Concrete Finishing – Operation for removing humps and hollows to achieve level What is the name of the finishing operation in which the freshly placed concrete surface is struck off to remove humps and fill hollows, bringing it to the correct level and grade?

Introduction / Context:
Concrete finishing comprises several sequential operations. Immediately after placement and compaction, the surface is brought to level by a straightedge. Knowing the correct term for each operation ensures clear instructions and quality control on site.

Given Data / Assumptions:

• Freshly placed concrete in slabs, pavements, or toppings.
• Use of a straightedge, strike-off board, or vibrating screed.
• Goal: achieve specified level and profile before subsequent finishing.

Concept / Approach:
Screeding (or strike-off) removes high spots and fills low areas to the form lines or guide rails, establishing level. Floating follows to embed aggregate and close minor voids; trowelling provides a dense, smooth finish where required. “Finishing” is a broad term encompassing all these steps; the specific name for the removal of humps and hollows to grade is screeding.

Step-by-Step Solution:
Identify the described action: strike-off to level → screeding.Distinguish from floating (subsequent) and trowelling (final smoothing).Select “Screeding”.

Verification / Alternative check:
Standard finishing sequences: screed → bull float → rest (bleed water) → steel trowel (as specified) → curing.

Why Other Options Are Wrong:

• Floating: aims at consolidating the paste at the surface after screeding.
• Trowelling: produces a smooth, dense finish; not primarily to remove humps/hollows.
• “Finishing” is generic, not the specific operation asked.

Common Pitfalls:
Overworking the surface while bleed water is present, which can cause dusting and scaling; allow proper timing between steps.

Final Answer:
Screeding