Some Constant Values to be Considered before Estimating concrete quantity
Density of Cement – 1440 kg/m3
Density of Sand – 1450-1500 kg/m3
Density of Aggregate – 1450-1550 kg/m3
How many kg’s in 1 bag of cement – 50kg
Each bag of cement in cubic meters – 0.0347 cubic meter
Number of bags of in 1 cubic meter cement – 28.8 bags
How to calculate concrete materials quantity
Concrete consists of four main ingredients/materials as cement, sand ,aggregate and water.
For volumetric calculation, let’s consider length, width and height.
Assuming we need 5 m3 of concrete for M20(1:1.5:3) concrete mix.
Sum of concrete parts = 1 + 1.5 + 3= 5.5 parts
Now let’s find individual materials quantities,
Cement Quantity – (Cement parts / Sum of Concrete parts) x Concrete Volume
-(1/5.5) x 5 = 0.9090m3
Density of Cement = 1440 kg/ m3 = 0.9090 X 1440 = 1,308.96 kg = 26.17~27 bags.
Sand Quantity -(Sand parts / Sum of Concrete parts) x Concrete Volume
-(1.5/5.5) x 5 =1.3636m3
Coarse Aggregate Quantity-(Coarse Aggregate parts / Sum of Concrete parts) x Concrete Volume
-(3/5.5) x 5 =2.7272m3
Water Quantity – W/C Ratio x Cement Volume
Note – 0.45 is an assumed water cement ratio according to IS 10262 (2009)
– 0.45 x 0.9090 m3 = 0.40905 m3
Unit weights of water – 1000 liters/m3
– 0.40905 x 1000 = 409.05 liters
Therefore, For 5m3 of concrete we need 27 bags of cement, 1.3636m3 of sand, 2.7272m3 of coarse aggregate and 409.05 liters of water.
Also Read- Types of Concrete Mixers Machine