Cor-Tuf is the exclusive licensed producer of Cor-Tuf Ultra High Performance Concrete (UHPC) in the United States and the world. Cor-Tuf UHPC is the premier material for Low Impact Design (LID). It is a class of concrete that is exceptionally strong, durable, and cost effective.Apr 25, 2019 The first modern use of lightweight concrete (LWC) was recorded in 1917, when the American Emergency Fleet Corporation started building ships with this mixture due to its high strength and performance. Since then, LWC has become a common building material for constructing sturdy load-bearing walls,.