The final operation of finishing concrete floors is known as:
Correct Answer: C. Troweling
📚 Detailed Explanation: Troweling — The Final Floor Finishing Operation
Why C (Troweling) is correct: Concrete floor finishing follows a defined three-step sequence. Troweling is always the last step — it produces the final hard, smooth, dense surface by working the steel trowel over the floated surface once surface bleed water has evaporated.
Concrete Floor Finishing Sequence
| Step | Operation | Tool | Purpose | Timing |
|---|---|---|---|---|
| 1 | Screeding | Straight-edge / Screed board | Strikes off excess concrete; sets surface level | Immediately after placement |
| 2 | Floating | Wood or bull float | Removes screed marks; embeds aggregate; closes surface | After initial set begins; surface firm but workable |
| 3 | Troweling (Final) | Steel trowel | Creates hard, dense, smooth surface; compresses cement paste | After floating; once bleed water evaporates |
Troweling in Detail
| Aspect | Detail |
|---|---|
| Tool | Flat steel trowel (hand trowel or power trowel for large areas) |
| Technique | Firm pressure in circular or figure-8 motion; multiple passes |
| Timing | Must be done before concrete becomes too hard to work; not too early (bleed water must evaporate first) |
| Result | Hard, dense, dust-free, smooth surface resistant to wear |
- Sequence: Screeding → Floating → Troweling (final).
- Never trowel while bleed water is still on the surface — it weakens the surface layer (laitance).
- Multiple troweling passes increase density and hardness of the surface.