Federal Highway Adminstration

 Typical HIghway Overpass

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Seismic refraction using tomography to identify subsurface material properties and their distribution. Low-speed ground penetrating radar to identify concrete quality and areas of concrete deterioration, and areas of concrete delamination for bridge decks. Seismic reflection to locate voids beneath roadways. Ground penetrating radar to image different layers of structural steel in concrete. High-speed ground penetrating radar to define the thickness and quality of road surface and subgrade materials. 3-D Crosshole sonic logging tomography to evaluate concrete quality and intergrity in drilled shaft foundations. Sonic echo showing the time history and the frequency response for defect indentification in drilled shafts. Spectral and multi-channel analysis of surface waves to assess pavement and subgrade conditions. Direct current electrical resistivity to identify lateral and vertical variations of geologic materials. Electromagnetic conductivity to map the presence and latera/vertical distribution of clay beneath paved roads. Ground penetrating radar to map the presence and extend of voids beneath concrete slabs or walls. Ground penetrating radar to image structural reinforcement and identify concrete deterioration within bridge decks.

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