FIBER REINFORCED CONCRETE

CONSTRUCTION OF MATERIALS CIEN332

BATOOL ALSHAMALI

ABDULAZZIZ ABUHATAB

ALA’A SHEIKH SALEEM ENG. MADIHA ALAMMARI

CONTENTS

I.Definition II.The Differences

Between FRC & RCIII.Matrix Concrete

& Fibers IV. Properties of

FRC V.Griffith Theory VI. Failure of FRC VII.Types of FRC

Definition of FRC FRC is used to increase the tensile strength

and toughness

of concrete.

FRC finds application in

shotcrete, slabs, and

precast concrete

products, and also repair

works to avoid spalling of

concrete from repaired

structures.

Fiber in concrete

sustain large degrees of

deformation of cracks at the bottom.

The existence

of the fiber prevents

the concrete

from completely collapsed.

Improve the crack

propagation char. Of brittle

concrete.

It is different from the classical reinforcement concrete, where the steel bars are placed separately; and the concrete is poured around it, in the case of fiber reinforced concrete short fibers are part of the concrete. The traditions; reinforcing bars or the reinforcement may or may not be there in the concrete structure, depending on the particular application.

[Drawing the failure in RC & FRC]

Matrix Concrete & Fibers

• FRC are discrete, that is the fiber do not lump together; they do not behave as a group together and so on.

• randomly distrusted, that is in all the three directions.

A composite material made using concrete and short, discrete, randomly distributed fibers.

Properties of FEC 1. CONCRETE (w/c, G.max)As the max. aggregate size should match or be close to the size of the fiber.

2.FIBERS

- MATERIAL (glass, steel)

- SHAPE (indented, primed, plain) - SIZE (LENGTH & DIAMETER

Griffith Theory

𝜎=√ 2𝛾 𝐸𝜋 𝑐

E& are constants C is cracking

Strength of brittle materialLow tensile strength due to the existence of large cracking.Reducing the cracks within the concrete, increases the tensile strength.

Failure of FRC •Fiber in tension • Interface in bond •Concrete

Types of Fibers Materials:SteelGlassCarbon Organic Compounds

Thank you!