Hand spreading relies on a tool that provides control and a way to distribute concrete evenly across the forms. Short-handled, square-ended shovels are ideal because the short handle keeps you close to the material, giving precise control for pushing and pulling the mix and for working along the edges. The square-ended blade is great for striking off excess and leveling at corners and along the forms, which helps create a uniform slab thickness from edge to edge. This setup is purpose-built for moving bulk concrete into place, unlike long-handed trowels (meant for finishing), drills (for mixing or drilling), or hammers (for breaking or driving), which aren’t used to spread concrete.

Timing is key for bull floating. The goal is to smooth and consolidate the surface while beginning to embed the aggregate and close small surface voids. Do this when the surface has started to stiffen and the bleed water is receding but hasn’t completely disappeared. A little bleed water on the surface can actually help by lubricating the float and carrying away fines, which aids in forming a uniform, laitance-free surface. Waiting until all bleed water has evaporated makes the surface drier and harder to work, often leading to a rougher finish or surface dusting. So, bull floating after all bleed water has evaporated is not required and is not the best practice.

Bleed water on a freshly placed slab sits on top of a thin layer of cement paste that has risen with the water. The goal when removing that water with a heavy hose or a squeegee is to lift only the free water, not the cement paste that’s floating on the surface. If you drag across the surface when paste is present, you’ll pull that paste away, leaving a weak, chalky laitance or a rough finish and potentially exposing the underlying, less-set concrete. Keeping the surface paste-restricted preserves the surface integrity and allows proper finishing afterward. The other options don’t fit because air isn’t a material to be removed in this context, and sludge or cement already form part of the paste mix rather than clean water that should be wiped away. The emphasis is on not removing the cement paste with the bleed-water removal process.

Finishability refers to the period after placement when finishing operations can be performed before the concrete stiffens beyond workable consistency. Slower setting slows the hydration process, so the concrete stays plastic longer. That keeps it workable for more time, allowing you to finish it properly without rushing. So the finishing window is extended, making the statement true. (Keep in mind that too-slow setting can bring other issues like bleeding or surface dusting, but the basic effect on finishability timing is an extended window.)