The Material estimation for an Elevated RCC (Reinforced concrete) Tank

Here we will calculate the cement, sand, crushed stone and of course steel for a conventional water tank. After that, the reader will be able to know the estimation of the material of any circular RCC (reinforced concrete) water tank. 

 

 

The Material estimation for an Elevated RCC (Reinforced concrete) Tank

 

 

There are two diameters: 

External diameter of the water tank =

            D = 4.40 meters

Internal diameter of the water tank =

            D1 = 4 meters

Water tank depth

                  = 4 meters

Reinforced concrete in base foundation

           = 40 cm = 0.40 meters

Water tank slab thickness

             = 10 cm = 0.10 meters

Tank wall thickness

               = 20 cm = 0.2 meter

Compressive strength:

             M15 or 150 kg/cm2 (1: 2: 4)

Use of steel 2% of reinforced concrete (Concrete volume)

Solution

External diameter of the tank (total diameter)

  = D = 4 + 0.2 + 0.2 = 4.4 meters

The internal diameter of the tank

            = D2 = 4 meters,

 

This diameter of the tank is without the wall thickness.

 

The Material estimation for an Elevated RCC (Reinforced concrete) Tank

Elevated tank water volume (wall) = V

      = Reinforced concrete working area x Tank depth

Volume = π /4(D² – D1²) x 4

Volume = π /4 (4.4^² – 4^²) x 4

Volume of reinforced concrete = 10.56 m3

Water Tank Volume Slab

      = Slab Area x Slab Thickness

  Volume = π D² / 4 x 0.10

        = π /4 x (4.4 ^2) x 0.10

Volume = 1.52 m3

 Foundation volume

    = Foundation area x Foundation depth

Volume = π /4 x D² x 0.40

Volume = 3.142 (4.4 x 4.4) 0.40

Volume = 6.10 m3

Total volume of reinforced concrete work

= volume of water tank wall + volume of water tank slab + volume of foundation

Total volume of reinforced concrete for water tank

= 10.56 + 1.52 + 6.1

 

 = 18.18 m3

 

The Material estimation for an Elevated RCC (Reinforced concrete) Tank

Now the calculation for other materials

Dry volume of concrete

    = wet volume x 1.54

    = 18.18 x 1.54 = 28 m3

Amount of cement

= proportion of cement / Sum of Proportion x dry volume of Concrete

Amount of cement

  = 1/7 x dry volume = 1/7 x 28

 = 4 m3

Convert to bags of cement

 = Total volume of cement / volume of bag of cement

No. of bags of cement = 4 / 0.0347

= 115.44

Let’s say 120 No. of bags

Quantity of Sand = proportion of Sand / Sum of Proportion x dry volume of Concrete

Sand quantity = 2 / 7 x dry volume

= 2 / 7 x 8

 = 8 m3

Aggregate Quantity

= Aggregate Proportion / Sum of Proportion x Dry Volume of Concrete

Aggregate Quantity = 4 / 7 x 28

 = 16 m3

Volume of steel for water tank

   = 2% of the volume of reinforced concrete

   Steel volume = 2/100 x 18.18

    = 0.3636 m3

For Quantity of steel, we know that Density of steel = 7850 kg/m3

Weight of steel

  = Density of steel x Volume of steel

Steel weight

= 7850 kg/m3 x 0.3636 m3

= 2854.26 kg

Let’s say 2900 kg of steel is required for the upper water tank.

Note: We can also use the same formula to find out the amount of same above materials for the rectangular water tank, but there is only shape difference, and, therefore, to find the amount of the materials just use the same formulas that have used in the water tank in above artic