Ground Penetrating Radar (GPR) is a geophysical inspection method used to scan the surface in various areas of application, including concrete structures such as buildings, dams and bridges.

Unlike destructive methods, which can be invasive, time-consuming and cause damage to the structure, GPR allows inspection and assessment without damaging the integrity of the concrete or requiring the operation to be stopped. This non-destructive testing method stands out for its rapid execution and for providing results in image form, which makes it especially interesting in situations where design documentation is poor. It can be used to verify the compliance of reinforcement with the design and as a support for other tests involving the configuration of reinforcement.

The principle of operation of GPR is based on the emission of electromagnetic waves towards the surface of the concrete by means of special antennas. These waves are reflected by the different layers present in the concrete, such as the steel reinforcements, and return to the GPR device, providing information about the characteristics of the material. With proper interpretation of the results, it is possible to locate and map embedded reinforcement at depths of up to 80 centimeters.

The advantages of using GPR are manifold. Firstly, the reliability and accuracy of the results are highly recognized. In addition, data collection is fast compared to destructive methods such as quarrying or drilling. GPR also offers the advantage of providing high-resolution images, allowing a detailed visual analysis of the main structural elements. Its portability and agility make it suitable for external surveys, facilitating inspection in different locations.