In the construction industry, technology has made great inroads to process improvements. And research shows it. One major trend of late has been Infrasense, www.infrasense.com, Arlington, Mass., scans via subsurface investigations for bridge decks.

One recent study compared the predicted quantities for 12 decks surveyed by Infrasense against subsequent construction repair quantities. According to the research, on average, Infrasense’s predicted deterioration quantities were within 3.5% of the documented construction quantities.

In Minnesota, specifically District 6 and Metro regions, investigations of this sort by Infrasense have been carried out for 44 bridge decks. This amounts to 181 decks in Minnesota evaluated since 2009. As part of these tests, GPR (ground penetrating radar) tests were performed on each bridge deck, with underside visual inspections set for spring.

Surveys to determine Infrasense accuracy showed predicted quantities for 12 decks surveyed against subsequent repair quantities. According to the study, on average Infrasense predicted deterioration quantities were within 3.5% of documented construction quantities.

In Connecticut, Infrasense also used GPR to test bridge decks on two miles of state highway, with initial data analysis to define limits of structural sections of pavement throughout project limits. This was to test boundaries of concrete with asphalt overlay. This structure assessment was conducted with a dual-air coupled radar antenna system manufactured by GSSI (Geophysical Survey Systems) and synchronized with GPS to provide coordinates to determine pavement thickness.

This bridge supports testing, and innovation is key to network-level pavement management, project level rehabilitation design, or quality assurance of new pavements. More to come on this exciting technology, and how it is shaping our world, down to the bridges we drive across.