Structural

# Calculations for Footing Plain Cement Concrete

The dimensions of the PCC bed depend upon the size of the footing. As we have the given length of footing = 1.2m & width = 1.4m. The length and width of PCC will be determined by adding 100mm at either end of each dimension

## Calculations for Footing PCC

Length of PCC = Length of footing + 0.1m + 0.1m &

Width of PCC = Width of footing + 0.1m + 0.1m

Length of PCC = 1.2 + 0.1 + 0.1 = 1.4m

Width of PCC = 1.4 + 0.1 + 0.1 = 1.6m

The thickness of PCC will also be taken as 100mm i.e, 0.1m

Quantity of concrete:

Volume of concrete = Length x width x Depth = 1.4 x 1.6 x 0.1 = 0.224m³

It should be noted that this volume is the wet volume of the concrete. So we need to convert this  wet volume to dry volume by multiplying the wet

volume by a constant of 1.54.

Dry volume = wet volume x 1.54

Dry volume = 0.224 x 1.54 = 0.344m³

The volume of Cement:

Volume of Cement = (ratio of Cement/total ratio) x (Dry volume)

Volume of Cement = (1/7) x (0.344) = 0.049m³

Number of Cement bags required = volume of  Cement/volume of 1 bag of cement

[volume of 1bag = 0.035m³]

Number of Cement bags = 0.049/0.035 = 1.4 bags

### The volume of sand:

Volume of sand = (ratio of sand/total ratio) x  (dry volume)

= (2/7) (0.344) = 0.098m³

The volume of aggregate:

Volume of aggregate = (ratio of aggregate/total ratio)  x (dry volume) = (4/7) (0.344) = 0.19m³

### Shuttering Area

Shuttering Area = Peripheral Area of PCC = Area of 4 sides

= (Length x Depth) + (Width x Depth) + (Length x Depth) + (Width x Depth)

= 2(Length x Depth) + 2(Width x Depth) = 2Depth (Length + Width) = 2 x 0.1(1.4 + 1.6) = 0.6 m2

Bitumen paint Area

Bitumen paint Area = Peripheral area of PCC +  (Top area of PCC – Top/bottom area of footing)

= 0.6 + {(1.4 x 1.6) – (1.2 x 1.4)} = 1.16 m2

Polythene sheet

Polythene sheet = Length x width m2

= 1.4 x 1.6 = 2.24 m2

Termite Control

Termite area = Length x width m2

= 1.4 x 1.6 = 2.24 m2