Abstract
The Ministry of Transportation, Ontario has taken a leading role in applying the latest technology to the rehabilitation of bridge decks by developing a system called Deck Assessment by Radar Technology (DART). Impulse radar signals propagate through the bridge deck materials and reflect wherever there is a change in the dielectric properties of the propagation medium. This change in dielectric constant is usually an indication of: an interface, such as the asphalt-concrete boundary; or, a layer of reinforcement; or damaged structure, such as a delamination. In this paper, temporal waveforms obtained from real bridge decks are presented and spectral plots are employed to gain insight to the signal properties. A methodology for the detection of delamination is presented which evaluates the shape of the reflection at the concrete boundary. The results from two actual surveys are presented which highlights measurements of asphalt thickness, cover over reinforcement, and detection of delaminations obtained by DART survey. It is demonstrated that DART survey provides predictions very close to actual deck conditions.
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