Fibre reinforced concrete is a composite material consisting of cement, concrete and small fibres distributed throughout for increased strength and crack resistance. The fibres improve tensile strength, flexural strength, impact resistance and durability. Different fibre types include steel, glass, polypropylene and synthetic fibres. The mechanical properties of fibre reinforced concrete depend on fibre type, size, volume and distribution, with higher fibre content increasing tensile strength, flexural strength, toughness and modulus of elasticity. Uniform dispersion of fibres is important to prevent balling during mixing.

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Agarwal
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2. • It is a fibrous material consisting of mixtures of cement,
concrete and uniformly distributed fibres (lending varying
properties) to increase structural integrity.
• The character of concrete changes with varying
concretes, fibre materials, geometries, distribution,
orientation, and densities.
USE OF FIBRES IN CONCRETE:
• Used to control shrinkage and cracking of concrete.
Provides shatter resistance and abrasion.
• Lower permeability of concrete to prevent bleeding of
water.
• Increases Tensile Strength and reduce air and water
voids.

3. THERMAL PROPERTIES:
• High melting point( around 165 degrees Celsius) with a
working temperature of 100 degrees Celsius.
• Constituent polypropylene fibres are hydrophobic and
can be easily mixed.
• Asbestos fibres have thermal resistance .
• Provides thermal insulation, therefore some times used
on facade barely.
BALLING OF FIBRES:
• The mix should have a uniform dispersion of the fibres in
order to prevent segregation or balling of the fibres during
mixing.
• Increase of aspect ratio, volume percentage of fibre, and
size and quantity of coarse aggregate will intensify the
balling tendencies .

4. The mechanical properties of FRC majorly depends on
type and percentage of fibre.
• Compressive Strength: Degree of bearable
compression. The presence of fibres doesn’t have large
effect on compressive strength values (0 to 15 percent).
• Modulus of Elasticity : It increases slightly with an
increase in the fibres content. ( 1 percent increase in fibre
content by volume increase modulus of elasticity by 3
percent).
• Flexure: The stress in a material just before it yields in a
flexure test. (Increase with fibre content i.e. increase by
2.5 times using 4 percent of fibres).
• Toughness: For FRC, toughness is about 10 to 40 times
that of plain concrete.

5. • Fibres with end anchorage (end strength) and high aspect
ratio were found to have improved effectiveness.
• For the same length and diameter, crimped-end fibres can
achieve the same properties as straight fibres using 40
percent less fibres.
Different Types Of Fibres In Concrete:
• It consists of many constituent fibres:
1.Steel Fibres : Straight, crimped, twisted, hooked, ringed,
and paddled ends. Diameter range from 0.25 to 0.76mm.
2. Glass Fibres: Straight. Diameter ranges from 0.005 to
0.015mm.
3. Polypropylene Fibres: Plain, twisted, fibrillated, and with
buttoned ends.
4.Other Synthetic Fibres : Kevlar, nylon, and polyester.
Diameter ranges from 0.02 to 0.38mm.

6. Comparisons Between Fibre Reinforced Concrete &
Standard Concrete:

7. Compressive Strength: Impact Strength:
Tensile Strength: Shear
Strength:

8. GRAPHS:
Volume of fibres

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