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Question
The number of cement bags required in making plane cement concrete flooring in an area of size 3 m × 3 m and 100 mm thick using cement concrete of mix 1 : 3 : 6 is
A.
4 Bags
B.
8 Bags
C.
2 Bags
D.
6 Bags
Answer ( Option A)

4 Bags

Solution

Weight of 1 bag of cement = 50 kg
1m3 of dry cement = 1440 kg
Volume of floor = 3m × 3m × 0.1m = 0.9m3
Total wet quantity of concrete required = 0.9m3
Total dry quantity = 1.54 × wet quantity
                             = 1.54 × 0.9 = 1.386 m3

Quantity of one portion

                         
Total quantity of cement = 0.1386 × 1 = 0.1386 m3
Total weight of cement required  = 0.1386 × 1440 = 199.584 kg ≈ 200 Kg
So, number of cement bags required

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