Architectural concrete and method of forming the same

A method of forming architectural concrete, the method comprising the steps of:

• pouring a base concrete mixture to define a base concrete layer having an exposed upper outer surface, the base concrete mixture including cement and large aggregate;
• preparing a surface concrete mixture including cement, small aggregate, and sand, the small aggregate being smaller than the large aggregate used in the base concrete mixture, the small aggregate and sand being mixed into the surface concrete mixture to define a prescribed color;
• and
• pouring the surface concrete mixture over the exposed upper outer surface of base concrete layer while the base concrete mixture is in an unhydrated state to enable bonding between the surface concrete mixture and the base concrete mixture, the surface concrete mixture defining a surface layer over the exposed base concrete layer.