Select the INCORRECT statement from the following with regard to weight batching of concrete.
Correct Answer: B. Gauge boxes are used to weigh the fine and coarse aggregates
📚 Detailed Explanation: Gauge Boxes Are for Volume Batching, NOT Weight Batching
Why B is INCORRECT (= the answer): Gauge boxes are rigid containers of known volume (calibrated to hold the correct volume of aggregate for one batch). They are the primary tool of volume batching. In weight batching, materials are measured by mass using:
• Weigh-scales (spring or lever type) for small sites
• Weigh-hoppers with load cells for medium sites
• Fully automated batching plants with electronic load cells for large sites
Gauge boxes have no role in weight batching.
• Weigh-scales (spring or lever type) for small sites
• Weigh-hoppers with load cells for medium sites
• Fully automated batching plants with electronic load cells for large sites
Gauge boxes have no role in weight batching.
Checking All Four Statements
| Statement | True/False | Reason |
|---|---|---|
| A. Weight batching → accuracy, flexibility, simplicity | True | Weighing is more accurate than volume measurement; unaffected by bulking |
| B. Gauge boxes used in weight batching | FALSE (answer) | Gauge boxes are for volume batching; weight batching uses scales |
| C. Large sites use weight-bucket weighing equipment | True | Weigh-hoppers and automated batching plants are standard on large sites |
| D. Weight batching is the correct method | True | IS 456 recommends weight batching for better accuracy |
- Gauge boxes = volume batching tool (measures volume of aggregate).
- Weigh-scales/hoppers = weight batching tool (measures mass of aggregate).
- IS 456 recommends weight batching as the preferred method for accuracy.