Appraisal Of Techniques To Reduce Embedment Friction While Post-Stressing Concrete
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1978-03-10
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Edition:Final Report
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Abstract:In this report, two concepts for reducing friction losses along post-tensioned tendons in pavement slabs are studied. One concept involved the use of vibration techniques to increase stressing efficiency, and the other concept included the reduction of friction coefficient through the use of a material which would also act as a grout after stressing the tendon. For the vibration techniques, three vibration systems were constructed and tested. One was based on the use of hydraulic pressure pulsations to cause a sharp jerking action on a tendon. The desired effect was not accomplished with the system constructed. The other two systems used impact generated vibrations, which affected normal forces along the tendons. The impact vibrations did produce changes in the friction losses but not that which would be desirable for post-tensioned tendons in long pavement slabs. Grout materials tested were two, 2-part and two heat cure epoxy resins. Tendon heating through the use of an AC arc welder was also investigated in order to determine the feasibility of this method for setting the heat cure epoxies. The results of these tests were inconclusive but do show promise for future investigations.
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