A colorful exposed aggregate surface is often chosen for patios, garden walks, perimeter walks around swimming pools, and driveways- or for any area where a decorative, rustic effect is desired. Immediately after the slab has been screeded and darbied, the selected aggregate should be scattered by hand and evenly distributed so that the entire surface is completely covered. After the aggregate is quite thoroughly embedded and as soon as the concrete will support the weight of a mason on kneeboards, the surface should be hand floated using a magnesium float or darby. This operation should be performed so thoroughly that all aggregate is entirely embedded just beneath the surface. The grout should completely surround and slightly cover all aggregate, leaving no holes or opening in the surface. A reliable retarder may be sprayed or brushed over the surface following floating. The dry shake method produces a colored concrete surface that may be used for showrooms, schools, churches, patios, decorative walks, driveways or any areas where a colored surface is desired. After the concrete has been screeded and darbied, and free water and excess moisture have evaporated from the surface, the surface should be floated, either by power or by a hand float. Immediately following floating, the dry shake material is shaken evenly by hand over the surface. The first application of the colored dry-shake should use about two-thirds of the total amount needed. In a few minutes this dry material will absorb some moisture from the plastic concrete and should be floated. Immediately following floating, the balance of the dry shake should be distributed evenly and floated again. The concrete surface may also be scored or tooled with a jointer in various decorative patterns. After the concrete has been screeded and darbied and excess moisture has left the surface, it should be scored in random geometric designs. This should be done while the concrete very plastic, allowing coarse aggregate to be pushed aside by the tool. The first jointing operation will leave burred edges. After the excess moisture has disappeared, the entire surface should be floating and rejointed. The surface then should be carefully troweled. Other decorative finishes can be obtained by making leaf impressions, applying circle, swirl, or way broom designs in the concrete, or by adding a keystone finish.