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1. Fiber-reinforcedFiber-reinforced
concreteconcrete
Presented By – Partha Sarathi De

2. History
 Fibers have been used as reinforcement since
ancient times.
 Horsehair was used in mortar and straw in mud
bricks.
 In the 1950s, the concept of composite materials
came .
 Steel , Glass fibers have been used to improve the
properties of concrete for the past 30 to 40 years.

3. Introduction
Normal concrete:
 Coarse aggregate
(4.75 – 80mm)
 Fine aggregate
(0.075 – 4.75mm)
 Cement
 Water

4. Introduction
Normal concrete:
 Coarse aggregate
(4.75 – 80mm)
 Fine aggregate
(0.075 – 4.75mm)
 Cement
 Water
Substitute

5. Introduction
 Normal Concrete
• Compression
• Tension
Fiber-reinforced concrete
• Compression
• Tension (more than normal concrete)

6. Special Concrete
Fiber is a small piece of reinforcing material which
increases structural integrity.
It contains short discrete fibers that are uniformly
distributed and randomly oriented.
Fiber-reinforced concreteFiber-reinforced concrete

7. Types of Fiber
Steel fibers Glass fibers Polypropylene fibers
Coir HayNylon fibers

8. Types of Fiber
Steel fibers
Aspect ratios of 30 to 250.
Diameters vary from 0.25 mm
to 0.75 mm.
High structural strength.
Reduced crack
Improving durability.
Use: precast and structural applications, highway and
airport pavements, canal linings, industrial flooring,
bridge decks, etc.

9. Types of Fiber
Glass fibers
High tensile strength
Fibers of length 25mm
Improvement in impact strength
Increase flexural strength
Increase Ductility
Resistance to thermal shock.
Use : Formwork, swimming pools, roofs etc.

10. Types of Fiber
Synthetic fibers
Man- made fibers from textile
and petrochemical industries.
Cheap, abundantly available.
High chemical resistance.
High melting point.
It’s types carbon, nylon, polyester,
polyethylene, polypropylene etc.
Use : panels and shotcrete.

11. Types of Fiber
Natural fibers
low cost and low level of
energy using local
manpower and technology.
High impact strength.
Examples : Jute, coir and bamboo

12. Advantages
 Increase tensile strength
 Reduce steel reinforcement
 Reduce crack widths
 Improving durability
 Improve mix cohesion
 Improve fire resistance
 Improve structural strength
 Increase resistance to plastic shrinkage
 Improve freeze-thaw resistance
 Improve ductility

13. Toughening mechanism
Toughness is ability of a material to absorb energy
and plastically deform without fracturing.
 It can also be defined as resistance to fracture of a
material when stressed.

14. Using fibers for concrete
reinforcement
. Fibers + Concrete
Although cracks exist,
Effect of the size of
cracks may become small
Reduce the spacing of
fibers
Increase the addition of
fibers (fiber content)

15. Simplified model of fiber reinforcement :
Failure by:
Fiber in tension
Interface in bond
Concrete
ConcreteFiber
Tensile
Force

16. Fiber length
 Fiber length – 1.5 times of maximum size of aggregate
 30mm or more is generally recommended
 60mm fiber (high reinforcing effect are used for slab)

17. Factors affecting the Properties of FRC
Volume of fibers
Aspect ratio of fiber
Orientation of fiber
Relative fiber matrix

18. Factors effecting the properties of FRC
Volume of fibers:
low volume fraction (less then 1%):
Slabs , pavement that have large exposed surface
Moderate volume fraction(between 1 and 2%):
Shotcrete
 High volume fraction(greater then 2%):
High performance FRC

19. Factors effecting the properties of FRC
Volume of fiber:

20. Factors effecting the properties of FRC
Aspect ratio of fiber:
Ratio between length and diameter (L/d) of fiber.
Aspect ratio up to 75 (increase in relative strength
and toughness).
Aspect ratio beyond 75 (decrease in relative strength
and toughness).

21. Factors effecting the properties of FRC
Orientation of fiber:
1.Aligned parallel to load
2.Aligned perpendicular to load
3.Randomly distribution
Parallel Perpendicular Randomly
Aligned parallel to load > Randomly and perpendicular
distributed (tensile strength and toughness)

22. Factors effecting the properties of FRC
Relative fiber matrix:
Low modulus of fibers imparts - more energy absorption
High modulus fibers imparts - strength and stiffness
Low modulus fibers ( Nylons and Polypropylene fibers)
High modulus fibers ( Steel, Glass, and Carbon fibers)

23. Increase in compressive strength of concrete

24. Increase in compressive strength of concrete

25. Increase in impact strength of concrete