The preparation of a slab for Exposed Aggregate Concrete uses the same process as described in our stamped concrete section, so please read that section for details about prep. To achieve the exposed aggregate look after the final set of a slab, we wash off the surface to expose the aggregate. The preferred method is always for use to clean aggregate is washing, however sometimes it’s not practical or an option, so we may opt to sandblast the surface to expose the rock, most often sandblast exposed steps. The process is a messy one, so any flowers adjacent to the work area should be transplanted until the new driveway is installed. If a new build, it’s always best to have the exposed work complete before final exterior finishing, such as a light stucco finish coat.