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Fiber Reinforced Concrete
- 1. fiber reinforced concrete Prepared : Rebaz Rebwar Ali Supervisor :Shamil A. Flamarz
- 2. History 1900s, asbestos fibers were used in concrete. In the 1950s, the concept of composite materials came into being and fiber-reinforced concrete was one of the topics of interest. Once the health risks associated with asbestos were discovered, there was a need to find a replacement for the substance in concrete and other building materials. By the 1960s, steel, glass (GFRC), and synthetic fibers such as polypropylene fibers were used in concrete. Research into new fiber reinforced concretes continues today.
- 3. Introduction Concrete is one of the most versatile building material. Concrete is strong under compression yet weak under tension, brittle and limited ductility material. Therefore, a form of reinforcement is needed, steel bars reinforce concrete against tension only locally. Cracks in reinforced concrete members extend freely until encountering a rebar. The need for Multidirectional and closely spaced reinforcement for concrete arises. FRC is a concrete mix that contains short discrete fibers that are uniformly distributed and randomly oriented.
- 5. Types of fibers: Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers – each of which lend varying properties to the concrete. In addition, the character of fiber- reinforced concrete changes with varying concretes, fiber materials, geometries, distribution, orientation, and densities. the composite (concrete and fibers) termed Vf. Vf , typically ranges from 0.1 to 3%. Aspect ratio (l/d) is calculated by dividing fiber length (l) by its diameter (d). Fibers with a non-circular cross section use an equivalent diameter for the calculation of aspect ratio.
- 6. How is it Made? Mostly the same as regular concrete fibers are spread throughout the aggregate and cement mix. Small layers of the concrete are poured on top of each other and infused with the fibers and are then connected Process is tedious and costly Big reason why this product costs so much.
- 7. WHY FIBER ? Fibers are usually used in concrete to control cracking due to plastic shrinkage and to drying shrinkage. They also reduce the permeability of concrete and thus reduce bleeding of water. Cracks in reinforced concrete members extended freely until encountering a rebar. Fiber reinforced concrete is used when there is requirement for elimination small cracks.
- 8. ADVANTAGES VERY HIGH COMPRESSION STRENGTH HIGH TENSILE STRENGTH HIGH ELASTICITY MODULUS DUCTILE BEHAVIOUR HIGH DURABILITY
- 9. Mechanism Of Failure Of Concrete Cylinders Under Compression Testing”:
- 10. Mechanism Of Failure Of Concrete Cylinders Under Spilt Tensile Testing
- 11. Transparent Concrete: Due to embedded nano optical glass fiber elements usually optical fibers. light is conducted through the stone from one end to the other. For developing transparent concrete by arranging the high numerical aperture Plastic Optical Fibers (POF) .
- 12. AREAS OF APPLICATIONS OF FRC MATERIALS Thin sheets shingles roof tiles pipes prefabricated shapes panels shotcrete curtain walls Slabs on grade precast elements Composite decks Vaults, safes. Impact resisting structures