Analysis of Radar Reflections From Asphalt Covered Bridge Deck Structures

Bridge deck condition assessment by using GPR: a review

“…This is why GPR can detect corrosion-induced delamination, but not cracking due to traffic overloading which is not visible on radargram. In the late 1980's and early 1990's, most of applications of GPR that were dedicated to detection of deteriorated areas in bridge decks [18][19][20][21][22][23][24][25][26][27]. These surveys were mainly conducted with high frequency 1GHz air-coupled antennas [28].…”

Classifying impulse radar waveforms using principle components analysis and neural networks

“…Some bridge decks also have a waterproofing membrane, which is a tar-based material, placed between the asphalt and the concrete in order to prevent water from entering the concrete. Previous studies [4] have shown that the radar waveforms may be interpreted incorrectly if there is insufficient information about the bridge deck structure. The error is usually due to improperly identified reflections from the concrete surface and the rebars.…”

NDT Transportation

“…The first vehicle-mounted GPR system for highways was developed under an FHWA contract in 1985 (Morey, 1998). In the early 1980s, GPR surveys were also started in Canada (see Manning and Holt, 1983;Carter et al, 1992). The other active area in the late 1970s and early 1980s was Scandinavia, where the first GPR tests with ground-coupled antennas were performed in Sweden (Ulriksen, 1982;Johansson, 1987) and Denmark (Berg, 1984), but the method did not receive general acceptance at that time.…”