# 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 :

1. Cement : 7.87 Bags/ CuM
2. Sand : 0.41 CuM.
3. 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 = 8.25 M.

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

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

## 2 thoughts on “How much material is needed per pile ?”

1. Santosh Kulkarni says:

Its a brilliant observation and I congratulate you for this.
True .That I have not considered the anchor length in the 8350 – ( 50+50 ).
The reason is that as you can see in the second photograph,
we have dismantled top 1000 mm of the concrete.
Thus we are already getting an extra length of 1000 mm .
As we shall need anchoring of 60D ( 60*16 = 960 mm ).

But its a great question .
Hope this clarifies my position.
In case of further query , I would love to clarify.

Regards

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