Fiber Reinforced Concrete (FRC)

Feisal salah Introduction Is a concrete mix that contains short discrete fibers, uniformly distributed and randomly oriented Aims to produce stronger and tougher concrete Can add to the tensile loading capacity of the composite system 4 types of FRC: Steel Fibers (SFRC) Glass Fibers (GFRC) Synthetic Fibers (SFRC) Natural Fibers (NFRC)

Advantages Ease of installation Concrete placement and crack control in one operation No requirement for crack control steel mesh Increased cohesion of the mix Reduced bleeding of water to the surface

Disadvantages Greater reduction of workability High cost of the materials

Steel Fiber Reinforce Concrete Increases strain capacity and impact resistance Improved resistance to impact and greater ductility of failure in compression, flexure and torsion High tensile strength (0.5 – 2 GPa) Modulus of elasticity (200 GPa) Ductile/plastic stress-strain characteristic Low creep

Glass Fiber Reinforced Concrete Mixed by Portland cement, fine aggregates, water and alkali-resistant glass fibers High tensile strength (2 – 4 GPa) Elastic modulus (70 – 80 GPa) Brittle stress-strain characteristics (2.5 – 4.8% elongation at break) Low creep at room temperature

Synthetic Fiber Reinforced Concrete Man-made fibers from petrochemical and textile industries Low-volume percentage (0.1 to 0.3% by volume) high-volume percentage (0.4 to 0.8% by volume)

Selected Synthetic Fiber Types and Properties

Types of Synthetic Fiber Reinforced Concrete Acrylic Aramid Carbon Nylon Polyester Polyethylene Polypropylene

Natural Fiber Reinforced Concrete Obtained at low cost and low levels of energy using local manpower and technology Unprocessed natural fibers - made with unprocessed natural fibers such as coconut coir, sisal, sugarcane bagasse, bamboo, jute, wood and vegetable Processed natural fibers - Wood cellulose is the most frequently

Typical Properties of Natural Fibers

Application of FRC Applications for new construction Bridge Repair and rehabilitation applications Beam and Slab Architectural applications Interior Design

Use of Carbon FRC as reinforcement of a concrete slab

Comparison Fiber Reinforced Concrete (FRC) Normal Reinforce Concrete Higher durability Lower durability Protect steel from corrosion Steel potential to corrosion Lighter (materials) Heavier (materials) More Expensive Economical With the same of volume, the strength is greater With the same of volume, the strength is less. higher workability Less workability as compare to FRP

Conclusion FRC - very costly - normally apply on bridge constructions - the ability to sustain a load without excessive deformation or failure - used as external reinforcement in the rehabilitation of reinforced concrete (RC) beams and slabs - architects used it as siding/cladding, roofing, flooring and partitions