Rebar (short for reinforcing bar), known when massed as reinforcing steel or reinforcement steel, is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension. Concrete is strong under compression, but has weak tensile strength. Rebar significantly increases the tensile strength of the structure. Rebar’s surface is often “deformed” with ribs, lugs or indentations to promote a better bond with the concrete and reduce the risk of slippage. The most common type of rebar is carbon steel, typically consisting of hot-rolled round bars with deformation patterns.

Rebars are classified based on a certain amount of their tensile strength, which is called the characteristic strength of the rebar. Rebars produced (according to the Russian standard) are divided into three general groups: type A-1 rebar, type A-2 rebar and type A-3 rebar. In the construction workshop, in terms of mechanical category or appearance, they are generally divided into four categories: A1, A2, A3 and A4. Rebars are A1 (soft without tread), rebar A2 (semi-hard with simple tread) and rebar A3 (hard with tread).

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