How many methods of batching of concrete are there?
Try it first: pick an option, then read the explanation.
Correct answer: A. 2
Detailed Explanation: Two Methods of Batching Concrete
Why A (2 methods) is correct: The two fundamental methods of measuring/batching concrete ingredients are Volume Batching and Weigh Batching. These are the two primary categories recognised in IS 456 and standard civil engineering curricula.Method 1: Volume Batching
| Aspect | Detail |
|---|---|
| Tool used | Gauge boxes (farmas, measure boxes) |
| How materials measured | Fill gauge box level; number of boxes per batch |
| Accuracy | Lower (affected by bulking of sand, moisture, aggregate grading) |
| IS 456 permission | Permitted for concrete grades M15 and below |
| Correction needed | Bulking correction for moist sand |
Method 2: Weigh Batching
| Aspect | Detail |
|---|---|
| Tool used | Weigh batcher, platform scale, load cell, or overhead hopper scale |
| How materials measured | Weighed to exact target mass in kg |
| Accuracy | High (mass unaffected by bulking, moisture, or void content) |
| IS 456 requirement | Mandatory for concrete grade M20 and above |
| Water correction | Adjust for free moisture in aggregates (absorb from or add to mix water) |
- Two batching methods: Volume batching (gauge boxes) and Weigh batching (scales).
- Weigh batching is more accurate and mandatory for structural concrete (M20+) per IS 456.