How much material is needed per pile?

Background :

As a construction person , you should also be able to calculate the material required for the construction . Today , we shall learn how to calculate the materials required for the Pile foundations.



Data :

Pile Shape : Circular

Pile Diameter : 600 mm

Pile Depth : 8.35 M.

Mix of concrete : M20

Reinforcement: 6 HYSD bars of 16mm diameter .

Stirrups : 8 mm diameter bars provided at a spacing of 200 mm C/C [ Center to Center ]



As a construction person , we know the following :

1.Unit weight of 16mm dia HYSD bars : 1.58 Kg/m

2.Unit weight of 8mm dia HYSD bars : 0.39 Kg/m

3.Cover for Pile reinforcement : 50 mm

4.Material consumption for Concrete M20 :

Cement : 7.87 Bags/ CuM
Sand : 0.41 CuM.
Aggregate : 0.83 CuM.


4.Formula for volume of the cylinder = (0.785).D2.H
where D : Pile diameter in M & H : Pile height in M.



Having thus prepared , we shall now go for the actual calculations as follows .

Part A : REINFORCEMENT :

A.01 : Longitudinal bars :

Cutting Length of bar : 8350 –( 50+50 ) = 8250 mm = 8.25M.

Weight :

6 Nos X 8.25 m X 1.58 Kg/m = 78.21 Kg.

A.02 : Stirrups :

Stirrup diameter : 600 –( 50+50 ) = 500 mm.

Cutting length : ( 3.14) D +( 2x10d )

D : Stirrup Diameter =500 mm

d: Diameter of bar used for stirrup = 8 mm.

= (3.14 x 500 )+( 2x 10×8) = 1730 mm = 1.73 M.

No of stirrups : ( 8350 / 200 )+1 = 43 Nos

Weight : 43 Nos x 1.73M x 0.39 Kg/m = 29 Kg.



Summary of Reinforcement :

16mm dia HYSD bars : 78 Kg / Pile

8mm dia HYSD bars : 29 Kg / Pile



AUTHOR SHOWING THE PILE REINFORCEMENT [ NOT YET POSITIONED ] FOR FLYOVER AT PUNE.
AUTHOR SHOWING THE PILE REINFORCEMENT
[ NOT YET POSITIONED ] FOR FLYOVER AT PUNE.
Part B : M20 Concrete :
Volume of pile :

(0.785).D2.H

=0.785 x 0.6 x 0.6 x 8.35

=2.36 CuM /Pile



Cement required :

2.36 x 7.87 bags = 18.57 bags

Sand Required :

2.36x 0.41 CuM = 0.968 CuM.

Aggregate Required :

2.36x 0.83 CuM = 1.96 CuM.



Final Summary :

Material required per pile of 600 mm dia. having a length of 8.35 M.

Cement : 19 bags

Sand : 1 CuM

Aggregate : 2 CuM

Reinforcement bars :

16mm dia HYSD bars : 78 Kg

8mm dia HYSD bars : 29 Kg