Steel fiber for reinforcing concrete is defined as short, discrete lengths of steel fibers with an aspect ratio (ratio of length to diameter) from about 20 to 100, with different cross sections, and that are sufficiently small to be randomly dispersed in an unhardened concrete mixture using the usual mixing procedures.
Fiber-reinforced concrete (FRC) is concrete containing fibrous material, which increases its structural integrity. It contains short discrete fibers that are uniformly distributed and randomly oriented.
It can be seen that for a constant mixed aspect ratio of fibers, there is an increase in compressive strength of concrete as the percentage of fibers is increased. The results show that in general, there is an increase in compressive strength varying from 1% to 32%, in addition of fibers to the concrete mix.