Rebar Rebar, short for reinforcing bar, is steel reinforcement embedded within concrete to improve its ability to resist tension and control cracking. Concrete provides compressive strength, while rebar helps carry tensile forces.
Reinforcing steel is commonly placed according to engineered designs before concrete is poured. The bars become bonded to the hardened concrete, allowing both materials to work together under load. Rebar is widely used in structural concrete and selected pavement applications where additional reinforcement is required.
Frequently Asked Questions About Rebar
What is rebar?
Reinforcing bar, steel embedded within concrete to resist tension and control cracking, since concrete is strong in compression but weak in tension.
Do sidewalks need rebar?
Standard pedestrian sidewalk flags usually do not. Rebar is used where engineered designs call for it, such as driveway aprons, sidewalks over vaults and structural slabs.
How does rebar work with concrete?
The bars bond to the hardened concrete so the two materials act together, with steel carrying tensile forces the concrete cannot.
Does placement matter?
Yes. Bars must sit at the designed depth with adequate concrete cover, or the steel can corrode and the reinforcement will not perform as intended.