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Rebars

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Rebars

Steel reinforcement bars or rebars are used to improve the tensile strength of the concrete, since concrete is very weak in tension, but is strong in compression. Steel is only used as rebar because elongation of steel due to high temperatures (thermal expansion coefficient) nearly equals to that of concrete.


Grades of Rebar in Different Codes

American Standard (ASTM A 615) Euro Standard (DIN 488) British Standard BS4449 : 1997 Indian Standard (IS 786)
Grade 75 (520) BST 500 S GR 460 A Grade Fe – 415, Fe – 500, Fe – 500D
Grade 80 (550) BST 500 M GR 460 B Grade Fe – 550

Types of Rebars

Major types of steel bars used in the construction are as follows :


Mild Steel Bars

The surface of the mild steel bars are plain and round in shape. They are available in various sizes of 6 mm to 50 mm. They are used in concrete for special purposes, such as dowels at expansion joints, where bars must slide in a metal or paper sleeve, for contraction joints in roads and runways, and for column spirals. They are easy to cut and bend without damage.


Grades in Mild Steel Bars


Mild Steel Bars

  • Mild steel bars grade-I designated as Fe 410-S or Grade 60.
  • Mild steel bars grade-II designated as Fe-410-o or Grade 40.

Medium Tensile Steel Bars designated as Fe- 540-w-ht or Grade 75.


Physical Requirement of Mild Steel Bars

Types of Nominal size of bar Ultimate Tensile Stress in N/mm2 Yield Stress N/mm2 Elongation Percentage min
Mild Steel Grade I or Grade 60
For Bars upto 20mm 410 250 23
For Bars above 20mm upto 50mm 410 240 23
Mild Steel Grade II or Grade 40
For Bars upto 20mm 370 225 23
For Bars above 20mm upto 50mm 370 215 23
Medium Tensile Steel Grade -75
For Bars upto 16mm 540 350 20
For Bars above 16mm upto 32mm 540 340 20
For Bars above 32mm upto 50mm 510 330 20

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