For batching 1:3:6 concrete mix by volume, which of the following are the ingredients required per bag of 50 kg cement?
Correct Answer: D. None of these
📚 Detailed Explanation: Ingredients per Bag for 1:3:6 Mix
Why D (None of these) is correct: One bag of cement = 50 kg = 35 litres (standard volume for volume batching). In a 1:3:6 mix, the volumes of sand and coarse aggregate are computed as multiples of cement volume.
Volume of 1 cement bag = 35 litres
Sand volume = 3 × 35 = 105 litres
Coarse aggregate volume = 6 × 35 = 210 litres
Checking Each Option
| Option | Sand | Coarse Aggregate | Correct? |
|---|---|---|---|
| A | 70 L | 120 L | No — both wrong |
| B | 70 kg (wrong unit) | 140 L | No — wrong unit and values |
| C | 105 L ✔ | 140 L ✘ | No — CA should be 210 L |
| D | None of the above correctly states both values | YES ✔ | |
- Correct values: Sand = 105 L, Coarse aggregate = 210 L per 50 kg bag for 1:3:6 mix.
- Option (C) gets sand right but halves the CA; hence “None of these” is the only valid answer.