What tool should be used immediately after strikeoff to eliminate high and low spots and embed large aggregate particles?

• A. Bullfloat
• B. Trowel
• C. Roller
• D. Broom

Answer: (A)

After strikeoff, the surface is still plastic and ridged, with some high spots and exposed large aggregate. A bullfloat is the right tool at this moment because it glides across the surface to smooth and level it, push down the high spots, fill low areas, and embed larger aggregates into the cement matrix. This helps bring the fine cement paste to the surface and creates a uniform base for the final finish. Using a trowel right away would overwork the surface and can pull too much water or disturb the aggregate; the trowel is used after the bullfloat for a finer finish. A roller isn’t used for this finishing step on concrete, and a broom is typically applied later, after the surface has stiffened, to impart texture.