15 Technical Terms about Reinforcement
Very important and must know a construction supervisor
15 Technical Terms about Reinforcement are following:
1. Concrete Cover for Reinforcement:

Pile – 3″ or 75 mm

Pile cap – 3″ or 75 mm

Footing – 3″ or 75 mm

Column below ground – 2½” or 65 mm

Column above ground – 1½” or 40 mm

Shear wall below ground – 2½” or 65 mm

Shear wall above ground – 1½” or 40 mm

Beam below ground – 2½” or 65 mm

Beam above ground – 1½” or 40 mm

Slab below ground – 2″ or 50 mm

Slab above ground – ¾” or 20 mm Stair – ¾” or 20 mm

Retaining wall’s earth face – 1½” or 40 mm and opposite face: 1″ or 25 mm

Doorwindow lintel – ¾” or 20 mm Sunshade – ¾” (20 mm).
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2. Hook’s Length of Stirrup:
The formula for calculating stirrup’s hook length is ‘6db”. Where “db” is the diameter of bar. But stirrup’s hook length should not be less than 3″.
3. End Hook for Longitudinal Bar of Beam:
End hook is provided at both end of longitudinal bar. The length of hook should not be less than 12db. Where db is the diameter of bar.
4. End Hook of Slab Top Reinforcement:
End hook length of slab’s top bar shouldn’t be less than 12db. Where db is the diameter of bar.
5. Bend for Vertical Bar of Column:
Vertical bar of column is also called longitudinal bar. Bend is provided at one end of longitudinal bar. The bend is 90° and length of bend should not less than 18″ (450 mm).
6. Anchorage Length of Cantilever Member:
The anchorage length of main bar of a cantilever rcc member should not be less than 69db. Where db is the diameter of bar.
7. Hook’s Angle of Stirrup:
Stirrup’s hook angle is 135°.
8 . End Hook’s Angle of Longitudinal Bar:
End hook angle of longitudinal bars of column and beam is 90°.
9. No Lap Bar:
MS bar larger than 36 mm diameter shouldn’t be lapped.
10. Maximum Lap in a Zone:
More than 50% of bars shouldn’t be lapped in one zone.
11. Lap in Tension:
No lapping should be placed in tension zone.
12. Placing 1st Stirrup:
1st stirrup of beam should be placed within 2″ from the support.
13. Minimum Longitudinal Bar in a Column:
A squareshape column should have minimum 4 numbers of bars and a round column should have minimum 6 numbers of bar.
14. Chair:
MS bar for chair shouldn’t be less than 12 mm diameter.
15. Unit Weight of MS Bar:
8 mm ø bar – 0.12 kg/ft
10 mm ø bar – 0.19 kg/ft
12 mm ø bar – 0.27 kg/ft
16 mm ø bar – 0.48 kg/ft
20 mm ø bar – 0.75 kg/ft
25 mm ø bar – 1.25 kg/ft
So, these are the most important Technical Terms about Reinforcement
I hope useful for all of you.
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15 technical terms of rienforcement
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