Concrete is a composite building material used in construction. It is made from a combination of aggregate, such as gravel and sand, and cement binder. An interesting fact about concrete is that, while most people assume that concrete solidifies because it dries after mixing and pouring, it actually does not. Instead, concrete undergoes a process called hydration, in which, rather than solidifying because of water evaporation, it solidifies due to the chemical gluing of the components together forming a stone-like material. Concrete is commonly used to make building foundations and structures, pavements, parking lots, and bricks. Over time, many concrete constructions will need repair or restoration. In these cases, it is a good idea to call in professional concrete repair and restoration services.