GLASS FIBERS REINFORCED

CONCRETE

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

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 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.

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

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 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)

PROPERTIES OF GLASS FIBER

•A high tensile strength (1700 N/mm^2) ▪ High modulus.• Impact Resistance.•Shear strength.•Water resistant.•Thermal conductivity.

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

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.

APPLICATIONS

• Landscape Furnishings.•Architectural projects.•Airfields and Runways.• In Rocket launch pads.

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