Concrete Scanning and Imaging

Ground penetrating radar (GPR) is regularly applied to examine concrete structures such as walls, floors, columns and bridges. It has recently gained popularity for concrete imaging. GPR has great advantages over more traditional methods including:
  • Capability of greater depth penetration (up to 18 inches at high resolution)
  • Ability to resolve second layer of rebar (subject to spacing)
  • Ability to determine slab thickness
  • Ability to detect air voids, conduits and pipes (including plastic), post tension cables, etc.
  • Screed does not have to be removed to map rebar in floor slabs
  • Generally only one-sided access is required
  • Capable of producing depth slice images and 3D models
Concrete Scanning and Images, NJ, NY, Concrete scanningHistorically only X-ray technology created a photographic image of the concrete interior however it required access to two sides of the structure and also involved the utilization of hazardous X-ray sources.

Detailed imaging of reinforcement is possible by scanning at close centres on a regular orthogonal grid. The results are processed using specialist software and depth slices or even a 3D model of the reinforcement may be made.

Alternatively, if depth and rebar spacing is required, this data could be shown graphically or exported into a spreadsheet for statistical analysis including contour plotting.