ACI 533R-11
The widespread popularity of concrete as a building materialcan be attributed to the availability, favorable properties,and geographic distribution of its naturally-occurringmineral constituents. Concrete is easily formed and molded,comparatively economical, and durable in its finished state.Architectural precast panel use has increased because of thenature of concrete as a material and the fact that prefabricatedcomponents add to construction efficiency. By exposingdecorative aggregates, using veneer facing materials, and byvarying sizes, shapes, and textures of panels, the engineer/architect can respond creatively to client needs.