Rebar popping is a common issue in flatwork concrete, where the reinforcing steel (rebar) inside the concrete slab corrodes and expands, causing the concrete to crack. This can result in a half-circular or crescent-shaped crack, often accompanied by a rust stain. Rebar popping occurs when the concrete cover over the rebar is too thin, or the pad settles allowing moisture to penetrate and initiate corrosion. As the rebar expands, it puts pressure on the surrounding concrete, eventually causing it