IMPORTANT NOTES ABOUT REINFORCEMENT STEEL
1. To find weight of Steel (formula) = D ² /162 (kg /m)
2. To find weight of Steel (formula) = D ² /533 (kg /ft.)
3. Unit Weight of Steel / Density of steel is = 7850 (kg/m3)
4. Unit Weight of Reinforced Concrete / Density of Reinforced Concrete is = 2500 (kg/m3)
5. F.O.S – Factor of Safety of Steel is = 1.15
6. RCC – means Reinforced Cement Concrete.
7. Usually 6mm, 8mm,10mm,12mm, 16mm, 20mm, 25mm, 32mm, 40mm dia size of reinforced steel bar used in construction.
8. 6mm & 8mm steel bars are called as plain bar.
9. Plain bar :- The steel bar is don’t have rip which is called as plain bar.
10. 12mm, 16mm, 20mm, 25mm, 32mm, 40mm bars are called as Rebar (or) Torsion bar (or) Deformed bar.
11. Torsion / Rebar (or) Deformed bar : – The steel bar having a rip which is called as torsion or rebar.
12. Standard length of one reinforced steel bar is 12m.
13. The steel reinforcement used in construction is of four types. They are hot rolled deformed bars, cold worked steel bars, mild steel plain bars, and pre-stressed steel bars.
14. Minimum no of bars used in Square or Rectangular column is = 4 bars.
15. Minimum no of bars used in Circular column is = 6 Bars.
16. Minimum Diameter used for Dowels bars is 12 mm
17. Maximum Diameter of bars used in slab = 1/8 x Thickness of Slab
18. The minimum lapping length should be 50 times the diameter of the bar.
19. If steel bar size is more than 36 mm lapping is not allowed.
20. Chair reinforcement or simply chair rods are small structural elements that are used to place the reinforcement bars in the correct position and maintains the correct space between the top and bottom reinforcements. Chair bars are used primarily on the slab and flooring
21. minimum of 12mm diameter to be used for Chairs.
22. Maximum Chairs Spacing = 1m
23. Longitudinal reinforcement should not less than 0.8 % and not be more than 6% of gross area of cross section
24. Minimum (%) percentage of steel in Column 0.8 %
25. Maximum (%) percentage of steel in Column 4.0 %
26. Minimum (%) percentage of steel in beam = 1.0 %
27. Maximum (%) percentage of steel in beam = 2.0 %
28. Minimum (%) percentage of steel in Slab = 0.7 %
29. Maximum (%) percentage of steel in Slab = 1.0 %
30. Structural steel can be reused property.
31. Steel is very good bonding material in Concrete.
