Wisconsin

Network-Level and Aerial Bridge Deck Evaluations in Wisconsin

Infrasense, through multiple work orders, has conducted infrared thermography (IR, per ASTM D4788-03) and ground penetrating radar (GPR, per ASTM D6087-08) surveys on over 1000 decks representing over 10 million sq. ft. in Wisconsin’s SW, NC, NW, NE, and SE regions. In 2017, Infrasense conducted surveys on over 130 decks. All GPR data collection has been carried out at driving speed without lane closures, while the IR data has been collected using a rolling closure system. The GPR and IR data collection efforts are supported by OMNNI Associates of Appleton, Wisconsin.

The most basic level of bridge deck condition evaluation performed by Infrasense is Level 0. This relatively new approach quickly and efficiently provides an estimated level of delamination at a network level. In 2017, Infrasense participated in a pilot study to determine the feasibility of performing infrared surveys using a fixed-wing aircraft by comparing aerial and vehicle-based data for four bridges in La Crosse. The results of that comparison were positive, and in 2018 Wisconsin selected 120 bridge decks to be surveyed and analyzed with the Level 0 approach.

For vehicle-based bridge deck testing, Level 1 evaluations are carried out for each deck to determine deterioration quantities and to identify decks with significant deterioration quantities. These decks are selected for a more detailed Level 2 evaluation, including the preparation of plan-view maps showing delaminated and deteriorated deck areas.