Which type of material provides increased abrasion resistance in concrete when used as a fiber?

Steel fibers are commonly used in concrete to enhance its mechanical properties, particularly its abrasion resistance. When added to the concrete mix, steel fibers improve the toughness and impact resistance of the finished product, making it less susceptible to wear from abrasive forces. This is particularly beneficial in applications such as industrial floors, pavements, and structures exposed to heavy traffic or harsh environmental conditions.

The incorporation of steel fibers also helps in controlling cracking, as they can bridge cracks that develop during curing or use. Their high tensile strength contributes to the overall structural integrity and durability of the concrete, making it suitable for demanding applications.

Other materials listed, such as acrylic, carbon, and polyethylene, serve various purposes in concrete applications but do not provide the same level of abrasion resistance that steel fibers offer. Acrylic fibers may enhance plasticizing properties and reduce shrinkage, carbon fibers can improve tensile and flexural strength but are not primarily for abrasion resistance, and polyethylene fibers are used to control plastic shrinkage cracking but lack the robust performance characteristics of steel fibers in terms of abrasion resistance.