FAQs

ASTM A820 is the standard specification for steel fibers to be used in concrete. This specification provides the basic acceptance requirements for steel fiber that will be used as a reinforcement in concrete. The two principle types of steel fiber that are used in concrete are identified as Type I and Type II steel fibers. The single distinguishing property that defines the difference is the base material used in the manufacturing process. Type I steel fiber is a cold-drawn wire and Type II is a slit sheet. The Type I steel fiber will have either a circular or semicircular cross-section. The Type II steel fiber will have a rectangular cross-section.

All of the physical property requirements found in ASTM A820 for the two fiber types, which include tensile strength, bending (an indication of ductility) and dimensional conformity, are the same.