Rebar, short for "reinforcing bar," is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and masonry structures. It helps to improve the tensile strength of the concrete, which is strong in compression but weak in tension. Rebar provides additional support and stability, helping to prevent cracking and failure in structural components. Rebar comes in various sizes and grades, typically identified by a numeral system that denotes its diameter and tensile strength.
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