Quantity of cement
Quantity of mortar = Quantity of brickwork – Volume of Bricks
Volume of bricks =0.070 CFT x 500 No’s = 35 CFT
Quantity of mortar = 45 – 35
= 10 CFT
Mix Ratio –> 1:5
Dry volume of mortar = Wet volume x (1+0.33) (33% of volume)
Dry Volume of mortar= 10 x 1.33 = 13.3 CFT
Consider 5% wastage of mortar.
Dry volume of mortar = 13.3 + (13.3 x 0.05) = 13.3+0.665 = 13.965 ≊ 14 CFT
Quantity of Cement = {(Dry Volume of mortar x Cement ratio) / (Sum of the ratio)}
∴Quantity of cement = (14 x 1) /(1+5)=2.333 CFT
Density of Cement = 1440 kg/m³
1 m³=35.3147 Cubic Feet (CFT)
∴ Quantity of Cement = 2.333/35.3147 = 0.066 m³
∴ Weight of Cement = 1440 x 0.066 = 95.04 Kg
1 bag of cement contains 50 kg of cement
∴ Number of bags = 95.04 Kg / 50 kg = 1.90 No’s (Say 2 No of bags)
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