PROCEDURE TO CALCULATE CEMENT BAGS IN 1 CUBIC METER:
Let us consider the nominal mix is 1:2:4
Wastage of cement during handling is considered as 2%
Output of mix is considered as 67%
To achieve 1 cum output, we need drymix 1/0.67 = 1.49 say 1.50 cum.
Now add the wastage of 2%, i.e (1.50 + 0.02) = 1.52 cum.
Volume of cement = (cement/cement+sand+aggregate) × Total material
=(1/1+1+4) × 1.52
=0.2171 cum
Now, Density of cement is 1440 kg/cum
Weight of 1 bag cement = 50 kg.
Therefore volume of 1 bag cement = 50/1440
=0.0347 cum.
∴ No. of cement bags required in 1 cubic meter= 0.2171/0.0347
= 6.25 bags.
Note: Same formula can be used for calculating cement for other nominal mixes also.
easy to understand
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