In case of volume batching followed for the manufacture of cement concrete, generally, the volume of the bag of cement is considered as ______
Try it first: pick an option, then read the explanation.
Correct answer: D. 35 litres
Detailed Explanation: Volume of a 50 kg Cement Bag
Why D (35 litres) is correct: In volume batching, all materials are measured by volume. The cement is the reference unit. One standard bag = 50 kg OPC. Using the loose bulk density of cement:Volume = Mass / Bulk Density = 50 kg / 1440 kg/m³ = 0.0347 m³ ≈ 35 litres
This 35-litre reference is standardised in Indian practice for volume batching calculations. Loose bulk density of OPC ≈ 1440 kg/m³
Volume of 1 bag = 50 ÷ 1440 = 0.0347 m³ = 34.7 L ≈ 35 litres
Importance of 35-Litre Reference
| Mix Ratio | Sand per bag (vol) | CA per bag (vol) |
|---|---|---|
| 1:1:2 | 35 × 1 = 35 L | 35 × 2 = 70 L |
| 1:1.5:3 | 35 × 1.5 = 52.5 L | 35 × 3 = 105 L |
| 1:2:4 | 35 × 2 = 70 L | 35 × 4 = 140 L |
| 1:3:6 | 35 × 3 = 105 L | 35 × 6 = 210 L |
- 1 bag of cement = 50 kg = 35 litres by volume (standard for volume batching in India).
- In weight batching this is not relevant — materials are weighed directly.