Monthly Archives: October 2009

VIDEO: Chicago Model City

I visited the “Chicago Model City” exhibit this weekend.  The 3-D architectural models gave me a great birds-eye-view of downtown Chicago.  The great thing was that I could see a lot of our Post Tensioned High-Rise Buildings within a 320 square-foot … Continue reading

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Unbonded Post Tensioning – Protection

Lately, a lot of focus has been given to the technical aspects of unbonded post-tensioning systems.  At times, however, the construction team must not forget the basic performance issues involved with post tensioning.  In particular, the proper protection of unbonded post-tensioning tendons is fundamental … Continue reading

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VIDEO: Field Friction Test for Post Tension Tendons

This educational video from AMSYSCO, Inc. shows the process for determining the Friction Coefficients. Post Tensioning Institute (definitions): Friction Loss:  the loss of stress (force) in a prestressing tendon resulting from friction created between the strand and sheathing during stressing. … Continue reading

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