Exposed aggregate | Chalkline

Exposed aggregate is a concrete surface finish achieved by washing or brushing away the top layer of cement paste shortly after pouring, revealing the natural stone aggregate embedded in the mix. The result is a textured, slip-resistant surface with visible stones of varying colour and size.

Also known as: washed aggregate, aggregate finish, exposed aggregate concrete.

Common on residential driveways, paths, and pool surrounds. The aggregate type (river pebble, crushed granite, quartz, basalt) can be specified to match the site palette. The finish is applied after floating and before full set, typically using a surface retarder spray and a light water wash or brush. Once cured, efflorescence can appear in the first months if curing was inadequate; it usually weathers out.

Some councils restrict exposed aggregate finishes on the road-reserve portion of a vehicle crossing (requiring plain concrete only for the layback). Confirm with the local council before specifying.

Category: Concrete / Finishes

Residential driveways: vehicle crossings, slab specs, and surface options

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