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Pre-stressing of concrete can be achieved by two different methods namely pre-tensioning and post-tensioning.

In post-tensioning process the ducts are first laid in the form of the actual deflection pattern of the beam profile and the casting of the beam is done first. After the concrete is matured high yield high tensile steel wires as tendons are then inserted through the ducts and the post-tensioned forces are applied equally through both ends of the ducts. In post-tensioning, the whole section of the beam can be used as most of the total cross-section stays in compression.
Post-tensioned beam profile has been shown in the below figure.
Photo from Sachin Kataria