No 8. February 2013

Storing Carbon in Concrete with Eco-cements

Cement making produces about 9 per cent of global carbon emissions, while eco cement is said to be the cheapest form of carbon sequestration, and would allow carbon to be stored in the built environment in the great number and variety of concrete and cement structures. This is a view shared by John Harrison, the founder of TecEco Pty Ltd, which has been commercializing a range of eco-cements since 1999.

TecEco's international patents are for cements where the normal Portland Cement is replaced with reactive magnesia, which is also known as caustic calcined magnesia or caustic magnesia. TecEco has three basic types of cements.

Eco-cements have a high proportion of magnesia, which carbonates and adds strength and durability. It is used for bricks, blocks, pavers, slabs, paths, render and other permeable cement products.

Enviro-cements also have a large proportion of magnesia, which reacts to form bucite, a mineral that can trap toxic and hazardous wastes.

Tec-cements are a blend of Portland Cement and a small proportion of magnesia plus high proportions of other cementitious materials which react with or are activated by the Portland Cement. Tec-cement is a very durable and high strength for demanding construction applications.

Tec-Eco is also commercializing a Tec-Kiln that can produce concrete using the Tec, Eco and Enviro cements at low temperature.

Mr Harrison says his products suit a market that is insatiable for cheaper and better building materials.

A pallet of eco-cement blocks.

Tec-Eco's commercialization strategy for its cements is to network with major and smaller companies in the industry to implement exemplar projects, and with third parties where TecEco can potentially provide offsets.

Tec-Eco is also raising capital and the investment opportunity suits corporates and financiers as well as high net worth and sophisticated investors.

Mr Harrison is an accountant, economist, geochemist, horticulturalist and materials scientist. His eco-cement won a heat on the ABC's New Inventors program and was one of the final five for the people's choice.

 

 

 



 





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