Steel fiber concrete is one of the special concrete that normal concrete mix with discontinuous discrete steel fiber. There are abundant of small-scale fibers are distribute randomly during the concrete mix.

The evolution of using steel fibers in the field is to replace and reduce the traditional reinforcement bar in the concrete members .Thus steel fiber tend to increase the tensile strength of the concrete by deflecting micro cracks which develop in the concrete under exterior force and load effects. The lengths of the steel fibers are usually small and short, this is because it wants to avoid inadequate work ability of the Concrete mixture.

What Is Steel Fiber?

The steel fiber geometry, mixing technique, content, size and shape of aggregates decide the fiber distribution efficiency. Steel fibers are short, length is discrete and has an aspect ratio in the range 20-100 with diameter ranging between 0.15 mm to 1 mm . When steel fibers are added to concrete mix they are uniformly distributed and randomly dispersed. This is then called steel fiber reinforced concrete. SFRC shows a marked increase in impact, strength, toughness ductility, tensile toughness and flexural strength properties compared to plain concrete. But creep and shrinkage are unaffected by adding steel fiber. SFRC is very effective in controlling the progress of crack into becoming visible cracks, and also improves impact and abrasion resistance. Steel fibers come in various shapes and qualities. Like with any other reinforcement, it is important to provide the required amount of fibers in a given section. However, it is not only the fiber dosage that governs the mechanical response of SFRC.

Objective

The objective carry this research is to identify the steel fiber that affects the performance of the steel fiber concrete which compare with the normal straight steel fibers.

Challenge

The challenge of using the straight steel fiber is the fiber may assemble at one location where they cannot function properly which is used as load transfer.

Performance

Since steel fibers consists of weight, during the mix the fibers will tend to stick to the sides in the rotary mixer, as the final result the performance of the steel fiber concrete cannot be greatly increase yet waste of the dosage of the addition.

Orientation

The closed loop steel fibers are cast in random layer; this is to make sure the orientation of the steel fiber will not change significantly due to the compaction.

The function of the fibers is to lock the coarse aggregate together and prevent the propagation and opening of micro cracks. Tensile forces are transferred across the crack by the fibers resulting in lower stress concentrations at the crack-end, thus inhibiting crack growth. The steel fibers become load carrying and replace conventional reinforcement.

Other factors that influence the mechanical response are:

  • Length

    Fiber length typically from 30 mm to 60 mm

  • Diameter

    Fiber diameter typically from 0.3 mm to a maximum of 1.3 mm

  • Shape

    Fiber shape straight, hooked, undulated, crimped, twisted, coned

  • Tensile Strength

    Fiber tensile strength depends on material quality and ranges approximately from 800 MPa to 2500 MPa.

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