Application of Ground Penetrating Radar (GPR) in Non-Destructive Pavement Investigation

Ground Penetrating Radar (GPR) is a modern and effective non-destructive method for pavement investigation, based on the use of high-frequency electromagnetic waves. This technology enables the acquisition of detailed information about pavement structure, including layer thickness, material properties, moisture content, and the presence of various types of internal defects, without the need for destructive intervention.

This paper presents the application of GPR technology for pavement evaluation, using a case study from a selected section of Highway 401 in Canada. The study involved an assessment of pavement condition using both traditional methods (visual inspection, core drilling, and laboratory analysis) and data obtained from GPR measurements. Particular attention was given to the calibration of GPR data against core sample results, ensuring the accuracy and reliability of the obtained measurements.

The results demonstrated that GPR can accurately determine the thickness of asphalt and concrete layers, with minimal deviation when compared to data obtained from core drilling. In addition, the technology proved effective in identifying hidden structural elements and defects, such as reinforcement, concrete joints, partial and full-depth repairs, as well as cracks that are not visible during surface inspections.

The findings indicate that GPR is a valuable tool for comprehensive pavement assessment, particularly in the case of composite structures where traditional methods are limited. Its application significantly improves diagnostic accuracy, reduces investigation costs, and supports the optimal planning of rehabilitation and reconstruction processes.