High-speed NDT technologies such as ground penetrating radar, infrared thermography, and impact echo scanning have been increasingly used in recent years for bridge deck condition assessment. However, up to now these technologies have not been widely adapted or accepted for three main reasons:
Highway agencies are not fully aware of the capabilities and limitations of these methods or how they can best be used.
Some agencies have had less-than-positive experiences with NDT techniques, perhaps because of unrealistic expectations and the improper use of these technologies.
Contractors not skilled or qualified in the advanced interpretation of electromagnetic methods, advanced wave theory and engineering design. Interpretation of data should only be performed by a Senior Engineering Geophysicist.