A small steel or stainless tool with a curved lip that leaves a radius of about 1/8 in to 1/2 in, run along the inside of the forms after floating and again during troweling. The rounded, densified edge holds up when forms are stripped and when wheels or feet hit it later. Its cousin the groover cuts tooled control joints across the slab with a bit sized to about a quarter of the slab depth.
Grab the quarter-inch edger and run the apron again, those edges are already starting to stiffen.
Also heard as
- edging tool
Related terms
Control joint
A planned groove or sawcut that makes a slab crack in a straight line exactly where the crew wants it.
Floating
The finishing step that levels, compacts and opens the surface of a slab once the bleed water is gone.
Broom finish
A textured surface made by dragging a broom across fresh concrete, giving slip resistance outdoors.
Spalling
Chunks or flakes breaking away from a concrete surface or edge, often from corroding rebar beneath.