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POST-TENSIONING JACKS. • A double-acting jack must have both hoses and all couplers securely connected to both ports. If one of the two ports is restricted or becomes disconnected, pressure will build and the jack, hose or coupler can burst, possibly causing serious injury or death.

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Post-tensioning strand systems. VSL designs, manufactures and installs durable, state-of-the-art post-tensioning systems that comply with international standards and approval guidelines for both new and existing structures.

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Ironworkers Union: Developed by Jim Rogers at Evaluation and Certification Services (publishers of Post Tension Magazine), this program offers two programs, to certify installers of single strand unbonded post-tensioning installers and bonded post-tensioning installers. Rogers says they conducted over 2000 exams in 2007 and are ahead of that ...

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. For an excellent overview of PT, visit the Post-Tensioning ...