Non-destructive Evaluation of Concrete Tank in Gatineau

The Problem

Non-destructive Evaluation of Concrete Tanks - Oxygen Reactor

FPrimeC was retained by Résolu Produits forestiers in Gatineau, QC, to conduct non-destructive evaluation of concrete tank. The oxygen reactor was a rectangular concrete tank with overall dimensions of 80m x 40m, and a height of approximately 5 m. Horizontal, vertical and diagonal cracks were observed in the exterior surface of concrete. Client was interested in a comprehensive of existing condition of the structure, and possible repair solutions.

The main objective of this investigation project is to:

  • Locate, Identify, and measure existing cracks (arm-length visual inspection)
  • Evaluate depth of cracks using NDT methods
  • Evaluate the extent of existing cracks
  • Prepare preliminary maintenance plan for concrete walls of the Oxygen Reactor structure

The solution

Ultrasonic Pulse Velocity for Evaluation of Concrete CracksThe field work involved close-up inspection of existing cracks and surface defects on the concrete walls and performing non-destructive evaluation of concrete tank in select locations. The following non-destructive testing (NDT) methods were used in this inspection program:

  • Ultrasonic Pulse Velocity (UPV) for estimation of depth of cracks
  • Ultrasonic Pulse Echo for evaluation of thickness of concrete walls
  • Ground Penetrating Radar (GPR) for evaluation of steel rebar layout, and estimation of cover thickness

Ground Penetrating Radar for non-destructive evaluation of concrete walls and concrete tanks