Whether cast-in-place, pre-cast, reinforced or unreinforced, concrete is the most-widely used construction material in the world. Many of these structures have been neglected without routine maintenance for many years, and subjected to non-climate controlled conditions. Consequently, concrete structural members have experienced significant deterioration, as shown below. Concrete spall near the base of a column exposing embedded, corroded reinforcing steel. Original design reference documents containing information about construction materials are often no longer available for these older buildings.