What is fibre reinforced concrete?

What is fibre reinforced concrete?

Fibre-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibres that are uniformly distributed and randomly oriented. 

Fibres include steel fibres, glass fibres, synthetic fibres and natural fibres – each of which lend varying properties to the concrete. In addition, the character of fibre-reinforced concrete changes with varying concretes, fiber materials, geometries, distribution, orientation, and densities.

Fibres are usually used in concrete to control cracking due to plastic shrinkage and to drying shrinkage. They also reduce the permeability of concrete and thus reduce bleeding of water. Some types of fibres produce greater impact–, abrasion–, and shatter–resistance in concrete. Generally fibres do not increase the flexural strength of concrete, and so cannot replace moment–resisting or structural steel reinforcement. Indeed, some fibres actually reduce the strength of concrete.

Benefits of using Polypropylene and Nylon fibres

  • Improve mix cohesion, improving pumpability over long distances
  • Improve freeze-thaw resistance
  • Improve resistance to explosive spalling in case of a severe fire
  • Improve impact resistance
  • Increase resistance to plastic shrinkage during curing

Benefits of using Steel fibres

  • Improve structural strength
  • Reduce steel reinforcement requirements
  • Improve ductility
  • Reduce crack widths and control the crack widths tightly, thus improving durability
  • Improve impact– and abrasion–resistance
  • Improve freeze-thaw resistance

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