Before doing any type of brick work quantity should be known.here are some basic steps for taking out brick work quantity in details.After knowing the 1 meter cube volume we can calculate the remaining quantity very easily by just multiplying 1 meter cube result of the desired volume.
Before start of calculation some basic data should be known:
1) The width of the wall which are going to built
2) Number of openings in wall like ( Doors , windows)
3) Size of brick or which type of bricks are going to use
Let's take an Example o understand well
Example :-
Let's assume we have to construct the wall having a length 1m, width 1m and height 1m. the size of brick is going to use is 190mm x 90mm and mortar thickeness is 10mm with mortar ratio 1:4 so :
 |
| 1 Cum |
1) Calculate the number of bricks
2) Quantity of Cement
3) Quantity of sand
This calculation can take in to two steps:
1) Brick calculation
2) Mortar Calculation
As we have volume of brick is = ( 1 x 1 x 1 ) = 1 cube
Step - 1
Volume of 1 brick = 0.19m x 0.09m x 0.09m = 0.001539 meter cube
volume of 1 brick with mortar = 0.2m x 0.1m x 0.01m = 0.002 meter cube
Numbers of bricks in 1 cum = Total volume / volume of bricks with mortar
= ( 1/0.002) = 500 nos of bricks
Step -2 Mortar calculation
Volume covered by 500 bricks in 1 cum
= ( Bricks number x volume of 1 brick )
= 500 x 0.001539
= 0.769 cube meter
Mortar Volume
= ( 1 - 0.769 )
= 0.23 meter cube ( wet volume )
Dry Volume
= 0.23 x 1.33
= 0.3 meter cube ( Dry volume )
Note :- 1.33 is a constant
Cement
= ( Dry volume x ratio x density of cement ) / ( sum of ratio )
= ( 0.3 x 1 x 1440 ) / 5
= 86.4 kgs / 50
= 1.72 bags
Sand
= ( Dry volume x ratio x 35.28 ) / ( sum of ratio )
= ( 0.3 x 5 x 35.28 ) / 5
= 10.58 cubic ft.
Result
Brick = 500 nos
Cement = 1.72 bags
Sand = 10.58 cubic ft.
Note :- These ratio may change by changing the dimension of the mortar thickness or size of the bricks as well as the mortar ratio 1:4 , 1:6 etc.
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