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fiber reinforced concrete
Ch. Gopi Chand presented on fiber reinforced concrete at Sri Venkateswara Engineering College. Fiber reinforced concrete was developed as a replacement for asbestos fibers in concrete. It involves adding short discrete fibers uniformly throughout a concrete mix. These fibers increase the tensile strength and cracking resistance of concrete. Fiber reinforced concrete has applications in thin sheets, pipes, precast elements, and transparent panels and partitions due to its improved strength and durability properties.
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fiber reinforced concrete
- 1. A PRESENTATION ON FIBERREINFORCED CONCRETE OVER VIEW SRI VENKATESWARA ENGINEERING COLLEGE PRESENTING Internal guide: P.Jhansi mam BY: CH.GOPI CHAND Civil engineering department
- 2. FIBER REINFORCED CONCRETE projectAt : pacific solutions(ECIL) Hyderabad, A.p
- 3. History 1900s, asbestos fiberswere 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 fiberreinforced concretes continues today.
- 4. INTRODUCTION Concrete is oneof 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.
- 7. Types of fibers Fibersinclude 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.
- 8. How is itMade • • • • • ? 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.
- 9. WHY FIBER ? Fibersare 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.
- 10. ADVANTAGES VERY HIGH COMPRESSIONSTRENGTH HIGH TENSILE STRENGTH HIGH ELASTICITY MODULUS DUCTILE BEHAVIOUR HIGH DURABILITY
- 11. Mechanism Of FailureOf Concrete Cylinders Under Compression Testing 1 0% *fiber (control mix 2 3 0.25% fiber 4 0.5% fiber 1.0% fiber *Fiber fraction by weight of cement content
- 12. Mechanism Of FailureOf Concrete Cylinders Under Spilt Tensile Testing 0% fiber (control mix 0.25% fiber 0.50% fiber 1% fiber
- 13. Due to embeddednano 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) .
- 14. AREAS OF APPLICATIONSOF 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
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- 18. Sources Internet: http://www.litracon.hu/ http://www.danubiusmagazin.hu/magazin/tortenelem/uvegbeton _e.html Textbook: Fundamentals of MaterialsScience and Engineering by William D. Callister Jr. and David G. Rethwisch Chapter 15 Technical Journal: Optics and Photonics News September 2008 issue “Using Nano-Optics to Control the Phase of Light”