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    PTSI provides Unbonded Post-Tensioning System which is a means of complementing the strength of the concrete in compression and overcoming its weakness in resisting tetnsion. Post-Tensioning Systems apply compressive force to the structure through the stressing of high strength steel strand with specialized anchorage assemblies.

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    And in post tensioning terms we call this pipe a 'duct'. And duct can come in 2 types of shapes round and flat. A steel corrugated flat duct is pressed into shape from a steel corrugated round duct and it is generally used for slab anchorage (not limited).

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