This document discusses steel fibre reinforced concrete (SFRC). It begins with an introduction to fibre reinforced concrete and why fibres are added to concrete to improve properties. It then classifies fibre types and focuses on SFRC, describing steel fibre types, composition, mixing, and improved properties like tensile strength and impact resistance. Limitations and applications are covered, along with conclusions and references.

1. PRESENTED BY
SIDDHARTH
1DS13CV139
STEEL FIBRE
REINFORCED
CONCRETE
GUIDED BY
DINESH B.R
DEPT. OF CIVIL
ENGINEERING
Dayananda sagar
of engineering
college

2. CONTENTS
 Introduction
 Why to use FRC
 Classification of FRC
 Steel fibre reinforced concrete(SFRC)
 Types of SFRC
 Composition of SFRC
 Solution
 Mixing
 Properties of concrete improved by steel fibres
 Limitation of SFRC
 Application of SFRC
 Conclusion
 References

3. INTRODUCTION
Fibre Reinforced concrete
Fibre reinforced concrete is a composite
material consisting of mixtures of cement,
mortar and discontinuous, discrete,
uniformly dispersed suitable fibres.

4. Why to use FRC
 Plain concrete -
1. brittle material with limited ductility
2. low tensile strength and strain capacity
3. internal micro-cracks are present in that concrete.
 The role of randomly distributed fibres -
1. to build bridge across the cracks and to provide
some post-cracking ductile
2. more tougher
3. more impact resistance
4. more load carrying load

6. CLASSIFICATION OF FRC
 STEEL FIBRE REINFORCED CONCRETE(SFRC)
 GLASS FIBRE REINFORCED CONCRETE(GFRC)
 SYNTHETIC FIBRE REINFORCED CONCRETE(SNFRC)
 NATURAL FIBRE REINFORCED CONCRETE(NFRC)
Recently some new FRC named High Performance
Fibre Reinforced Concrete (HPFRC) and Ultra High
Performance Fibre Reinforced Concrete (UHPFRC)
have introduced which shows significant changes
over plain concrete.

7. DIFFERENT TYPES OF FRC
STEEL FIBRE GLASS FIBRE
SYNTHETIC FIBRENATURAL FIBRE

8. STEEL FIBRE REINFORCED
CONCRETE
IN steel fibre reinforced concrete we use steel as the
fibre for reinforcing so it is called as steel fibre
reinforced concrete (SFRC)

9. TYPES OF STEEL FIBRE
• STRAIGHT STEEL FIBRE
• CRIMPED STEEL FIBRE
• STRANDED STEEL FIBRE
• HOOKED STEEL FIBRE
• TWISTED STEEL FIBRE

10. COMPOSTION OF STEEL
FIBRE
 Generally includes carbon steel or stainless steel.
 The length dimension ranges from 6.4mm to 76mm while the
diameter ranges 0.25mm to 0.75mm.
 The steel fibres are described by a convenient parameter
“aspect ratio”. The aspect ratio is determined by length to
diameter ratio. It varies from 20 to 100.

11. STEEL FIBRE

12. SOLUTION: STEEL FIBRE REINFORCED
CONCRETE

13. MIXING
 Water, cement, aggregates and sand were mixed
for 2 minutes, then steel fibres slowly added.
 Internal vibration was used for the compaction of
concrete or prismatic specimens.
 Slabs used external vibrations.
 Covered with wet cloths.
 Kept at 65% humidity.

14. PROPERTIES OF CONCRETE
IMPROVED BY STEEL FIBRES
 Compressive strength
1. Ultimate strength is only slightly affected by the
presence of steel fibres.
2. Increases compressive strength from 0 to 15%.

16. SFRC:PROPRETIES
 Tensile strength
1. In direct tension, the improvement in strength
from 30-40%
2. In split tensile strength increase from 10-45%.

17. SFRC:PROPERTIES
 FLEXURAL STRENGTH
1. Much greater than in tension or compression
because of ductile behaviour.
2. It changes from 20-100% for addition up to 3%
by total volume of fibres.

18. FLEXURAL

19. SFRC:PROPERTIES
 IMPACT
Under flexural impact
loading the peak load for
SFRC is 40% higher than
the normal concrete.

20. LIMITATION OF SFRC
 More precise compared to normal concrete.
 Unless SF are added in adequate quantity, the desired
improvement cannot be obtained.
 Massive change in the total cost of the construction.
 Corrosion of the surface.
 Proper proportion of steel fibres not used having a problem
in finishing with fibres coming out.

21. APPLICATION OF SFRC
 Industrial flooring
 Canal linings
 Highway and airport pavements
 Precast applications- wall and roofs panels, pipe,
boats, staircase & manhole covers
 Structural applications

24. CONCLUSION
 The efficient utilization of fibrous concrete involves
improved static and dynamic properties like tensile
strength, energy absorbing characteristic, impact
strength and flexural strength.
 At elevated temperature SFRC have more strength
both in compression and tension.
 Cost savings of 10% - 30% over conventional concrete
flooring systems.

25. REFERENCES
 Abid A. Shah, Y. Ribakov, Recent trends in steel fibered high-strength concrete,
Elsevier, Materials and Design 32 (2011), pp 4122–4151
 ACI Committee 544. 1990. State-of-the-Art Report on Fiber Reinforced
Concrete.ACI Manual of Concrete Practice, Part 5, American Concrete Institute,
Detroit,MI, 22 pp
 C.H. Henager , “Steel fibrous shotcrete”. A summary of the State – of – the art
concrete Int. : Design and construction 1981.
 J. Endgington, D.J. Hannant & R.I.T. Williams, “Steel fiber reinforced concrete”
Current paper CP 69/74 Building research establishment Garston Watford 1974.
 C.D. Johnston, “Steel fiber reinforced mortar and concrete”, A review of
mechanical properties. In fiber reinforced concrete ACI – SP 44 – Detroit 1974.
 R.J. Craig, “Structural applications of reinforced steel fibrous concrete”.
Concrete Int. Design and Construction 1984.