By admin, on January 28th, 2010%
Shows the Plastic Extrusion process for Unbonded Post-Tensioning. Raw materials include steel PC Strand, corrosion-inhibiting Post Tensioning coating and HDPE plastic with color concentrate.
The steel strand is moving at over 200 feet per minute in the extrusion machine. First the steel PC strand is coated with corrosion-inhibiting Post-Tension Coating (“grease”). Then, the coated steel has either . . . → Read More: VIDEO: Plastic Extrusion of PC Strand for Unbonded Post-Tensioning
By admin, on October 27th, 2009%
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 area.
The “Chicago Model City” exhibit is open daily and the Chicago Architecture Foundation gives a history of . . . → Read More: VIDEO: Chicago Model City
By admin, on October 7th, 2009%
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.
Wobble: the friction caused by the unintended horizontal deviation of the tendon.
Angular Curvature: the friction caused by the . . . → Read More: VIDEO: Field Friction Test for Post Tension Tendons