Question

The dry volume of concrete required for 100 m² of 2.5 cm thick 1 : 2 : 4 DPC is
1. 2.5 m³
2. 3.5 m³
3. 3.58 m³
4. 3.85 m³

Answer 1

Correct Answer - Option 4 : 3.85 m³

Concept:

Wet Qty. of concrete = Area × thickness

Dry vol. of concrete = 1.54 × Wet volume of concrete

No. of cement Bags = Cement Qty/0.035

Calculation:

Area = 100 sq.m

Floor thickness = 2.5 cm

Concrete grade = 1:2:4

Wet quantity of concrete = 100 × 0.025 = 2.5 m³

So, to produced 2.5 m³ of wet concrete, dry concrete required = 1.54 × 2.5 = 3.85 m³

Bulk density of cement = 1440 kg/m3

1 bag of cement = 50 kg

Cement bags required = Volume of cement ×  1440/50