Terms of the Trade: What Is Rebar? Terms of the Trade: What Is Rebar?
Short for reinforcing bar, rebar is used as a tension device to strengthen concrete or masonry structures. The pattern you see on the steel bar itself is meant to create a superior bond with the concrete, which, while strong in compression, is a weak material when it comes to tension over the long run. Fun fact: rebar has been used in construction since at least the 1400s.