Troweling produces a hard, smooth, dense surface and should be done immediately after floating.
Troweling can be done by machine or by hand .If done by hand, the finisher will float and trowel and area before moving his knee-boards.
A fresno is a steel trowel attached to a bull-float handle. Putting a long handle on the trowel allows finishers to trowel the concrete without walking out onto the slab. Fresno trowels do not, however, produce the same density or wear resistance that is produced by multiple hand trowelings where the finisher can apply greater pressure to densify the concrete.
More than one troweling can be done: as the concrete sets each successive troweling should be made with a smaller trowel tipped at a greater angle than the last troweling. This increases pressure on the surface producing maximum floor smoothness and hardness. However, hard troweled surfaces are not suggested for outdoor surfaces since they become slippery when wet.
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