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How To Properly Inspect Post Tension Tendon -A Critical Infrastructure Component

wire rope post tension tendon inspection

Update Post Tension Tendon Inspections with MRI-like inspection of external “post-tensioned” tendons using TendonScan®®


Post tensioned tendons are prestressing steel cables inside plastic ducts or sleeves that are positioned in the forms before the concrete is placed. … Prestressing simply means that the steel is stressed (pulled or tensioned) before the concrete has to support the service loads.

The engineers at Infrastructure Preservation Corporation were concerned with the visual and subjective inspections that were taking place on such a critical infrastructure component like post tension tendons. 


post tension tendon inspection

TendonScan  Locates loss of metallic area inside a post tensioned tendon.

Post tension tendon inspection
wire rope post tension tendon inspection

TendonScan is IPC’s comprehensive post tension & Robotic testing system utilizing the latest non destructive evaluation (NDE) and nondestructive testing (NDT) technologies to deliver an MRI-like inspection of “post-tensioned” tendons on large segmented bridges.  


Infrastructure Preservation Corporation (IPC) Utilizes Magnetic Flux Leakage (MFL) . The combination of MFL technology, software and robotics allows TendonScan® to peer through the external sheathing to locate loss of metallic area-corrosion inside the steel strands to critical to a stable infrastructure.

The battery operated, lightweight unit utilizes MFL “Magnetic Flux Leakage” to peer through the HDPE wrapping and inspect the steel that is critical to the assets integrity.  The inspector running the unit via a manual or robotic remote control.  The information received by the sensor head is transmitted back to the base station where an inspector monitors the results to mark any discontinuities along and within the tendon in real time. 

IPC’s TendonScan®

Scan services identifies deficiencies such as:

●      Corrosion

●      Section Loss

●      Surface Anomaly’s

●      Deterioration Progression over time

Magnetic flux leakage
Post tension tendon inspection service

TendonScan® can monitor deterioration progression over time  to help asset owners better plan for maintenance and repairs!

post tension tendon inspection

As the Tendon inspection unit makes its way down the entire length of the tendon areas showing loss of metallic area are both marked with a ribbon showing the location and loss of metallic area :”LMA”


If we are to preserve our infrastructure in a safe manner manual and subjective inspections ( a helmet flashlight, pad and pencil) need to be a thing of the past and modern technology that can provide quantitative results for asset owners should be quickly adopted if not mandated.



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