FIBRE REINFORCED CONCRETE PRESENTED BY: GOUTAM NANDI M. TECH IN CIVIL, 2 ND SEMESTER. UNIVERSITY ROLL NO: NARULA INSTITUTE OF TECHNOLOGY

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

Historical perspective Horse hair used reinforce plaster. Egyptians used straw to reinforce sun-baked mud bricks. Asbestos fiber was used to reinforce clay posts Romualdi and Batson gave rise to FRC Romualdi and Batson gave rise to FRC SFRC, GFRC, PPFRC, Shotcrete 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

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 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 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 1) JUTE 2) COIR 2) COIR 3) BAMBOO etc. 3) BAMBOO etc.

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. and 100 MPa.  post crack 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 1)High Fibre Volume Micro Fibre System. System. 2)Slurry Infiltrated Fibre 2)Slurry Infiltrated Fibre Concrete(SIFCON). Concrete(SIFCON). 3)Compact Reinforced Composites. 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.

ISO 13270:2013  specifies definitions and symbols, classification and codes, dimensions, masses and permissible variations, inspection methods, packing, delivery and storage for steel fibres for concrete.  fibres intended for use in fibre-reinforced concrete, in all types of concrete and mortar, including sprayed concrete, flooring, precast, in situ and repair concretes.  fibre-reinforced engineering material, such as stainless steel fibre use in reinforced refractory material.