Signs of post-tensioned cable failure can include the following and will require immediate repairs to restore strength and integrity to the structure:
Typically, however, there are no outward signs of distress and installation of inspection recesses is the only way to check if cables are still tensioned. Installation of inspection recesses involves chipping into the underside of your concrete slab and exposing small portions of cables for review. Exposed cables can be reviewed at inspection recesses to check for corrosion and to see if they are broken.
Miyagi Construction can assist with an inspection of your post-tensioning system by chipping small inspection recesses into the underside of your concrete slab and exposing small portions of cables for review. Exposed cables can be reviewed at inspection recesses to check for corrosion and to see if they are broken. If broken cables are found, Miyagi Construction can replace them with new, fully-tensioned cables. Miyagi Construction can also review your structure and complete appropriate waterproofing upgrades that will reduce further corrosion related deterioration within your post-tensioning system.
Barrier cables used in parking garages are similar to post-tension cables in concrete slabs and are subject to similar deterioration mechanisms. In some cases the failures occur quicker since the cables are directly exposed to the elements and do not have the added protection provided by concrete cover. Replacing barrier cables and anchors requires the same expertise as repairing post-tension tendons.