Bridge Deck Evaluations for DelDOT to Evaluate Extent of Bridge Deck Delaminations using Impact Echo Technology
As the age of DelDOT’s Bridge Decks and wearing surfaces continue to climb, Pennoni provided Impact Echo testing to evaluate the extent of latent and developing deck delaminations on 51 Interstate bridges with overlays and also 26 bare deck bridges in New Castle County, Delaware. Testing was performed and data collected on a 2’ x 2’ grid. The data was then interpreted and a full-color deterioration map developed showing the severity of delaminations in the bridge deck. A final report was developed for each set of bridges (with overlay and without) providing recommendations for prioritization and/or comparisons of bridge deck age and delaminations. Once delamination quantities were developed, those quantities were used in the biennial bridge inspection reports to properly determine element level condition state quantities.