The slump test is performed to check the –
Correct Answer: D. Workability of concrete
📚 Detailed Explanation: Purpose of the Slump Test
Why D (Workability) is correct: The slump test is the most widely used field test for workability of fresh concrete. It is quick, inexpensive, and requires minimal equipment. Option A (presence of water in cement) is checked by the Vicat needle test. Option B (ratio of ingredients) is confirmed by mix design records and batch weighing. Option C (temperature resistance) is not tested on fresh concrete — it would require fired refractory tests.
Common Fresh Concrete Tests and Their Purpose
| Test | Purpose |
|---|---|
| Slump test | Workability (medium workability range) |
| Compaction factor test | Workability (low workability range) |
| Vee-Bee test | Workability (very low workability) |
| Flow table test | Workability (very high, SCC) |
| Vicat needle test | Setting time of cement paste |
- Slump test = workability test for medium-range mixes (25–150 mm slump).
- Best suited for site control of concrete batches; not suitable for very stiff or very fluid mixes.