New Concrete Shielding Can Protect Structures from EPM
AZOBUILD / November 15, 2016
Nebraska engineers Christopher Tuan (left) and Lim Nguyen have developed a costeffective concrete that shields against damaging electromagnetic energy. Electronics inside structures built or coated with this concrete are protected from electromagnetic interference. The university has signed an agreement to license this shielding technology to a Florida company. Tuan and Nguyen are standing beside a test structure at Nebraska’s Peter Kiewit Institute in Omaha.
An attack made through a burst of electromagnetic energy could render crucial electronic systems ineffective, jeopardizing national security and important infrastructure such as data centers and power grids.
Christopher Tuan and Lim Nguyen, two engineers from Nebraska, have developed an inexpensive concrete that is capable of shielding against strong pulses of electromagnetic energy, or EMP. Electronics inside structures coated or built with this shielding concrete are not prone to EMP.
The concrete is ready to be commercialized; American Business Continuity Group LLC, a company that develops disasterresistant structures, has signed an agreement to procure the license to this shielding concrete.
Electromagnetic energy is present everywhere. The energy travels in the form of waves, and spans a broad spectrum from sunlight, radio waves and microwaves to gamma waves and Xrays. However, an EMP or a highaltitude nuclear explosion can cause a burst of electromagnetic waves, inducing voltage or electric current surges that can result in widespread electronic failure.
Tuan and Nguyen’s collaboration to explore concrete that has the capacity to conduct electricity gave birth to EMPshielding concrete. The engineers initially developed the patented conductive concrete with the intent of melting ice and snow from surfaces, such as bridges and roadways. They also found and confirmed that the concrete has one other significant property; it could block electromagnetic energy.
The technology operates by absorbing as well as reflecting electromagnetic waves. The engineers used their main ingredient magnetite, a mineral that has magnetic properties and can absorb microwaves like a sponge, to replace some regular concrete aggregates. The recipe of shielding concrete includes metal components and carbon for better absorption and reflection. Thanks to this ability to both absorb as well as reflect electromagnetic waves, the shielding concrete is much more effective than other shielding technologies of the day.
The technology is also more flexible and costeffective than other existing shielding methods, said Tuan. The current shielding technologies make use of metal enclosures that need costly metal panel or screen construction that limit their feasibility in huge structures.
The Nebraska team entered into a research agreement with ABC Group, and modified their shielding concrete to work with the shotcrete construction technique of the company. The end product is yet to be patented, and can protect structure interiors from electromagnetic interference like microwaves, radio waves and electronic eavesdropping. The material can be used to protect financial, military and other structures that store valuable electronics, such as aircraft or data servers.
Shotcrete is a sprayon technique of applying concrete, which can be employed to costeffectively retrofit existing buildings, an important benefit for protecting important military installation and infrastructure, said Tuan.
A prototype structure was built by the ABC Group recently at its disaster recovery complex in Lakeland, Florida, to demonstrate the effectiveness of the technology. The structure exceeded military shielding needs.
“The concrete has the ability to provide what we call a multithreat structure," said Nguyen, professor of electrical and computer engineering, who traveled to Florida to assess the prototype structure. "The structure has to be able to withstand an attack either by an explosive or an electromagnetic attack or other scheme."
Mauricio Suarez, director of licensing at the university's nonprofit technology commercialization affiliate, NUtech Ventures, stated that as per the licensing agreement the exclusive rights to sell the shielding shotcrete product is with ABC Group, whose EMSSElectromagnetic Shielding Shotcrete is commercially available now.
Engineers Tuan and Nguyen are investigating further uses for the conductive concrete, including antistatic flooring applications, and enhancing deicing and radiant heating. NUtech Ventures is assisting the engineers in applying for patents and navigating further potential licensing agreements, as new formulations increase.