This document discusses the history and uses of fiber-reinforced concrete (FRC). It describes various fiber types including steel, glass, synthetic, and natural fibers. Steel fibers improve crack control and durability while glass fibers increase strength and ductility. Synthetic fibers like polypropylene provide chemical resistance. FRC exhibits higher compressive strength and flexibility compared to plain concrete. Factors like fiber volume and orientation affect FRC properties. Advantages include increased strength and toughness without corrosion. Applications include pavements, tunnels, dams, and precast construction. Research continues into developing advanced FRC materials.

2. CONTENT
History.
Why Fibers are used?
Type of fibers.
Mechanical properties of FRC.
Factors affecting properties of FRC.
Advantages and Disadvantages of FRC.
Applications of FRC.

3.  The use of fibers goes back at least 3500 years, when straw was used to reinforce
sun-baked bricks in Mesopotamia.
 Horsehair was used in mortar and straw in mud bricks.
 Abestos fibers were used in concrete in the early 1900.
 Steel , Glass and synthetic fibers have been used to improve the properties of
concrete for the past 30 or 40 years.
 Research into new fiber-reinforced concretes continues even today.
HISTORY

4. WHY FIBRES ARE USED?
o To bridge the cracks that develop in concrete and increase the ductility.
oImprovement in the post-cracking behavior of concrete containing fibers due to both
plastic shrinkage and drying shrinkage.
o They also reduce the permeability of concrete and thus reduce bleeding of water.
o Imparts more resistance to Impact load.

5. TYPES OF FIBRES
o STEEL FIBRES
o CARBON FIBRES
o GLASS FIBRES
o POLYPROPYLENE FIBRES
o NYLON FIBRES
o CELLULOSE FIBRES
o COIR
o HAY
o BAMBOO FIBRES

6. STEEL FIBRES
1. Aspect ratios of 30 to 250.
2. Diameters vary from 0.25 mm to 0.75 mm.
3. High structural strength.
4. Reduced crack widths and control the crack widths tightly, thus improving durability.
5. Improve impact and abrasion resistance.
6.Used in precast and structural applications, highway and airport pavements, refractory and
canal linings, industrial flooring, bridge decks, etc.

7. GLASS FIBRES
1. High tensile strength, 1020 to 4080 N/mm2
2. Generally, fibers of length 25mm
3. Improvement in impact strength.
4. Increased flexural strength, ductility and resistance to thermal shock.
5. Used in formwork, swimming pools, ducts and roofs, sewer lining etc.

8. SYNTHETIC FIBRES
1.Man- made fibers from petrochemical
and textile industries.
2. Cheap, abundantly available.
3. High chemical resistance.
4. High melting point.
5. Low modulus of elasticity.
6. It’s types are acrylic, aramid , carbon, nylon, polyester, polyethylene, polypropylene, etc.
7. Applications in cladding panels and shotcrete.

9. NATURAL FIBRES
1. Obtained at low cost and low level of energy using local manpower and technology.
2. Jute, coir and bamboo are examples.
3. They may undergo organic decay.
4. Low modulus of elasticity, high impact strength.
HAY
COIR

10. MECHANICAL PROPERTIES OF FRC
1. Improvement of compressive strength values up to 15 percent.
2. Modulus of elasticity of FRC increases slightly with an increase in the fibres content.
3. Flexural strength was reported to be increased by 2.5 times using 4 percent fibres.
4. For FRC, toughness is about 10 to 40 times that of plain concrete.
5.The impact strength for fibrous concrete is generally 5 to 10 times that of plain concrete depending on
the volume of fibre.

11. MECHANICAL PROPERTIES OF FRC

12. MECHANICAL PROPERTIES OF FRC
Specimens without fibers Specimens with fibers
AFTER COMPRESSION TEST

13. FACTORS AFFECTING PROPERTIES OF FRC
1. Volume of fibers
2. Aspect ratio of fiber
3. Orientation of fiber
4. Relative fiber matrix stiffness

14. ADVANTAGES OF FRC
1. High modulus of elasticity.
2. Does not rust nor corrode and requires no minimum cover.
3.Ideal aspect ratio (i.e. relationship between Fiber diameter and length) which makes them excellent for
early-age performance.
4. Easily placed, Cast, Sprayed and less labor intensive than placing rebar.
5. Greater retained toughness in conventional concrete mixes.
6. Higher flexural strength, depending on addition rate.
7. FRC possesses enough plasticity to go under large deformation once the peak load has been reached.

15. DISADVANTAGES OF FRC
1. Greater reduction of workability.
2. High cost of materials.
3.Generally fibers do not increase the flexural strength of concrete, and so cannot replace moment
resisting or structural steel reinforcement.

16. APPLICATIONS
1. Runway,Aircraft Parking, and Pavements.
2. Tunnel Lining and Slope Stabilization.
3. Dams and Hydraulic Structure.
4. Thin Shell, Walls, Pipes, and Manholes.
5. Agriculture
6. Precast Concrete and Products
7. Commercial
8. Residential
9. Warehouse / Industrial

17. RECENT ADVANCEMENTS
TRANSPARENT PANELS

18. RECENT ADVANCEMENTS

19. For any mistakes and suggestions feel free to text here
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