The low tensile strength of concrete, attributable to the existence
of micro cracks at the aggregate-matrix interface, is responsible
for crack formation and crack propagation. Discontinuous, discrete
steel fibers of short lengths smaller in diameter have been used to
improve the tensile and flexural strength of structural elements
subjected to various loading conditions. Although the introduction
of fibers into concrete reduces its workability, yet there is a
significant improvement in the material behavior. The brittle
characteristic of concrete is converted into a ductile one. Use of
fibers alters the behavior of the fiber-matrix composite after it
has cracked, thereby improving toughness. The goal of the work is
to establish new relationships and to verify the available
relationships between the various properties of Steel Fiber
Reinforced Concrete (SFRC). Linear relationship between the
flexural tensile strength and cube compressive strength are
proposed for various percentages of fibers. The results indicate
that fiber content in the range of 0.5% to 1% provide excellent
toughness to normal strength concrete as compared to high strength
concrete.
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