Fibre Reinforced Concrete Guide
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In the world of high performances, we need a different type of concrete to fulfill our expectations. Here is a type of concrete which the world needs to complete their engineering work immaculately.
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Fibre Reinforced Concrete Guide
- 1. CONCRETE TECHNOLOGY Fibre reinforced concrete
- 2. FIBRE REINFORCED CONCRETE Fibre-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibres that are uniformly distributed and randomly oriented. The character of fibre-reinforced concrete changes with varying concretes, fibre materials, geometries, distribution, orientation, and densities.
- 3. NECESSITY OF FRC Increases the tensile strength of the concrete. Reduce the air voids and water voids the inherent porosity of gel. Increases the durability of the concrete. Excellent resistance to creep. Reinforced concrete itself is a composite material. It has been recognized that the addition of small, closely spaced and uniformly dispersed fibres to concrete would act as crack arrester and would substantially improve its static and dynamic properties.
- 4. EFFECTS OF FIBRE IN CONCRETE To control cracking due to plastic and drying shrinkage. To reduce permeability of concrete. To reduce bleeding of water. Greater impact, abrasion and shatter resistance. FRC continue to sustain considerable loads even at deflections considerably in excess of the fracture deflection of the plain concrete.
- 5. TYPES OF FIBRES USED Polypropylene Fibre (PFR) Asbestos Fibres Carbon Fibres Organic Fibres Steel Glass Synthetic Natural
- 6. GLASS FIBRE Recent introduction in FRC. Possesses high-strength Alkali-resistant glass fibre embedded in a concrete matrix. Most commonly used. Improves flexural, impact and fatigue strength. Glued type steel fibres have proven to be the most efficient type. STEEL FIBRE
- 8. NATURAL FIBRE Fibres made by humans with chemical synthesis. More durable, stain and water resistant, but are prone to heat damage. Fibres produced by plants, animals, and geological processes. Lower density and better thermal insulation. SYNTHETIC FIBRE
- 10. CURRENT DEVELOPMENT IN FRC High fibre volume micro-fibre systems. Slurry infiltrated fibre concrete[SIFCON]. Use of plastic fibre to improve fire resistance High Strength Concrete. Compact reinforced composites; 1. Polymer impregnated concrete 2. Polymer cement concrete 3. Polymer concrete 4. Partially impregnated and surface coated surface coated polymer concrete
- 11. FACTORS AFFECTING FRC PROPERTIES Relative fibre matrix stiffness. Volume of fibres. Aspect ratio of the fibre. Orientation of fibre. Workability of concrete. Compaction of concrete. Size of coarse aggregates.
- 12. USES OF FIBRE REINFORCED CONCRETE Landscaping and water features. Sculptures and pre-fabricated rocks. Industrial floorings. Canal and refractory lining. Bridge decks. Road pavements. Overlay of airfields.
- 14. ADVANTAGES Great material for restoration of buildings. GFRC is light weight and is about 75% lighter than traditional concrete. Reinforcement for this concrete is internal and does not require additional reinforcement. It is easy to cut and difficult to crack. GFRC is very adaptable as it can be poured or sprayed.
- 15. COMPARISON FIBRE REINFORCED CONCRETE NORMAL REINFORCED CONCRETE • High durability • Less durability • Protect steel from corrosion • Steel potential to corrosion • Lighter materials • Heavier materials • More expensive • Economical • Greater strength • Less strength • Less workability • High workability
- 16. FRC RCC
- 17. MIXING Needs careful condition to avoid balling of fibers, segregation and mixing the materials uniformly. Increase in the aspect ratio , volume percentage and size and quantity of coarse aggregate increase the balling tendencies. A steel fiber content in excess of 2% by volume and aspect ratio of more than 100 are difficult to mix. It is important that the fibers are dispersed uniformly throughout the mix, which can be done by addition of fibers before water is added.
- 18. TYPICAL PROPORTION Cement content : 325-550 kg/cum W/C ratio : 0.4 to 0.6 Percentage of sand to total aggregate : 50 -100% Maximum aggregate size : 10mm Air content : 6 to 9 % Fibre content : 0.5 – 2.5% by volume of mix
- 19. DISADVANTAGES Greater reduction of workability. High cost of materials. Steel fibres increase the specific gravity of concrete. Corrosion of steel fibres. Steel Fibres do not increase the flexural strength of concrete and so cannot replace moment resisting or structural steel reinforcement. Difficulty in self mixing.
- 20. FUTURE SCOPE AND CURRENT DEVELOPMENTS In certain specific circumstances ,steel fibre or macro synthetic fibres can entirely replace traditional steel reinforcement bar(“rebar”) in reinforced concrete. There are increasing numbers of tunneling projects using precast lining segments reinforced only with steel fibres. Recent studies performed on a high performance fibre- reinforced concrete in bridge deck found that adding fibres provided residual strength and controlled cracking.
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