Corrosion induced bridge deck delamination is a common problem in reinforced concrete decks. Complementary approach using impact echo (IE) and ground penetrating radar (GPR) testing was conducted on asphalt-overlaid bridge decks on I84 Interchange in Connecticut. In the first phase of testing GPR survey was conducted on nine decks. The decks were GPR surveyed, at 50 km/h, with two objectives. The first one was to estimate concrete deterioration quantities (% of deck area) prior to recommending deck repair or replacement. The second objective was to identify zones of higher deterioration that were later evaluated by IE for possible delamination. A portable seismic pavement analyzer (PSPA) was used for the IE assessment on four bridge deck sections. The results of IE evaluation are presented in terms of condition assessment maps, where zones of different condition grades or different degrees of delamination are identified. The results were correlated to the GPR data to assist in definition of a suitable deterioration threshold separating sound concrete from deteriorated sections within the deck. These two non-destructive evaluation techniques, along with 15 cores and 15 chloride samples from the three decks, were used to finalize the deterioration assessment. For two of the three interstate decks tested, the PSPA testing and analysis was useful in helping establish the GPR deterioration threshold. On the third no obvious correlation could be seen, so the chloride test results were used to help constrain the GPR data.
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Building and Construction
- Geotechnical Engineering and Engineering Geology