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Invention from Purdue University could drastically improve concrete construction

By Joanie Dugan

Posted April 24, 2024

Luna Lu in a lab with concrete testing sensors

Luna Lu is the chief executive officer of Wavelogix and a professor at Purdue University. She's worked on developing this technology since late 2016. (Rebecca Robinos/Purdue University)

A concrete strength sensing system invention from Purdue University could reduce cost and time spent on concrete construction.

Wavelogix won the Edison Award in the Critical Human Infrastructure category for the REBEL Concrete Strength Sensing System. It uses sensors that are embedded into fresh concrete to measure the concrete’s strength in real time.

“The REBEL sensor is using the IoT sensor technology to replace 200 years old compression testing… It can help increase construction schedules, improve productivity, reduce costs, and more importantly, has a potential to reduce 25 percent of over design of cement usage globally,” said Luna Lu, chief executive officer at Wavelogix and Reilly Professor of Lyles School of Civil Engineering at Purdue University. “And that will translate (to) about 1 billion metric tons of the co2 output if the technology is adopted worldwide.”

The REBEL sensor is a unique invention in construction. Lu said that it’s being adopted quickly because it’s disrupting the industry and offers a lot of benefits.

Concrete strength is most often tested by casting cylinders that are then tested under compression for strength. It can take up to a month. This invention would eliminate that process, saving time, money, and resources.

“You don’t need a human there to make cylinders. You don’t need to cure cylinders. You don’t need to transport,” Lu said.

The sensor can be used anywhere there is a concrete structure. Lu said the sensors have been tested in high rise buildings, parking garages, airport runways, and dams.

“We started working on this technology in 2016, late 2016, early 2017, by partnership with the Indiana Department of Transportation,” Lu said. “It was really starting from a very specific problem to understand when it applies to traffic or opening time for any major construction…you need to understand when the concrete reaches that threshold to be able to take on a load of traffic flow.”

The Federal Highway Administration is conducting a study in 9 states (including Indiana) to implement the sensor system. A sensor was installed at the 1-465 interchange to 1-69 south in Indianapolis last year.

Wavelogix licenses the sensor from the Purdue Innovates Office of Technology Commercialization. Lu said the support she’s received from Purdue while developing this sensor has made its success possible.

The Edison Awards, named after Thomas Edison, are awarded for innovation and excellence in new product and service development. It’s also called the “Oscars of Innovation”. Wavelogix won in the Critical Human Infrastructure category.

“To me, this means not just a recognition, but also reminds me of the responsibility as a professor and engineer we have to society,” Lu said. “How can we continue to think differently? How can we redefine what’s possible, and to make a better world?”