In civil engineering Some important note about Reinforcement casting

Why cover blocks used in Reinforcement:-

To maintained specified distance between Rebars & shuttering.
To protect Reinforcement from corrosion.
To provide Thermal insulation.

Lapping in Tension :-

L = 50D to 60D (D= diameter of bars)

Lapping in compression :-

L = 24D

No. Of stirrups calculation :-

{ Clear span/center to center spacing}+1

Minimum Hook length of stirrups :- 9D(90mm)
Deflection means :- Temporary displacement
Deformation means :- permanent displacement
Stirrups hook angle should be 135°
MS bar larger than 36mm diameter should not be lapped. if it's than welding is referred.
No lapping should be placed in tension zone.
The longitudinal bar should be bent at 90° & bent length should not be less than 18"or 1.5 feet.
End hook angle of longitudinal bars of columns & beam should be 90°
More than 50% of bar should not be lapped in one zone.
The length of hook should not be less than 12d. Where "d" is diameter of bar.
Young modulus of steel (Es) = 2*10^5 N/ mm
Strength of Reinforcement should not be less than 15% of its designated strength.

Reinforcement ( RCC) work knowledge

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