Question

Estimate the quantity of concrete required for a 175 mm thick RCC slab over a room of external dimension 4 m × 5 m (including 30 cm wall thickness). Consider 0.2 m projection of slab all around the room.
1. 5.875 m³
2. 3.452 m³
3. 4.158 m³
4. 7.656 m³

Answer 1

Correct Answer - Option 3 : 4.158 m³

Explanation:

Given;

The dimension of RCC slab = 4 m × 5 m

The thickness of slab = 175 mm

There is a 0.2 m projection of slab all around the room,

So the overall dimension of slab = (4 + 0.4) × (5 + 0.4) = 4.4 m × 5.4 m

The total quantity of concrete = 4.4 × 5.4 × 0.175 = 4.158 m³