How highway bridges sing—or groan—in the rain to reveal their health

Oct 22, 2012
Professors Brian Mazzeo and Spencer Guthrie test acoustic-based measurement techniques in their lab. Credit: Mark A. Philbrick/BYU Photo

A team of BYU engineers has found that by listening to how a highway bridge sings in the rain they can determine serious flaws in the structure.

Employing a method called impact-echo testing, professors Brian Mazzeo and Spencer Guthrie can diagnose the health of a 's deck based on the acoustic footprint produced by a little bit of water.

Specifically, the sound created when a droplet makes impact can reveal hidden dangers in the bridge.

"There is a difference between water hitting intact structures and water hitting flawed structures," Mazzeo said. "We can detect things you can't see with a visual inspection; things happening within the bridge itself."

The study presents a more efficient and cost-effective method to address the mounting safety concerns over bridge corrosion and aging across the U.S. and beyond.

While impact-echo testing for bridges is nothing new to engineers, the BYU researchers are the first to use to produce acoustic responses. Current testing relies on solid objects such as hammers and chains.

A concrete bridge deck undergoes treatment for structural damage. A BYU study shows dripping water on the bridge can indicate structural flaws. Credit: Spencer Guthrie

The idea is to detect delamination, or the separation of structural layers, in a deck. The most common method involves dragging a chain over a bridge and marking spots where dull, hollow sound is produced.

However, this method can take hours to carry out for a single bridge and requires lane closures that come with additional complications.

"The infrastructure in the U.S. is aging, and there's a lot of work that needs to be done," Guthrie said. "We need to be able to rapidly assess bridge decks so we can understand the extent of deterioration and apply the right treatment at the right time."

The study results, published in the October issue of Non- and Evaluation International, could help transform deck surveys into rapid, automated and cost efficient exercises.

BYU Professor Brian Mazzeo tests acoustic-based measurement techniques in his lab by dripping water on a concrete surface. Credit: Mark A. Philbrick/BYU Photo

The method is as simple as dropping droplets of water on the material and recording the sound. The acoustic response indicates the health of the concrete.

"The response gives you an indication of both the size and the depth of the flaw," Mazzeo said.

Mazzeo said the could be used to test materials beyond bridges, including aircraft composites, which are susceptible to delamination.

Though the current research is preliminary, the researchers envision a day where bridge deck surveys would take only a few moments.

"We would love to be able to drive over a bridge at 25 or 30 mph, spray it with water while we're driving and be able to detect all the structural flaws on the bridge," Mazzeo said. "We think there is a huge opportunity, but we need to keep improving on the physics."

Explore further: Using sound to picture the world in a new way

Related Stories

Balsa bridges, with a twist

Oct 19, 2012

(Phys.org)—How much weight can a bridge made of balsa wood carry? When encased in a layer of fiber-reinforced resin, much more than you would expect, say engineers from EPFL. On October 12th, a composite ...

Picking up bad vibes to gauge bridge health

May 02, 2007

By monitoring changes in vibrations of bridges it is possible to identify hidden cracks and fractures, according to a Queensland University of Technology researcher.

Gravity played role in New Orleans' bridge failures

Nov 29, 2005

Sir Isaac Newton did a number on the Interstate 10 bridges in New Orleans, according to a team of researchers at the University of Missouri-Rolla that helped document some of the damage caused by Hurricane ...

Recommended for you

Using sound to picture the world in a new way

17 hours ago

Have you ever thought about using acoustics to collect data? The EAR-IT project has explored this possibility with various pioneering applications that impact on our daily lives. Monitoring traffic density ...

Sweeping air devices for greener planes

Oct 21, 2014

The large amount of jet fuel required to fly an airplane from point A to point B can have negative impacts on the environment and—as higher fuel costs contribute to rising ticket prices—a traveler's wallet. ...

User comments : 0