Post-Tensioned Concrete – Evaluation and Repair Solutions

Post-tensioned (PT) concrete deteriorates due to corrosion of unbonded post-tensioning strands in the presence of moisture and air in voids along the cable sheaths.

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 high 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.

PT Repair and Replacement is the only option for PT cables that were identified as damaged during the Post-Tech PT Corrosion 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 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.


  • Bridges
  • Parking Structures
  • Buildings (especially Balconies and Rooftops)


  • 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 Overview
Post-Tech PT Corrosion Evaluation
Post-Tech PT Cable Drying
Post-Tech PT Grease Injection
Post-Tech PT Cable Break Detection