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Pre-tensioning vs. Post-tensioning By controlling the amount of prestress, a structural system can be made either flexible [portal frame], or rigid [floor slab] without influencing its strength. Prestressed, pre-tensioned, tendons are tensioned by a jack without any concrete.

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Post-Tensioned Concrete ... Most precast, prestressed concrete is actually pre-tensioned-the steel is pulled before the concrete is poured. Post-tensioned concrete means that the concrete is poured and then the tension is applied-but it is still stressed before the loads are applied so it is still prestressed. ... PT Construction Basics. The ...

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Cast-in anchor channel embeds provide simple, adjustable connections for restraining concrete panels. They are foam-filled and predrilled with nail holes upon delivery, and ready to install. Use the company's tee-bolt and nut, restraint strap, and spring nut to create sliding or fixed connections.

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Based in San Francisco, Calig., Westco Systems Inc. specializes in offering material for steel products in the construction industry. Founded in 1998, the company offers recast/prestressed concert (PC strand), tie wire, anchor bolts, slab bolsters and other concrete accessories across United States.