Fiber types for use in fiber reinforced concrete applications come in assorted sizes, shapes, colors and flavors. For additional literature and dosage recommendations, please contact the appropriate manufacturer.

  • Cellulose Fibers: Manufactured from processed wood pulp products, cellulose fibers are used in a similar manner as micro-synthetic fibers for the control and mitigation of plastic shrinkage cracking.

  • Glass Fibers: Glass fiber reinforced concrete (GFRC) has been predominantly used in architectural applications and modified cement-based panel structures.

  • Macro-Synthetic Fibers: This newer class of fibers has emerged over the last 15 years as a suitable alternative to steel fibers when dosed properly. Typical materials include polypropylene and other polymer blends with the same physical characteristics (e.g., length, shape) as steel fibers. These fibers can be dosed from 3 to 20 lbs/yd (1.8 to 12 kg/m3).

  • Micro-Synthetic Fibers: These fibers are generally used for the protection and mitigation of plastic shrinkage cracking in concrete. Most fiber types are manufactured from polypropylene, polyethylene, polyester, nylon and other synthetic materials, such as carbon, aramid and acrylics. These fiber types are generally dosed at low volumes ranging from 0.03 to 0.2% by volume of concrete – 0.5 to 3.0 lbs/yd (0.3 to 0.9 kg/m3).

  • Cellulose Fibers: Manufactured from processed wood pulp products, cellulose fibers are used in a similar manner as micro-synthetic fibers for the control and mitigation of plastic shrinkage cracking

  • Natural Fibers: Natural fibers are used to reinforce cement-based products in non-commercial applications worldwide. They include such materials as coconut, sisal, jute and sugarcane, and come in varying lengths, geometries and material characteristics.

  • Poly-Vinyl Alcohol (PVA) Fibers: PVA fibers are synthetic-made fibers that can alter the flexural and compressive performance of concrete when used at higher volumes.

  • Specialty Fibers: This classification of fibers covers materials not described in this section, and generally pertains to newly manufactured or specified materials not common to these categories.

  • Steel Fibers: These fibers are generally used for providing concrete with enhanced toughness and post-crack load carrying capacity. Typically loose or bundled, these fibers are generally made from carbon or stainless steel, and are shaped into varying geometries such as crimped, hooked-end or wit other mechanical deformations for anchorage in the concrete. Fiber types are classified within ACI 544 as Types I through V, have maximum lengths ranging from 1.5” to 3” (30 to 80 mm), and can be dosed at 10 to 100 lbs/yd (6 to 67 kg/m3).

  • Steel & Micro/Macro Blends: A recent development in the field of fiber reinforced concrete has been the combination or blending of steel and/or macro-synthetic fibers with various types of micro-synthetic fibers. These blends help control plastic shrinkage cracking (i.e., micro-synthetics) while also providing concrete with enhanced toughness and post-crack load carrying capacity achieved only with the use of steel and macro-synthetic fibers. These fibers are typically dosed at the prevailing…[NEED REST OF TEXT]

  • Other Fibers & Blends: These include combinations and types of fibers not classified in this section.