### Bags Of Cement In Concrete

Calculation of cement of bags in concrete is a routine task for civil engineers and technicians. Here is the method to calculate bags of cement, fine aggregates and coarse aggregates for all grades of concrete.

Say we have a concrete slab of  15’x15’x6″ thick made of 1:2:4 (M15) concrete.

Volume of the slab = 15x15x0.5 = 112.5 cft.

Using dry mix method:

Nominal Mix = 1:2:4

Wastage of cement is considered 2% during handling.
Concrete is prepared as wet mix which dries and shrinks in volume. This dried concrete in volume is considered as 67% of the wet concrete volume. Therefore, we need to produce a concrete which when shrinks is 112.5 cft.

112.5x/0.67 = 167.9 cft

1.02×167.9 = 171.258 say 171.25 cft.

Total proportions = 1+2+4 = 7

Amount of Cement = 1/7 x 171.25 = 24.46 cft

1 bag of cement = 50kg and has a volume of 1.23 cft

##### So Bags of cement = 24.46/1.23 = 19.88 = 20 bags

Volume of fine aggregates = 2/7 x 171.25 = 48.93 cft

Volume of coarse aggregates = 4/7 x 171.25 = 97.86 cft

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