How to calculate Quantity of Cement, Sand, Aggregate & Water in M20 concrete?

\In order to calculate the required quantity of Cement, Sand, Coarse Aggregates and water for M20 grade of concrete we have to follow 6 simple steps.

1. Assumptions

Volume of concrete = 1 m³

Grade of concrete M20  (1:1.5:3)

2. Find-out the Quantity of concrete (Wet volume & Dry volume)

Wet volume of concrete = 1 m³

Here, wet volume is nothing but Volume of the concrete after mixing with water.

∵ Dry volume = Wet volume x 1.54 (You can also take it as 1.50 to 1.55, But it became standard practice to considering 1.54 as multiplication factor).

what is 1.54 in concrete?

Dry volume of concrete = 1 x 1.54 =1.54 m³

3. Find-out quantity of Cement

∵ Quantity of cement = (Dry volume of concrete x cement ratio)/(sum of the ratio)

Cement = (1.54 x 1)/(1+1.5+3)=0.28 m³

∵ Density of Cement = 1440 kg/m³

Weight of Cement = 1440 x 0.28 = 403.2 Kg

∵ 1 bag of cement contains 50 kg of cement

Number of bags = 403.2 Kg/50 kg = 8.064 ≅ 8 No’s

4. Find-out quantity of Sand

∵ Cement : Sand :: 1:1.5

Quantity of sand =Quantity of cement x 1.5

∴ Quantity of Sand = 0.28 x 1.5 = 0.42

∵ 1m³=35.3147 Cubic Feet (CFT)

Quantity of sand = 0.42 x 35.3147 = 14.832 CFT

∵ Weight of sand = volume x density, Density of Sand = 1600 kg/m^3 

∴ Weight of sand= 0.42 x 1600=  672 kg (0.672 tonnes)



5. Find-out quantity of Coarse Aggregates

∵ Cement : Coarse Aggregates :: 1:3

Quantity of Coarse Aggregates =Quantity of cement x 3

∴ Quantity of Coarse Aggregates = 0.28 x 3 = 0.84 

∵ 1m³=35.3147 Cubic Feet (CFT)

Quantity of Coarse Aggregates = 0.84 x 35.3147 = 29.664 CFT

∵ Weight of sand = volume x density, Density of Coarse Aggregates = 1520 kg/m^3 

∴ Weight of Coarse Aggregates = 0.84 x 1520 =  1276.8 kg (1.28 tonnes)

6.Find-out quantity of water

Assume water cement ratio as 0.50

Quantity of water =  403.2 x 0.50 = 201.6 Liters

Watch the video in the below link for better understanding and detailed explanation.

How to calculate Quantity of Cement, Sand, Aggregate & Water in M20 concrete?

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