Prestressing is a technique of introducing stresses of a predetermined magnitude into a structural member to improve its behavior. Prestressing is used to introduce compression into regions where tension stresses will be created by applied loads. This technique is usually found in concrete beams, spandrels, columns, single and double tees, wall panels, segmental bridge units, bulb-tee girders, I-beam girders, flat slabs and hollow core slabs to name a few.