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Although there is no precise definition, low energy, low carbon cements would generally be understood to have some or all of the following characteristics:

They are manufactured using a process that, ideally utilizes waste derived fuels and raw materials;
They embody less energy than ‘traditional’ Portland cements, including those that contain additional inorganic/mineral constituents;
They are expected to reduce both waste and emissions.

Three specific types, either already in production or under investigation and that can fulfill the above characteristics are :

Eco-cement' based on magnesium oxide (Tasmania);
Low energy CSA-belite cements (China);
Eco-cement' based on municipal solid waste incinerator ash (Japan).

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