0.5” GTI ZERO VOID® SYSTEM

General Technologies, Inc. designs and supplies the most advanced and reliable Encapsulation Systems for Unbonded Post-tensioning available today.  The GTI Zero Void® Encapsulation System is a proven method of providing corrosion protection for unbonded tendons.  Our patented system consists of an anchor casting encapsulated in a thick polyethylene material with excellent chemical and cold temperature resistance. The GTI Zero Void® System has been approved by the International Code Council - Evaluation Services, Inc. (Report No. ESR-2515) and the City of Los Angeles Department of Building and Safety (Research Report No. 25791).
 
The GTI Zero Void® System eliminates the need to fill sleeves (tubes) with grease as required by ACI and PTI Guide Specifications.  The Zero Void® System uses seals to provide thermal tolerance for shrinkage of the sheathing and watertight sealing of the encapsulation.
 
The Zero Void® Fixed-End Anchor, or dead-end, is push seated in the fabricator’s plant using a GTI Push Seater thus eliminating pull seating of the fixed-end wedges and the need for a grease filled tube to protect the strand.  Also, the use of hand installed fixed-end Zero Void® Anchors with spring-loaded wedges can be accomplished in the field for special circumstances.
 
The GTI Nail-Less Pocket Former® is designed to eliminate the use of nails to fasten the stressing anchor to the edge form thus eliminating staining of the concrete surface.
 
The Zero Void® System eliminates the need to strip the plastic sheathing protecting the strand prior to stressing.  GTI has perfected a special tool, the GTI Sheathing Stripper®, to remove the sheathing from inside the anchor cavity immediately prior to stressing.  There is no bare strand exposure.
 
The Zero Void® System utilizes the GTI Plasma Cutter® to cut tendon tails after stressing. The GTI Plasma Cutter® generates a minimal amount of heat during cutting and has no effect on the heat treatment of the strand and the wedges compared to oxyacetylene torch cutting.  The GTI Plasma Cutter® quickly cuts the tendon tail to a precise length, unlike other methods, so that the Zero Void® Grease Cap can be quickly and permanently locked in place.
 
GTI’s patented Zero Void® Grease Cap was created especially for the Zero Void® System.  The cap is supplied as part of the Zero Void® System and is pre-filled with a precise amount of grease that is held in place by our patented clear membrane.  The clear membrane will be broken by the cut tail of the post-tensioning tendon when the cap is locked into place.  Once the clear membrane has been severed, the grease displaced by the tendon tail will fill the wedge cavity, further increasing the corrosion protection within the Zero Void® System.
 
Access information on the following 0.5” GTI Zero Void® System Products by clicking below:
     
0.5” GTI Zero Void® Fixed-End Anchorage
 
0.5” GTI Zero Void® Intermediate Anchorage
 
0.5” GTI Zero Void® Stressing-End Anchorage
 
GTI Plasma Cutter®  
GTI Sheathing Stripper®  

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See www.gti-usa.net/patents.shtml for a listing of many of the patents licensed to GTI, including patents that may cover one or more of the products identified on this page.

   

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