Abstract:
The potential use of fiber reinforcement for enhancing the mechanical properties of fiber
reinforced concrete had been clearly established and recognized that fiber reinforcement is
an effective way to enhance the fracture toughness of concrete in all modes of failure.
However, most of the published work, has focused exclusively on steel fiber-reinforced
normal strength concrete (SFRC).
This research have been focused on investigating the effect of steel fibers on workability,
compressive strength, splitting tensile strength, and flexural strength of steel fiber reinforced
concrete with varying fraction of fibers (0%, 1%, 1.50%, 2.% and 2.5%) by volume of
concrete. Three Specimens were prepared for each fibers content with high concrete strength
of 40MPa, and 60MPa. The non-fibrous specimen (0% fibers) is used as a controlled concrete
and the comparative study between control specimen and steel fiber reinforced concrete were
done on the mechanical performance of different high strength concrete depending on the
result obtained from the tests. From the research, it was observed that the addition of fibers
reduces workability of wet concrete. Concrete compressive strength decreased from
45.75MPa to 44.52MPa for C 40 and also for C 60 concrete strength decreases from
63.1MPa to 61.78MPa up to 1% but the value was greater than the required grade. The
greater strength improvement was observed for tensile and flexural strength than
compressive strength. The split tensile strength was increased as the percentage of steel fiber
increased in the mix by 1%, 1.5%, 02% and 2.5% Steel Fiber addition. The maximum flexural
strength was found at 2.5% steel fiber addition. Additional load carrying capacity after peak
load is more observed for fiber reinforced concrete than control specimen. The crack
bridging mechanism was more observed when fiber was used.
