Which finishing technique is primarily used to enhance surface grip on concrete?

C. Broom finishing is a technique specifically employed to enhance surface grip on concrete. This method involves using a broom after the surface of the concrete has set to create a texture that increases friction. The bristles of the broom create small ridges and grooves on the surface, making it less slippery and improving safety in areas where foot traffic is expected, such as sidewalks, driveways, and patios. The textured surface obtained from broom finishing is not only practical for safety but also provides a visually appealing and durable finish.

In contrast, polishing and smoothing techniques focus on creating a flat and shiny surface without textures, which can actually reduce grip. Stamping involves imprinting patterns into the concrete for aesthetic purposes rather than functionality concerning slip resistance. Therefore, broom finishing stands out as the best choice for enhancing surface grip on concrete.