Rebars, RC Bars, Deformed Bars, Reinforcing Bars
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Steel Rebars – RC Bars, Deformed Bars, and Reinforcing Bars

A steel rebar (short for reinforcing bar), also known as reinforcing steel, reinforcement steel, or a deformed bar, is a common steel bar, and is commonly used as a tensioning device in reinforced concrete and reinforced masonry structures holding the concrete in compression. It is usually formed from carbon steel, and is given ridges for better mechanical anchoring into the concrete

The surface of the steel rebar may be patterned to form a better bond with the concrete.

Concrete is a material that is very strong in compression, but relatively weak in tension. To compensate for this imbalance in concrete’s behavior, rebar is cast into it to carry the tensile loads. Most steel reinforcement is divided into primary and secondary reinforcement, but there are other minor uses:

  • Primary reinforcement refers to the steel which is employed to guarantee the resistance needed by the structure as a whole to support the design loads.
  • Secondary reinforcement is employed for durability and aesthetic reasons., by providing enough localized resistance to limit cracking and resist stresses caused by effects such as temperature changes and shrinkage
  • Rebar is also employed to confer resistance to concentrated loads by providing enough localized resistance and stiffness for a load to spread through a wider area.
  • Rebar may also be used to hold other steel bars in the correct position to accommodate their loads.
  • External steel tie bars can constrain and reinforce masonry structures, as illustrated by the Nevyansk Tower or ancient structures in Rome and the Vatican.
Below table are the specifications and weight references for deformed bars:
Standard weight of deformed round steel bars
Bar Diameter mm Unit weight 6.0 m 7.5 m 9.0 m 10.5 m 12.0 m
10 0.616 3.896 4.620 5.544 6.466 7.392
12 0.688 5.328 6.660 7.992 9.324 10.656
16 1.578 9.468 11.835 14.202 16.588 18.936
20 2.466 14.796 18.495 22.194 25.893 29.592
25 3.853 23.118 28.895 34.677 40.457 46.236
28 4.834 29.004 36.255 43.506 50.757 58.008
32 6.313 37.878 47.349 56.517 66.287 75.758
35 7.990 47.940 59.925 71.910 83.896 95.880
40 9.865 59.190 73.988 88.785 103.683 118.380

* Maximum yield strength of Weldable steel bars shall not exceed 540 MPa
** Tensile strength shall not be less than 1.25 time the actual yield strength

Standard weight of deformed round steel bars
Bar Diameter mm Unit weight 6.0 m 7.5 m 9.0 m 10.5 m 12.0 m
10 0.616 3.896 4.620 5.544 6.466 7.392
12 0.688 5.328 6.660 7.992 9.324 10.656
16 1.578 9.468 11.835 14.202 16.588 18.936
20 2.466 14.796 18.495 22.194 25.893 29.592
25 3.853 23.118 28.895 34.677 40.457 46.236
28 4.834 29.004 36.255 43.506 50.757 58.008
32 6.313 37.878 47.349 56.517 66.287 75.758
35 7.990 47.940 59.925 71.910 83.896 95.880
40 9.865 59.190 73.988 88.785 103.683 118.380

* Maximum yield strength of Weldable steel bars shall not exceed 540 MPa
** Tensile strength shall not be less than 1.25 time the actual yield strength

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