Longitudinal and transverse post-tensioning was used in the deck, which was cast-in-place using a form traveler. External prestressing is a kind of postprestressing method, in which prestressing tendons are located outside the concrete section and the prestressing force is transferred to a structural member through end anchorages or deviators, as shown in Fig. The tendons are then anchored at each stressing end.The concrete is compressed during the stressing operation and the prestress is maintained after the tendons are anchored by bearing of the end anchorage plates onto the concrete.After the tendons have been anchored and no further stressing is required, the ducts containing the tendons are often filled with grout under pressure. Tensile forces in the steel are transferred to the concrete by bonding between the steel and concrete. It is done in factories. Prestressing; Post Tensioning; In prestressing, prestress bars are stressed initially and then the construction of concreting work is done. Solve this simple math problem and enter the result. The prestressing system works for a span greater than 35m. Research on the durability performance of in-service prestressed structures has been undertaken since the 1960s,The durability of prestressed concrete is principally determined by the level of corrosion protection provided to any high-strength steel elements within the prestressing tendons. Internal prestressing can be done by two methods:This method is not commonly used. Pretensioned Concrete. Some of the popular methods of post-tensioning in prestressed concrete are: Freyssinet system; Magnel system; Leonhardt system; Lee-McCall system; Gifford-Udall system Some notable building structures constructed from prestressed concrete include: Concrete is the most popular structural material for bridges, and prestressed concrete is frequently adopted.In short-span bridges of around 10 to 40 metres (30 to 130 ft), prestressing is commonly employed in the form of precast pre-tensioned Concrete dams have used prestressing to counter uplift and increase their overall stability since the mid-1930s.Most commonly, dam prestressing takes the form of post-tensioned anchors drilled into the dam's concrete structure and/or the underlying rock strata. It induces internal compressive stresses in concrete. The conduits, sleeves and the metal tubes with unstressed tendons inside located in the form and the tendons are stretched. Prestressing enhance shear strength and fatigue resistance of concrete; Dense concrete is provided by prestressing systems thus improving the durability; Best choice for the construction of sleek and slender structures. As we generally know that concrete is the mixture of three main ingredients which are cement (fine mixture of clay, limestone, and small amount of gypsum ground up to the desired degree of fineness), sand (only river sand or obtained through pit) and aggregate (Made form blasting and grinding from rocky soil) and when we add water (free from impurities) in this mixture it creates concrete which we use for v… Post-tensioning: In this system, reinforcement is tensioned after the concrete is hardened, leaving the ducts to first insert the cable to the beam. The grills do not offer any appreciable frictional resistance to the wires which can be moved relative to each other during the tensioning process.This is earliest method in this method the wires are stressed and anchored one by one in separate cylinder using small wedging grips called In this system also the wires are tensioned individually. The wires in the same layer and the wires in adjacent layers are separated with a clearance of 4 mm.