glass concreate

1. Glass Fibers
Reinforced Concrete
Submitted to : Er Qadir Raza Presented by : Archana
(1271900012)

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 fibers

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 increases the tensile strength of the concrete
▪ 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
▪ Volume of fiber
▪ Aspect ratio of fiber
▪ Orientation of fiber
▪ Workability and compaction of concrete
▪ Size of coarse aggregate
▪ Mixing

6. VOLUME OF FIBER
• Low volume fraction (less than 1%)
• Used in slab and pavement that have large exposed surface leading to high
shrinkage cracking
• Moderate volume fraction(between 1 and 2 percent)
• Used in Construction method such as Shortcrete & in Structures which
requires improved capacity against delamination, spalling & fatigue
• High volume fraction(greater than 2%)
• Used in making high performance fiber reinforced composites (HPFRC)

7. ASPECT RATIO OF FIBER
• It is defined as ratio of length of fiber to it’s diameter (L/d).
• Increase in the aspect ratio upto 75,there is increase in relative strength
and toughness.
• Beyond 75 of aspect ratio there is decrease in aspect ratio and toughness.

8. ORIENTATION OF FIBERS
• Aligned in the direction of load
• Aligned in the direction perpendicular to load
• Randomly distribution of fibers
• It is observed that fibers aligned parallel to applied load offered more
tensile strength and toughness than randomly distributed or perpendicular
fibers.

9. Types of FRC
▪ Steel Fiber Reinforced Concrete
▪ Polypropylene Fiber Reinforced (PFR) cement mortar & concrete
▪ Glass-Fiber Reinforced Concrete
▪ Asbestos Fibers
▪ Carbon Fibers
▪ Organic Fibers

10. Steel Fiber Aspect ratio
30 to 250 Diameters vary
from 0.25 mm to 0.75 mm
Hooks are provided at the
ends to improve bond with
the matrix

11. Polypropylene Fiber
Cheapest &
abundantly available
resistant to most
chemical
High melting point
(about 165 degrees
centigrade)
volume fractions
between 0.5 to 15
commercially used in
concrete

12. 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 fibers of a length of
25mm by conventional
mixing techniques

13. Asbestos fibers
naturally available inexpensive
mineral fiber thermal
mechanical & chemical
resistance low impact strength
due to short length

14. Carbon fibers
very high modulus of elasticity and flexural strength
Expansive strength & stiffness characteristics have
been found to be superior even to those of steel they
are vulnerable to damage than even glass fiber and
hence are generally treated with resign coating

15. Organic fibers
Chemically more inert
Than either steel or
glass fibers Cheaper

16. Glass fibers
▪ Glass fiber is chemical inorganic fiber, obtained from molten glass of a specific
composition
▪ Glass fiber is made of natural materials, so that its products are ecologically pure and
not harmful to human health
▪ High bending, pulling, and pressure resistance, high temperature resistance, low
hydroscopy, resistance against chemical and biological influences, comparatively low
density
▪ Glass fiber products have excellent electronic, heat, and sound insulation capacities

17. 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

18. Types of 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)

19. Properties of Glass fiber
▪ A high tensile strength (1700 N/mm^2)
▪ High modulus ▪ Impact Resistance
▪ Shear strength ▪ Water resistant
▪ Thermal conductivity
▪ 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

20. 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

21. Applications
▪ Exterior Ornamentation
▪ Interior Details
▪ Architectural projects
▪ Airfields and Runways
▪ In Rocket launch pads

22. Repair executed using GFRC

23. THANK YOU