Fibre Reinforce Concrete

INTRODUCING TO FIBRE REINFORCED CONCRETE PRESENTED BY: KAMANASISH BHOWMIK B.E.7TH SEMESTER CIVIL ENGG. ENROLLMENT NO:0610128

Fiber reinforced concrete  Fiber reinforced concrete (FRC) is

concrete containing fibrous material which increases its structural integrity.

Historical 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 CONCRETE(FRC) FR CONCRETE

GLASS FR CONCRETE

PLASTIC FR CONCRETE

STEEL FR CONCRETE

NYLON FR CONCRETE

ORGANIC FR CONCRETE

CARBON FR CONCRETE

GLASS FIBRE REINFORCED CONCRETE

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

High Zirconia Glass Fibre Reinforced Concrete (GRC)

Alkali Resistant Glass fibre Reinforced Concrete (GRC)

STEEL FIBRE REINFORCED CONCRETE(SFRC)

Compressive Strength Of SFRC

PLASTIC FIBRE REINFORCED CONCRETE(PFRC)

Difference Between SFRC and PFRC SFRC 1)Improving durability is the reason of controlling crack width. 2)Deflection is lower compared with PFRC. 3)It can use in any exposure condition.

PFRC 1)Water tightness is the only reason of controlling the crack width. 2)Deflection is higher compared with SFRC. 3)It is week is high temprature.

NYLON FIBRE REINFORCED CONCRETE

ORGANIC FIBRE REINFORCED CONCRETE  Some examples are:

1) JUTE 2) COIR 3) CANESPLITS.

CARBON FIBRE REINFORCED CONCRETE

  

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

HYBRID-FIBRE REINFORCED CONCRETE  Hybrid-Fibre Concrete (HFC) contains

different types of steel fibres.  Increase the tensile strength and ductility of the concrete elements .  Applied amounts of fibres are relatively low, which guarantees good workability and economically acceptable costs of the concrete mixtures.

STRENGTH OF FRC  The concrete strength ranged between 80

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

Some developments in fiber reinforced concrete    

The newly developed FRC named Engineered Cementitious Composite (ECC) . It is 500 times more resistant to cracking and 40 percent lighter than traditional concrete. ECC can increase the ductility of concrete or standard fiber reinforced concrete. ECC also has unique cracking behavior.

CURRENT DEVELOPMENT IN FRC 

Three new developments are taking place in FRC.They are: 1)High Fibre Volume Micro Fibre System. 2)Slurry Infiltrated Fibre Concrete(SIFCON). 3)Compact Reinforced Composites.

MERITS OF FIBRE REINFORCED CONCRETE  Lower the permeability

of concrete.  Reduce bleeding of water.  It control plastic shrinkage cracking and drying shrinkage cracking.  It increase the strength of concrete.  It reduce the flexural creep.  It resist structures from aggressive environment, e.g. high temperatures, ingress of chlorides and electrical fields.

DEMERITS OF FIBRE REINFORCED CONCRETE  Not as reliable as steel in high stress/

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

Areas of Application of FRC materials       

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

Application of Fibre Reinforced Concrete in Civil Infrastructure  Repairs of existing constructions.  Development of new constructions for long

service-life including tunnels.  Used in many constructions subjected to the combination of mechanical load and impact load.