INTRODUCINGINTRODUCINGTOTO

FIBRE REINFORCED FIBRE REINFORCED CONCRETECONCRETE

PRESENTED BY:PRESENTED BY:

KAMANASISH BHOWMIKKAMANASISH BHOWMIK

B.E.7B.E.7THTH SEMESTER CIVIL ENGG. SEMESTER CIVIL ENGG.

ENROLLMENT NO:0610128ENROLLMENT NO:0610128

Fiber reinforced concreteFiber reinforced concrete

Fiber reinforced concrete (FRC) is Fiber reinforced concrete (FRC) is concrete containing fibrous material concrete containing fibrous material which increases its structural integrity.which increases its structural integrity.

Historical perspectiveHistorical perspective

BC Horse hair.

Egyptians used straw to reinforce

mud bricks.

1900 asbestos fiber was used to reinforce clay posts.

1960 FRC.

1970 SFRC, GFRC, PPFRC, Shotcrete.

2000+ Structural applications, Code integration, New products.

TYPES OF FIBRE REINFORCED TYPES OF FIBRE REINFORCED CONCRETE(FRC)CONCRETE(FRC)

FR CONCRETE

GLASS FRCONCRETE

PLASTIC FRCONCRETE

STEEL FR CONCRETE

NYLON FR CONCRETE

ORGANIC FR CONCRETE

CARBON FRCONCRETE

GLASS FIBRE REINFORCED GLASS FIBRE REINFORCED CONCRETECONCRETE

Glass fibre manufactured in the Glass fibre manufactured in the form of glass fibre sheet as shown form of glass fibre sheet as shown

in figurein figure

High Zirconia Glass Fibre High Zirconia Glass Fibre Reinforced Concrete (GRC) Reinforced Concrete (GRC)

Alkali Resistant Glass fibre Alkali Resistant Glass fibre Reinforced Concrete (GRC) Reinforced Concrete (GRC)

STEEL FIBRE REINFORCED STEEL FIBRE REINFORCED CONCRETE(SFRC)CONCRETE(SFRC)

Compressive Strength Of SFRC

PLASTIC FIBRE REINFORCED PLASTIC FIBRE REINFORCED CONCRETE(PFRC)CONCRETE(PFRC)

Difference Between Difference Between SFRC and PFRCSFRC and PFRC

SFRCSFRC1)Improving durability is the 1)Improving durability is the

reason of controlling reason of controlling crack width.crack width.

2)Deflection is lower 2)Deflection is lower compared with PFRC.compared with PFRC.

3)It can use in any exposure 3)It can use in any exposure condition.condition.

PFRCPFRC1)Water tightness is the only 1)Water tightness is the only

reason of controlling the reason of controlling the crack width.crack width.

2)Deflection is higher 2)Deflection is higher compared with SFRC.compared with SFRC.

3)It is week is high 3)It is week is high temprature. temprature.

NYLON FIBRE REINFORCED NYLON FIBRE REINFORCED CONCRETECONCRETE

ORGANIC FIBRE ORGANIC FIBRE REINFORCED CONCRETEREINFORCED CONCRETE

Some examples are:Some examples are:

1) JUTE1) JUTE

2) COIR2) COIR

3) CANESPLITS.3) CANESPLITS.

CARBON FIBRE CARBON FIBRE REINFORCED CONCRETEREINFORCED CONCRETE

Tensile strength of 2110 to 2815 N/Sq.mmTensile strength of 2110 to 2815 N/Sq.mm High modulus of Elasicity and flexural strength.High modulus of Elasicity and flexural strength. Posses good durability.Posses good durability.

HYBRID-FIBRE REINFORCEDHYBRID-FIBRE REINFORCEDCONCRETECONCRETE

Hybrid-Fibre Concrete (HFC) contains Hybrid-Fibre Concrete (HFC) contains different types of steel fibres.different types of steel fibres.

Increase the tensile strength and ductility Increase the tensile strength and ductility of the concrete elements .of the concrete elements .

Applied amounts of fibres are relatively Applied amounts of fibres are relatively low, which guarantees good workability low, which guarantees good workability and economically acceptable costs of the and economically acceptable costs of the concrete mixtures. concrete mixtures.

STRENGTH OF FRCSTRENGTH OF FRC

The concrete strength ranged between 80The concrete strength ranged between 80

and 100 MPa.and 100 MPa. post peak strength are enhanced, both in post peak strength are enhanced, both in

tension and in compression. tension and in compression.

Elastic modulus, creep, and drying shrinkage of FRC

Tensile creep is reduced slightly.

Flexural creep can be substantially reduced when very stiff carbon fibers are used.

It has little effect on the modulus of elasticity, drying shrinkage, and compressive creep.

FAILURE MODE OF FRCFAILURE MODE OF FRC

Some developments in fiber Some developments in fiber reinforced concretereinforced concrete

The newly developed FRC named The newly developed FRC named EngineeredEngineered Cementitious CompositeCementitious Composite (ECC)(ECC) . .

It is 500 times more resistant to cracking and It is 500 times more resistant to cracking and 40 percent lighter than traditional concrete. 40 percent lighter than traditional concrete.

ECC can increase the ductility of concrete or ECC can increase the ductility of concrete or standard fiber reinforced concrete. standard fiber reinforced concrete.

ECC also has unique cracking behavior. ECC also has unique cracking behavior.

CURRENT DEVELOPMENTCURRENT DEVELOPMENTIN FRCIN FRC

Three new developments are taking place in Three new developments are taking place in FRC.They are:FRC.They are:

1)High Fibre Volume Micro Fibre1)High Fibre Volume Micro Fibre System.System. 2)Slurry Infiltrated Fibre2)Slurry Infiltrated Fibre Concrete(SIFCON).Concrete(SIFCON). 3)Compact Reinforced Composites.3)Compact Reinforced Composites.

MERITS OF FIBRE REINFORCED MERITS OF FIBRE REINFORCED CONCRETECONCRETE

Lower the permeability of concrete.Lower the permeability of concrete. Reduce bleeding of water.Reduce bleeding of water. It control plastic shrinkage cracking and It control plastic shrinkage cracking and

drying shrinkage cracking.drying shrinkage cracking. It increase the strength of concrete.It increase the strength of concrete. It reduce the flexural creep.It reduce the flexural creep. It resist structures from aggressive It resist structures from aggressive

environment, e.g. high temperatures, environment, e.g. high temperatures, ingress of chlorides and electrical fields.ingress of chlorides and electrical fields.

DEMERITS OF FIBRE DEMERITS OF FIBRE REINFORCED CONCRETEREINFORCED CONCRETE

Not as reliable as steel in high stress/ Not as reliable as steel in high stress/ strain concrete members.strain concrete members.

Good in crack prevention, but if a crack Good in crack prevention, but if a crack does form fiber is not as efficient as does form fiber is not as efficient as controlling the crack.controlling the crack.

Areas of Application of FRC Areas of Application of FRC materialsmaterials

Thin Sheets.Thin Sheets. Roof Tiles.Roof Tiles. Pipes.Pipes. Prefabricated shapes.Prefabricated shapes. Curtain walls.Curtain walls. Precast elements.Precast elements. Impact resisting Impact resisting

structures.structures.

ApplicationApplication ofof Fibre Fibre ReinforcedReinforced Concrete in Civil InfrastructureConcrete in Civil Infrastructure

Repairs of existing constructions.Repairs of existing constructions. Development of new constructions for long Development of new constructions for long

service-life including tunnels.service-life including tunnels. Used in many constructions subjected to Used in many constructions subjected to

the combination of mechanical load and the combination of mechanical load and impact load. impact load.