Conductive concrete composition
Conventional concrete is a good electrical insulator. However, specific applications drive the need for conductive properties in concrete. This innovation offers a unique combination of high mechanical strength and conductivity. Furthermore, the innovative production method described is suitable for large-scale commercial production. Conductive concrete is suitable for electromagnetic shielding, for electrical systems and component protection. The developed conductive concrete uses carbonaceous particles as a conductive phase to achieve concrete with resistivity as low as 2 Ωcm and compressive strengths over 30 MPa (both measured at 28 days).
This technology is available for licensing, or for further development through a collaborative research agreement with NRC. The business opportunity may be referred to by its NRC ID # 11052.
This innovation can be used to develop effective concrete products for applications spanning electromagnetic shielding, anti-static flooring, corrosion protection of steel reinforcements, heating and radiant indoor heating.
How it works
Conventional concrete, consisting of hydrated Portland cement with silica sand as fine aggregate and limestone, stone or other coarse aggregate, is a good electrical insulator. The electrical resistivity of conventional concrete usually ranges from about 6.54 to 11.4 X 105 Ωcm for dried concrete and about 2.5 to 4.5 X 103 Ωcm for moist concrete (conductors such as metals have resistivities in the order of 10-5 Ωcm.
For some end uses, it is desirable to have concrete that is a conductor rather than an insulator. For example, conductive concrete is useful for electromagnetic shielding. It is often required in the design and construction of facilities and equipment to protect electrical systems or electronic components from the unwanted electromagnetic energy. Other applications include anti-static flooring in the electronic instrumentation industry and in hospitals, and corrosion protection of steel reinforcement in concrete structures. Furthermore, conductive concrete can be used for heating, such as radiant indoor heating.
Unlike other conductive concrete compositions that represent a compromise between high mechanical strength and conductivity, the method and mixture in this innovation offers a conductive concrete composition combining good mechanical strength and high electrical conductivity, suitable for commercial large-scale application.
Both methods for making conductive concrete and a composition of the conductive concrete are patented. The method is particularly suited to the large-scale commercial production of conductive concrete, using industrial scale mixers.
The method and conductive concrete composition in this particular innovation offer a unique combination of conductivity and high mechanical strength. Furthermore, the production method is especially suitable for large-scale commercial production.
NRC file 11052: https://www.google.com/patents/CA2404513C
Patent issued in Canada, the US and Europe.
Tony Jenkins, Portfolio Business Advisor
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