The volume of mortar in a brick wall can be calculated as follow :-
Volume of brick wall = total volume of all bricks + volume of mortar
So, volume of mortar = Volume of brick wall – total volume of all bricks except mortar
The calculation is done in the following ways :
Total volume of bricks with mortar is taken as 10 cubic meter
The thickness of mortar is considered as 10 mm
The proportion of cement and sand = 1:6
The size of each brick = 190 mm x 90 mm x 90 mm
The size of brick with mortar = 200 mm x 100 mm x 100 mm (after adding 10 mm mortar thickness)
Volume of each brick along with mortar = Length x Breadth x Height = 0.2 x 0.1 x 0.1 = 0.002 cum (here, each is divided with 1000)
So, total numbers of bricks in 10 cum = 10 / 0.002 = 5000
The volume of each brick except mortar = 0.19 x 0.09 x 0.09 = 0.001539 cum
The volume required for 5000 numbers of bricks = 0.001539 x 5000 = 7.695 cum
So, volume of mortar = Volume of total brick work with mortar – Volume of total bricks = 10 – 7.695 = 2.305 cum (wet volume)
Because of frog filling, brick joint filling as well as wastage, the quantity is raised by 15%.
So, the volume of wet mortar = 2.305 + (15% of 2.305) = 2.651 cum or cubic meter.
To covert wet mortar to dry mortar add 33% as follow :-
Volume of dry mortar = 2.651 + (33% of 2.651) = 3.526 cum
The quantities of cement, sand and water will be calculated as follow :-
Cement = Volume of dry mortar x ratio of cement / sum of ratio x density of cement = 3.526 x 1/7 x 1440 = 725.348 = 14.51 bags (sum of ratio = 1+6 = 7)
Sand = Volume of dry mortar x ratio of sand / sum of ratio x 35.3147 (1 cum = 35.3147 cft) = 3.526 x 6/7 x 35.3147 = 107 cft or cubic feet
Suppose, the ratio of water and cement = 0.45
So, water / cement = 0.45
Water = 0.45 x cement = 0.45 x 725.348 = 326 litres.
Published By
Arka Roy
www.constructioncost.co
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