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It is a steel rod or wire used in reinforced concrete and concrete structures to reinforce concrete in tension. To improve the bonding of rebar to concrete, the rebar's surface is often ribbed.

Although the concrete is compact and firm, it is weak in tensions and the fittings will solve this problem. With the addition of rebar to concrete, tensile loads are tolerated and the overall strength increases.

The rebars are made of hot rolled steel. Most steel bars are produced from steel ingots, while the rest are from steel sheet edges or railroads. The rebar needs some sort of identifier that can be used to identify them in rolling mills.

The ASTM (American Society for Testing and Materials) has developed a standard identifier that all longitudinal sections must comply with:

  • The numbers represent the size of the rebar.
  • Types of steel symbols eg. W for welding steel (ASTM A-706) or A for axis (M 322 / ASTM 966), etc., indicate that the rebar is rolled up of new ingots.
  • Rebar identifying grades 60 or 75, or 420 or 520 are metric measures, indicate the yield strength.
  • Factory identification icon. Usually a letter or a simple symbol is used.

European size (common size in Iran)

The metric unit in the rebar represents the nominal diameter in millimeters. Although there are several European standards (eg BS 4449 in the UK), the size of the rebar in Europe is in accordance with Table 6 of EN 10080 standard. In Switzerland, some sizes do not follow the European standard.

Cross section area
(mm²)

Nominal Diameter
(mm)

Linear Density

(kg/m)

Metric Size

28.3

6

0.222

6,0

50.3

8

0.395

8,0

78.5

10

0.617

10,0

113

12

0.888

12,0

154

14

1.21

14,0

201

16

1.58

16,0

314

20

2.47

20,0

491

25

3.85

25,0

616

28

4.83

28,0

804

32

6.31

32,0

1257

40

9.86

40,0

1963

50

15.4

50,0

 

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