Calculate how much cement is required for 1 meter cube concrete?

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This answer was edited.Concrete is made up of different materials such as cement, sand, and aggregates. There are different grades of concrete-like normal grade, standard grade of concrete, and high strength grade of concrete. M5 e.g. “M” represents for mix whereas “5” numerical value represents the overall characteristicRead more

Concrete is made up of different materials such as cement, sand, and aggregates. There are different grades of concrete-like normal grade, standard grade of concrete, and high strength grade of concrete.

M5 e.g. “M” represents for mix whereas “5” numerical value represents the overall characteristics compressive strength (N/mm2) of that particular mix at 28 days. The nominal mix ratio is prepared as per IS 456 code book.

Concrete gradeType of concreteMix ratioM5,M7.5,M10 , M15 ,M20

Nominal mix ratio

M25,M30,M35 , M40 ,M45

Standard grade

Design mix ratio

M50,M55,M60 , M65 ,M70

High strength grade

Let’s calculate how much cement, sand, and aggregate are required for 1m3 of M20 concrete.

We know that wet volume of concrete = 1m3, but we need dry volume of concrete. To calculate dry volume of concrete we have to multiply 1.54 to wet volume of concrete.

When we mix the dry materials together with water, the number of air voids present in the dry materials get evaporated and their volume is decreased by 54% after mixing. That’s a reason why dry volume of concrete is increased by 54% of wet concrete.

Step 1:Wet volume of concrete = 1m3Dry volume of concrete = 1*1.54 (cubic meter)

Step 2:For Grade M20CementSandAggregate3

Total mix proportion = 1+1.5+3=5.5

Part of CementPart of SandPart of Aggregate3/5.5

Step 3:let’s calculate how much quantity of cement is required for M20 concrete in cubic meter.(1/5.5)* 1.54 m3= 0.28m3.

So,

0.28 m3 cementis required for 1 cubic meter of M20 concrete.Lets calculate this in the terms of bag.

1m3 of cement =1440kg

So, 0.28m3 of cement =1440*.28=403 kg

As we know, Each bag contain 50 kg

So the number of bags required =403/50=approx 8

So the number of Cement bags required is 8

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