It lets us design longer spans in elevated members, like floors or beams. Advantages of post-tensioning : Longer Spans The duct is then grouted to provide corrosion protection and to bond the strand to the concrete members. When the tendons have extended to the design specifications, they are wedged in position to maintain tension after the jacks are removed. Once the concrete has achieved required strength, the tendons are stressed by hydraulic jacks. Steel strand (12.7mm typically) is pushed through the duct (known as tendons) and the concrete is poured. Galvanised duct which is profiled using bar chairs follows the area where otherwise tension would occur in the concrete element. Post-tensioning is a method of applying compression after pouring concrete. Post tensioning is a technique for reinforcing concrete.
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