8.9 : 混凝土精加工

After consolidating the placed concrete, excess material is removed from the surface and flushed with the formwork's top using a screed.

Subsequently, using a bull float or darby, the high spots on the concrete surface are lowered, low spots are filled, and large aggregates are embedded in the concrete before bleed water rises to the surface.

Once the sheen from the bleed water on the surface disappears upon evaporation, it is ready for final finishing. This begins with edging, which involves rounding off the concrete's edges.

It is followed by jointing, where control, isolation, and construction joints are strategically located in the structure.

Next, a handheld float or power float is used to remove any surface imperfections resulting from edging and jointing, embed the aggregates slightly within the concrete, and remove the excess water, keeping the surface open.

Lastly, the finished surface may be textured by troweling to create a hard and smooth surface, brooming to make it rough and slip-resistant, washing the excess cement paste on the top to create an exposed look, or patterned by inserting divider strips.