Infrasense, Inc., a national leader in infrastructure nondestructive evaluations, will evaluate nearly 500 bridge decks in 2015 with ground penetrating radar or infrared thermography. These bridge decks are located in Wisconsin, Nevada, Ohio, Wyoming, Montana, Connecticut, Idaho, Michigan, and New York. The total survey area of these bridge decks is over 4 million square feet. The projects vary from evaluating a single 1.5 mile long viaduct to corridor and statewide deck condition studies consisting of 120 bridge decks.
Infrasense’s 2015 projects include the use of ground penetrating radar (GPR), infrared thermography (IR), and high resolution video surveys to evaluate the condition of bridge decks. Ground penetrating radar data is collected at highway speeds to detect rebar depth, corrosion conditions, and deteriorated concrete. Infrared thermography surveys are carried out at up to 50 mph and data collection consists of a series of passes across each deck, with each pass covering a deck width of between 12 and 15 feet. The IR data is used to quantify and map rebar-level delaminations. The high resolution video data is collected concurrently with the infrared data, and allows for subsequent mapping of patching and spalling.
Infrasense has played a key role in the development and implementation of GPR, Infrared Thermography, and other NDT methods for evaluating transportation infrastructure over the past 27 years. One of the most common applications of the ground penetrating radar technology is the identification of corrosion-induced delamination, and the estimation of rebar depth on bridge decks. Decks that are in good condition consist of strong and uniform radar reflections from the rebar, whereas weak and inconsistent reflections indicate rebar-level bridge deck deterioration. Unlike traditional sounding, GPR requires no lane closures and provides a timely and cost-effective means of obtaining continuous bridge deck data. This data is accurate and objective, and can be used for network-level bridge management or project-level rehabilitation design.