional reinforcing bars addresses crack arrest at only specific sections and at a single scale. While fiber reinforcement ensures a random distribution of crack arrest zones within concrete,
most fiber reinforced concrete (FRC) mixes are reinforced at only a single scale, containing as they do, only one type of fiber.