In the world of high performances, we need a different type of concrete to fulfill our expectations. Here is a type of concrete which the world needs to complete their engineering work immaculately.

1. CONCRETE TECHNOLOGY
Fibre reinforced concrete

2. 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.
 The character of fibre-reinforced concrete changes with
varying concretes, fibre materials, geometries,
distribution, orientation, and densities.

3. NECESSITY OF FRC
 Increases the tensile strength of the concrete.
 Reduce the air voids and water voids the inherent porosity of
gel.
 Increases the durability of the concrete.
 Excellent resistance to creep.
 Reinforced concrete itself is a composite material.
 It has been recognized that the addition of small, closely
spaced and uniformly dispersed fibres to concrete would act
as crack arrester and would substantially improve its static
and dynamic properties.

4. EFFECTS OF FIBRE IN CONCRETE
 To control cracking due to plastic and drying shrinkage.
 To reduce permeability of concrete.
 To reduce bleeding of water.
 Greater impact, abrasion and shatter resistance.
 FRC continue to sustain considerable loads even at
deflections considerably in excess of the fracture deflection
of the plain concrete.

5. TYPES OF FIBRES USED
 Polypropylene Fibre (PFR)
 Asbestos Fibres
 Carbon Fibres
 Organic Fibres
 Steel
 Glass
 Synthetic
 Natural

6. GLASS FIBRE
 Recent introduction in FRC.
 Possesses high-strength
 Alkali-resistant glass fibre embedded in a concrete matrix.
 Most commonly used.
 Improves flexural, impact and fatigue strength.
 Glued type steel fibres have proven to be the most
efficient type.
STEEL FIBRE

7. Glass fibre
Steel fibre

8. NATURAL FIBRE
 Fibres made by humans with chemical synthesis.
 More durable, stain and water resistant, but are prone to
heat damage.
 Fibres produced by plants, animals, and geological processes.
 Lower density and better thermal insulation.
SYNTHETIC FIBRE

9. Synthetic fibre
Natural fibre

10. CURRENT DEVELOPMENT IN FRC
 High fibre volume micro-fibre systems.
 Slurry infiltrated fibre concrete[SIFCON].
 Use of plastic fibre to improve fire resistance High Strength
Concrete.
 Compact reinforced composites;
1. Polymer impregnated concrete
2. Polymer cement concrete
3. Polymer concrete
4. Partially impregnated and surface coated surface coated
polymer concrete

11. FACTORS AFFECTING FRC
PROPERTIES
 Relative fibre matrix stiffness.
 Volume of fibres.
 Aspect ratio of the fibre.
 Orientation of fibre.
 Workability of concrete.
 Compaction of concrete.
 Size of coarse aggregates.

12. USES OF FIBRE REINFORCED
CONCRETE
 Landscaping and water features.
 Sculptures and pre-fabricated rocks.
 Industrial floorings.
 Canal and refractory lining.
 Bridge decks.
 Road pavements.
 Overlay of airfields.

14. ADVANTAGES
 Great material for restoration of buildings.
 GFRC is light weight and is about 75% lighter than
traditional concrete.
 Reinforcement for this concrete is internal and does not
require additional reinforcement.
 It is easy to cut and difficult to crack.
 GFRC is very adaptable as it can be poured or sprayed.

15. COMPARISON
FIBRE REINFORCED
CONCRETE
NORMAL REINFORCED
CONCRETE
• High durability • Less durability
• Protect steel from
corrosion
• Steel potential to
corrosion
• Lighter materials • Heavier materials
• More expensive • Economical
• Greater strength • Less strength
• Less workability • High workability

16. FRC RCC

17. MIXING
 Needs careful condition to avoid balling of fibers,
segregation and mixing the materials uniformly.
 Increase in the aspect ratio , volume percentage and size
and quantity of coarse aggregate increase the balling
tendencies.
 A steel fiber content in excess of 2% by volume and aspect
ratio of more than 100 are difficult to mix.
 It is important that the fibers are dispersed uniformly
throughout the mix, which can be done by addition of fibers
before water is added.

18. TYPICAL PROPORTION
 Cement content : 325-550 kg/cum
 W/C ratio : 0.4 to 0.6
 Percentage of sand to total aggregate : 50 -100%
 Maximum aggregate size : 10mm
 Air content : 6 to 9 %
 Fibre content : 0.5 – 2.5% by volume of mix

19. DISADVANTAGES
 Greater reduction of workability.
 High cost of materials.
 Steel fibres increase the specific gravity of concrete.
 Corrosion of steel fibres.
 Steel Fibres do not increase the flexural strength of concrete
and so cannot replace moment resisting or structural steel
reinforcement.
 Difficulty in self mixing.

20. FUTURE SCOPE AND CURRENT
DEVELOPMENTS
 In certain specific circumstances ,steel fibre or macro
synthetic fibres can entirely replace traditional steel
reinforcement bar(“rebar”) in reinforced concrete.
 There are increasing numbers of tunneling projects
using precast lining segments reinforced only with steel
fibres.
 Recent studies performed on a high performance fibre-
reinforced concrete in bridge deck found that adding
fibres provided residual strength and controlled
cracking.

21. THANKYOU