Some challenges of intervening with post-tensioned tendons are high forces, not being able to see the corrosion and ensuring safety. With an increased interest in preserving existing bridges, the guarantee of well-inspected and well-maintained tendons becomes even more critical.

This requires:

• Proficiency in understanding the diverse pathologies affecting post-tensioned (PT) tendons, including voids, soft rout, chloride-induced corrosion, etc.
• The ability to accurately diagnose PT tendon pathologies using cutting-edge Non-Destructive Testing (NDT) techniques tailored to post-tensioning. These techniques encompass endoscopy, tapping, magnetic flux, acoustic emission, and others.
• Specialized expertise in implementing targeted repair techniques, specifically for duct repair, void filling, external tendon replacement, and other relevant procedures.

A variety of NDT and repair techniques are available, and it is essential to find the one that is best applicable to the structure’s condition and the post-tensioning system.