Post-tensioning can be explained as the method of reinforcing girder with high-strength steel strands or bars, typically referred to as tendons. Their applications include commercial buildings, residential buildings, parking structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, and water-tanks.
Post-tensioning tendons, which are prestressing steel cables inside plastic ducts or sleeves, are positioned in the forms before the concrete is placed. Afterward, once the concrete has gained strength but before the service loads are applied, the cables are pulled tight, or tensioned, and anchored against the outer edges of the concrete. It has become an integral part of girder.