For a metric calculation, a slab 150 mm thick, 60 m long, and 30 m wide with a 10% waste factor requires approximately how many cubic meters?

For a metric calculation, a slab 150 mm thick, 60 m long, and 30 m wide with a 10% waste factor requires approximately how many cubic meters?

• A. 270
• B. 297
• C. 300
• D. 310

Answer: (B)

When estimating concrete quantity, first find the concrete volume by thickness times the area of the slab. The thickness is 150 mm, which is 0.15 m. The slab area is 60 m by 30 m, giving 60 × 30 = 1800 m^2. Multiply by thickness: 0.15 × 1800 = 270 m^3. That’s the base volume without waste. Now add the waste factor to account for spillage, over-excavation, and other losses. 10% of 270 m^3 is 27 m^3. Add this to the base volume: 270 + 27 = 297 m^3. So, approximately 297 cubic meters of concrete are needed.

When estimating concrete quantity, first find the concrete volume by thickness times the area of the slab. The thickness is 150 mm, which is 0.15 m. The slab area is 60 m by 30 m, giving 60 × 30 = 1800 m^2. Multiply by thickness: 0.15 × 1800 = 270 m^3. That’s the base volume without waste.

Now add the waste factor to account for spillage, over-excavation, and other losses. 10% of 270 m^3 is 27 m^3. Add this to the base volume: 270 + 27 = 297 m^3.

So, approximately 297 cubic meters of concrete are needed.