A concrete slab should be bull floated as soon as possible after which operation?

A concrete slab should be bull floated as soon as possible after which operation?

• A. Placing
• B. Edging
• C. Floating
• D. Screeding

Answer: (D)

Bull floating is timed to follow screeding. Screeding establishes the final grade and knocks down high spots, leaving a surface that’s still plastic enough to work with. If you bull float right after screeding, you consolidate the surface, push the aggregate down, and bring the cream (finely mixed cement paste) to the top to produce a smooth, uniform finish. Waiting too long lets the surface stiffen or laitance form, making the bull float less effective and risking a rougher ride for the finish. After this step, you’d proceed with edging and other finishing operations.

Bull floating is timed to follow screeding. Screeding establishes the final grade and knocks down high spots, leaving a surface that’s still plastic enough to work with. If you bull float right after screeding, you consolidate the surface, push the aggregate down, and bring the cream (finely mixed cement paste) to the top to produce a smooth, uniform finish. Waiting too long lets the surface stiffen or laitance form, making the bull float less effective and risking a rougher ride for the finish. After this step, you’d proceed with edging and other finishing operations.