Which of the following is CORRECT for the workability of the concrete having the compaction factor of 0.92?
Correct Answer: C. Medium
📚 Detailed Explanation: CF 0.92 = Medium Workability
Why C (Medium) is correct: Per IS 456 classification, CF = 0.85–0.92 corresponds to medium workability. CF = 0.92 is at the upper boundary of medium. High workability begins at CF > 0.92. Note: some references treat 0.92 exactly as the transition point — in exam context, CF = 0.92 = medium (not yet high). CF > 0.92 (e.g., 0.95) = high.
IS Compaction Factor Classification
| Compaction Factor | Workability | Equiv. Slump |
|---|---|---|
| <0.75 | Very low | 0–25 mm |
| 0.75–0.85 | Low | 25–75 mm |
| 0.85–0.92 (CF=0.92) | Medium | 50–100 mm |
| >0.92 | High | 100–150 mm |
- CF 0.92 = upper boundary of medium workability.
- CF 0.95 = high workability (Q47 and Q66).