What are common types of fibers used in FRC?

What are common types of fibers used in FRC?

• A. Steel, synthetic, glass, and natural fibers
• B. Wood fibers only
• C. Rubber fibers only
• D. Ceramic fibers only

Answer: (A)

Fibers in fiber reinforced concrete come in several broad families that are used to boost toughness, control cracking, and improve post-crack strength. The common types you’ll see in FRC are steel fibers, synthetic fibers, glass fibers, and natural fibers. Steel fibers add high strength and stiffness, helping to carry load after cracking and increasing overall toughness, which is especially beneficial in slabs and structural members. Synthetic fibers, such as polypropylene, polyethylene, or PVA, are versatile and cost-effective for reducing plastic shrinkage cracks and improving ductility and crack resistance, often at a lower material cost. Glass fibers (used in GFRC) contribute to higher tensile strength and stiffness and can enhance durability and surface finish. Natural fibers, like cellulose, sisal, or jute, offer a more sustainable option and can reduce weight and cost in some mixes, though they may require special considerations for durability in alkaline concrete. Other options like wood fibers, rubber fibers, or ceramic fibers aren’t standard for typical FRC applications, so they aren’t considered common choices in this context.

Fibers in fiber reinforced concrete come in several broad families that are used to boost toughness, control cracking, and improve post-crack strength. The common types you’ll see in FRC are steel fibers, synthetic fibers, glass fibers, and natural fibers.

Steel fibers add high strength and stiffness, helping to carry load after cracking and increasing overall toughness, which is especially beneficial in slabs and structural members. Synthetic fibers, such as polypropylene, polyethylene, or PVA, are versatile and cost-effective for reducing plastic shrinkage cracks and improving ductility and crack resistance, often at a lower material cost. Glass fibers (used in GFRC) contribute to higher tensile strength and stiffness and can enhance durability and surface finish. Natural fibers, like cellulose, sisal, or jute, offer a more sustainable option and can reduce weight and cost in some mixes, though they may require special considerations for durability in alkaline concrete.

Other options like wood fibers, rubber fibers, or ceramic fibers aren’t standard for typical FRC applications, so they aren’t considered common choices in this context.