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Glass fibers reinforced concrete

Abhishek Gupta
Abhishek Gupta

This document discusses glass fiber reinforced concrete (GFRC). It defines GFRC as a composite material made of cement, mortar or concrete mixed with discrete glass fibers. The fibers improve several properties of concrete including tensile strength, durability, and crack resistance. Different types of glass fibers are described as well as factors that influence GFRC properties. Common applications mentioned include architectural elements, interior/exterior details, and fire resistant structures.

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Glass Fibers Reinforced Concrete Presented by: AbhiShek Gupta
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
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
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
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
Types of FRC Steel Fiber Reinforced Concrete Polypropylene Fiber Reinforced (PFR) cement mortar & concrete Glass-Fiber Reinforced Concrete Asbestos Fibers Carbon Fibers Organic Fibers
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
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
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
Asbestos fibers naturally available inexpensive mineral fiber thermal mechanical & chemical resistance low impact strength due to short length
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
Organic fibers chemically more inert than either steel or glass fibers Cheaper
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
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
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)
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
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
Applications Exterior Ornamentation Interior Details Landscape Furnishings Architectural projects Airfields and Runways In Rocket launch pads
Repair executed using GFRC
Architectural projects
Fire resistant structures
The bridge pavilion in Spain (270 m long)
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Glass fibers reinforced concrete

  • 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 Relative fiber matrix Volume of fiber Aspect ratio of fiber Orientation of fiber Workability and compaction of concrete Size of coarse aggregate Mixing
  • 6. Types of FRC Steel Fiber Reinforced Concrete Polypropylene Fiber Reinforced (PFR) cement mortar & concrete Glass-Fiber Reinforced Concrete Asbestos Fibers Carbon Fibers Organic Fibers
  • 7. 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
  • 8. 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
  • 9. 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
  • 10. Asbestos fibers naturally available inexpensive mineral fiber thermal mechanical & chemical resistance low impact strength due to short length
  • 11. 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
  • 12. Organic fibers chemically more inert than either steel or glass fibers Cheaper
  • 13. 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
  • 14. 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
  • 15. 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)
  • 16. 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
  • 17. 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
  • 18. Applications Exterior Ornamentation Interior Details Landscape Furnishings Architectural projects Airfields and Runways In Rocket launch pads
  • 22. The bridge pavilion in Spain (270 m long)