2. INTRODUCTION
• Fiber Reinforced Concrete can be
defined as a composite material
consisting of mixtures of cement,
mortar or concrete and
discontinuous, discrete, uniformly
dispersed suitable fibers.
• Continuous meshes, woven fabrics
and long wires or rods are not
considered to be discrete fibres
3. EFFECT OF FIBERS IN CONCRETE
• They control plastic shrinkage cracking and
drying shrinkage cracking.
• They also lower the permeability of concrete
and thus reduce bleeding of water.
• If the modulus of elasticity of the fiber is
higher than the matrix (concrete or mortar
binder), they help to carry the load by
increasing the tensile strength of the material.
• Some fibers reduce the strength of concrete.
4. NECESSITY
• It reduce the air voids and water voids the
inherent porosity of gel.
• It increases the durability of the concrete.
• Fibers such as graphite and glass have
excellent resistance to creep.
• The addition of small, closely spaced and
uniformly dispersed fibers to concrete would
act as crack arrester and would substantially
improve its static and dynamic properties.
5. FACTORS EFFECTING PROPERTIES OF FRC
• Relative fiber matrix.
• Volume of fiber.
• Aspect ratio of fiber.
• Orientation of fiber.
• Workability and compaction of concrete.
• Size of coarse aggregate.
• Mixing.
6. THE GFRC
• Glass Fiber Made up from 200- 400 individual
filaments can be chopped into various lengths,
or combined to make cloth mat or tape not
possible to mix more than about 2% (by
volume) of fibres of a length of 25mm by
conventional mixing techniques
7. GLASS FIBER REINFORCED CONCRETE
• GFRC is actually cement mortar with countless
strands of embedded glass fiber.
• GFRC has a dramatically reduced ballistic
debris profile.
• Fibers are the principal load-carrying members
8. TYPES OF GLASS FIBERS
• A-glass (close to normal glass).
• C-glass (resist chemical attacks).
• E-glass (insulation to electricity).
• AE-glass (alkali resistance).
• S-glass (high strength fiber)
9. PROPERTIES OF GLASS FIBER
• A high tensile strength
(1700 N/mm^2) ▪ High
modulus.
• Impact Resistance.
• Shear strength.
• Water resistant.
• Thermal conductivity.
10. PROPERTIES OF GLASS FIBER (COTD.)
• Low thermal expansion.
• Less creep with increase in time.
• Light weight and Low density.
• Resistance to corrosion and Fire endurance.
• Resistance to cracks in concrete
11. CASTING OF GFRC
• Spray-Up (very strong GFRC due to the high
fiber load and long fiber length).
• Premix (less strength than spray-up).
• Hybrid Spray-up GFRC.
