Post Tension Cables
Agenda .
Introduction .
Basics of Post-Tensioning / Prestressed Concrete .
Common Problems with PT Concrete .
Solving Problems with PT Concrete . Common Modifications- New Penetrations & Openings .
PT Concrete Condition Assessment Process and Tools
POST-TENSIONED CONCRETE REPAIR
Post-tensioned (PT) concrete deteriorates due to corrosion of post-tensioning strands. Corrosion can occur in grouted and ungrouted post-tension structures leaading to post-tension cable repair, in the presence of moisture and air in voids along the cable tendon.
Early identification and mitigation of corrosive conditions can significantly reduce the costs of major repairs and the risk of structural failure. Where previously, non-destructive tests and methods of corrosion protection were not available, Vector’s Post-Tech evaluation, drying, and grease injection systems of testing and protection can now be used.
Post-Tech® PT Corrosion Evaluation is a patented non-destructive test that identifies, and indirectly measures the extent of probable current or future corrosion deterioration in heat sealed or push-thorough cables exposed to a “wet” or potentially corrosive environment.
Post-Tech® PT Cable Drying is a corrosion mitigation process where the moist air from the PT cable is replaced by dry non-corrosive air. The process is monitored and the treatment is ended only when dry condition of the cable is confirmed. The PT cables that require this treatment are selected by the Post-Tech PT Corrosion Evaluation process.
Post-Tech® PT Grease Injection is a proven cost-effective process where special rust-inhibiting grease is injected under pressure into the PT cable sheath filling cable voids, cracks, and porous grouts along the PT cable. Post-Tech PT Grease Injection is performed right after the Post-Tech Cable Drying process to prevent or minimize further corrosion deterioration.
Post-Tech® Impregnation is designed to mitigate corrosion of grouted post-tension tendons, the process involves pushing an impregnation placed along the length of the tendon, leaving an anit-corrosion barrier film on the surface of the steel.
PT Repair and Replacement is the only option for PT cables that were identified as damaged during the post-tension evaluation process. The repair includes the replacement of entire deteriorated strands, the replacement and coupling of portions of strands, and anchorage repairs. Vector has the experience and capabilities to perform the repairs as well as provide the appropriate calculations for the tensioning of the strands.
For more information and details please visit our Post-Tech PT Corrosion Solutions webpage.
Applications:
Bridges
Parking Structures
Buildings (especially Balconies and Rooftops)
Benefits:
Early detection resulting in lower maintenance costs
Extension of structure life span
Confirmation and/or restoration of original design parameters
Increased safety
Sample Project Histories:
Apartment Complex PT Slab (PDF)
Product Information
Post-Tech PT Corrosion Evaluation
Post-Tech PT Cable Break Detection
https://www.vector-construction.com/post-tensioned-cable
Repair & Modification of Post-Tensioned Concrete Structures: Products & Services
For the repair and modification of post tensioning (PT) systems as well as post-tensioned concrete structure repair and protection, STRUCTURAL TECHNOLOGIES offers highly specialized products and services including investigation, repair design support, repair and replacement components, corrosion protection products, strengthening solutions as well as new or replacement post-tensioning systems.
Our specialized PT repair offering is designed to assist engineers, owners and contractors to maintain or extend the service life of their PT structures – by providing solutions throughout the entire process – from initial assessment through field implementation.
When installing STRUCTURAL TECHNOLOGIES’ post-tensioning repair products and systems, our repair and maintenance companies provide our clients with the reassurance that our technology solutions are being installed by experienced professionals with the highest standards for quality control and safety.
We help solve common problems with post-tensioned concrete:
Modifications
Damage
Deterioration
Design & construction error