STEEL FIBER REINFORCED CONCRETE
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Steel fiber reinforced concrete (SFRC) may be defined
as a composite materials made with Portland cement, aggregate, and
incorporating discrete discontinuous steel fibers. Incorporation of steel fiber
in concrete has found to improve several properties like tensile strength,
cracking resistance, impact and wear resistance, ductility and fatigue
resistance. Steel Fibers are usually used in concrete to control cracking due
to both plastic shrinkage and drying shrinkage. They also reduce the
permeability of concrete and thus reduce bleeding of water. Some types of
fibers produce greater impact, abrasion and shatter resistance in concrete. If
the modulus of elasticity of the fiber is higher than the matrix (concrete or
mortar binder), they help to carry the load by increasing the tensile strength
of the material. However, fibers which are too long tend to "ball" in
the mix and create workability problem.
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