Ground Penerating Radar (GPR)

Ground-Penetrating Radar is a geophysical, nondestructive testing technique that allows for the detection of embedded objects, material interfaces, and internal characteristics in structural and geological materials. JS Building Diagnostics utilizes the latest equipment specially developed for use on structural concrete and software that offers real-time assessment, sophisticated post-processing capabilities and 3D tomographic imaging of structural elements. The GPR is an invaluable tool in JS Building Diagnostics' structural investigations.

Methodology

The GPR technique involves the transmission of electromagnetic waves along discrete longitudinal scans at the surface of a structural element or geological material. Electromagnetic signals are optically reflected from material interfaces of varying dielectric constant along the propagation path of the wave. JS Building Diagnostics utilizes a range of GPR antennas with different operating frequencies to provide efficient, cost-effective surveys at various penetration depths.

Common Application

Structural Concrete

  • Detection of steel reinforcement, prestressing / post-tensioning strand, metal and plastic conduit, and other embedded objects

  • Approximate thickness of measurement of members

  • Assessment of as-built reinforcement and geometry to assist in structural analysis and load capacity evaluation

  • Identification of internal conditions such as poor consolidation, voiding and material interfaces

Masonry Walls

  • Identification of vertical reinforcing bars, horizontal bond beam and joint reinforcement, and embedded roof anchorages

  • Assessment of grouted and ungrouted conditions in concrete block cavities

Slab-on-grade and Pavements

  • Detection and location of mild steel reinforcement and joint dowels

  • Assessment of approximate slab thickness

  • Identification of material interfaces in layered systems

  • Assessment of the presence of and extend of voiding at slab to sub-base interfaces

Subsurface Investigation

  • Assessment of location and approximate depth of buried utlity pipe and structures