High-resolution ground penetrating radar (GPR) is a non-destructive technique used for monitoring road surfaces. The latest version of DMT’s vehicle-mounted, inherently safe and high-speed measuring system is specially adapted for this application. The fast measuring speed with simultaneous GPS georeferencing usually allows measuring to be carried out in the general flow of the traffic. Smaller areas can be examined as required using a flexible hand instrument.

It is possible to obtain a range of different information from GPR results depending on what the focus of the investigation is:

• Design of layers and layer thickness
• Division into homogeneous sections of similar design
• Transverse design, distance from specific fixtures, spread
• Optimised drilling plan for obtaining representative drill cores
• Damage analysis and assessment

In addition to using the standard layout with line-based measurements, it is possible to carry out investigations of entire surfaces applying so-called array or scanner systems; these are ideally suited for performing object-oriented damage analysis.