Concrete That Repairs Itself- What's Next?

Scientists are now working on concrete that “heals itself. “ This could greatly reduce the cost of maintain critical aspects of infrastructure. 

This is the result of research involving polymers underway at the Department of Energy’s Pacific Northwest National Laboratory.

The researchers are developing a self-healing cement for use in harsh environments where cement can fail over time due to exposure to chemical and physical stresses. When cement in power plants, geothermal wells, oil and gas applications, or hydroelectric dams fails, it can lead to expensive excavation, repair and replacement costs, along with lost production time and revenue, and potential environmental concerns.

 Funded by the DOE’s Geothermal Technology Office, scientists have been able to create self-healing cements by adding polymers to traditional cement mixes. The resulting cement has re-adhering properties that extend its lifetime and reduce the risk of failure.

The scientists discovered that by adding a small amount of polymers to a typical cement before it is poured and cured, the cement can repair itself within 24 hours of a crack forming.

Early results are promising. For example, in a laboratory test of one of their custom-made polymer- modified cements, scientists showed that they could reduce the permeability of fractures in cement casings by more than 80 percent compared to cement typically used in geothermal wells.

Researchers also are studying the cement’s potential to re-adhere to the underground steel pipes used to pump oil and gas to the rock surrounding the pipes, helping them remain bonded and protecting even further against potential cracks and leaks.

As the cost for maintaining infrastructure increases, new innovations such as self-healing cement are great examples of how scientific research can make the seemingly impossible, possible. It also illustrates how a solution developed for one purpose may one day pave the way for a much broader application, such as better sidewalks and roadways.

Converse Consultants provides  geotechnical engineering services as well as materials testing and construction inspection services in support of existing and new infrastructure design and construction efforts.  Our geotechnical laboratories are certified by DSA, AASHTO, Caltrans, CCRL, and other relevant state and local agencies.  For more information about our services, visit our website:  www.converseconsultants.com.