Understanding the properties and characteristics of concrete
                      December 1, 2012
                     
                      Structures surround the modern world. Buildings, bridges, roads, and tunnels are everywhere. By definition, a structure is something made up of parts that are held or put together in a particular way. In construction, structures are designed by architects and engineers, and built by contractors or builders using many different materials. The most common, however, are concrete, steel, timber, plastic, and glass.