What is Post-Tensioning
Post tension is a technique for reinforcing concrete. Pre-stress steel cables inside plastic conduits or pipes, are positioned in forms before the concrete is placed. Once the concrete has strengthened, but before the service loads are applied, the cables are pulled tight, or tensioned, and anchored against the outer edges of the concrete.
Pre-stressing simply means that the steel is stressed (pulled or tensioned) before the concrete has to support any loads. This method can be used in building long span bridges, floors, and even beams. Most precast, pre-stressed concrete is actually pre-tensioned. This means the steel is pulled before the concrete is poured.