Fibre Reinforced Concrete

by ABHIJEET KATIYAR May 20, 2020 · MATERIALS / PPT's / RCC

Fibre Reinforced Concrete

Concrete is one of the most widely recognized development materials for the most part delivered by utilizing locally accessible ingredients. The present trend in concrete technology is towards increasing the strength and durability of concrete to meet the demands of modern construction. The main aim of the study is to study the effect of glass fiber and steel Fibres in the concrete.

FRC has high tensile strength and fire-resistant properties thus reducing the loss of damage during fire accidents. In the present work, the strength studies are carried out to compare the glass and steel Fibre concrete. The FRC is added 0.5, 1, 2, and 3% are added for M20 grade concrete. The result shows the percentage increase in compressive strength, flexural strength, and splits tensile strength for 28days.

History

Initially, modern FRC was developed in Japan. But Fibres have been used for concrete reinforcement since prehistoric times though technology has improved significantly, as is applicable for other fields. In the early age, straw and mortar were used for producing mud bricks, and horsehair was used for their reinforcement. As the Fibre technology developed, cement was reinforced by asbestos Fibres in the early twentieth century. While these Fibres help the concrete’s strength they can also make it weaker if too much is used.

Application of FRC

It is used on account of the advantages of increased static and dynamic tensile strength and better fatigue strength. It has been tried on overlays of air-field, road pavements, industrial footings, bridge decks, canal lining, explosive resistant structures, refractory linings, etc. Used for the fabrication of precast products like pipes, boats, beams, staircase steps, wall panels, roof panels, manhole covers, etc. It is also being tried for the manufacture of prefabricated formwork molds of “U” shape for casting lintels and small beams.

Fibre reinforced concrete is used for

Industrial flooring

Sprayed concrete

Slender structures (usually in precast plants)

Fire resistant structures

mortar applications (rehabilitation)

TYPES OF FIBRES

Steel Fibres

Plastic or Polymeric Fibres

Glass Fibres

Carbon Fibres

Natural Fibres

Hybrid Fibres

Steel Fibres

As a rule of thumb, small fibres tend to be used where control of crack propagation is the most important design consideration. High fibre count (number of fibres per kg) permits finer distribution of steel fibre reinforcement throughout the matrix – and consequently, greater crack control during the drying process. On the other hand, because they exhibit better matrix anchorage at high deformations and large crack widths, longer, heavily deformed fibres afford better post-crack “strength”. However, unlike shorter fibres, the dramatically reduced fibre count of longer product yields correspondingly less control of initial crack propagation.

Polymer Fibre

Polymer Fibres are a subset of man-made Fibres, which are based on synthetic chemicals (often from petrochemical sources) rather than arising from natural materials by a purely physical process. These Fibres are made from polyamide-nylon PET or PBT polyester phenol-formaldehyde (PF)polyvinyl chloride Fibre (PVC) vinyon polyolefins (PP and PE) olefin fibre acrylic polyesters, pure polyester PAN Fibres are used to make carbon fibre by roasting them in a low oxygen environment. Traditional acrylic Fibre is used more often as a synthetic replacement for wool. Carbon Fibres and PF Fibres are noted as two resin-based Fibres that are not thermoplastic, most others can be melted aromatic polyamide (aramids) such as Twaron polyethene Elastomers polyurethane Fibre Elastolefin.

Glass Fibre

Glass Fibre (or glass fibre) is a material consisting of numerous extremely fine fibres of glass.

Glassmakers throughout history have experimented with glass Fibres, but mass manufacture of glass Fibre was only made possible with the invention of finer machine tooling.

All Fibres Are Explained In PDF
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Benefits

Improve mix cohesion, improving pump ability over long distances

Improve freeze-thaw resistance

Improve resistance to explosive spelling in case of a severe fire

Improve impact resistance

Increase resistance to plastic shrinkage during curing

Effects of Fiber-reinforced concrete

Improved durability of the structure

Increased tensile and flexural strengths

Higher resistance to later cracking

Improved crack distribution

Reduced shrinkage of early age concrete

Increased fire resistance of concrete

Negative influence on workability

Improved homogeneity of fresh concrete

Conclusion

The efficient utilization of fibrous concrete involves improved static and dynamic properties like tensile strength, energy-absorbing characteristics, Impact strength and fatigue strength.
It also provides an isotropic strength property not common in conventional concrete.

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