NDT uses sonic/ultrasonic pulse velocity and impact echo measurements in bridge and bridge deck testing to determine the dynamic strength of concrete and identify and map areas of weak, delaminated concrete as well as determine thickness of concrete elements and length of pile foundations. We also use ground penetrating radar (GPR) in bridge and bridge deck testing to determine rebar spacing and depth of cover and locations of cracking and delamination with moisture entrapment. Half-cell measurements are used to determine the potential of rebar corrosion.