32 THE CLIMATE CHALLENGE
THE CEMENT 2 ZERO PROJECT IS AN INVALUABLE OPPORTUNITY TO COLLABORATE ACROSS THE ENTIRE CONSTRUCTION SUPPLY CHAIN
Philippa Horton, invented a process that converts construction and demolition waste to cement over molten steel, using an EAF used to recycle scrap steel. The Cement 2 Zero project aims to demonstrate that concrete can be recycled to create a Slag Forming addition which could, when cooled rapidly, replace Portland cement.
Dr Dunant has discovered that the chemical composition of used cement is virtually identical to that of the lime- flux used in the conventional A steel recycling process. Traditional Portland clinker, one of the main ingredients in cement, is produced by firing limestone and other minerals in a kiln at extremely high temperatures
(1,450°C), which is the process accounting for more than 50% of the cement sectors’ emissions.
By contrast, Cement 2 Zero will use recycled cement as the flux in the electric steel recycling process (EAF powered by renewables), the by-product of which, when cooled and ground, produces Portland cement clinker, which is then blended to make ‘zero-emissions’ cement. Therefore, this innovative cement product (CEC) could be made in a virtuous recycling loop, that not only eliminates the significant emissions of cement and steel production, but also saves raw materials.
It is a project that aims to be
transformational for the cement and steel industries, creating a zero-emission supply chain from demolition to construction. So, when it comes to housebuilding, CEC represents a huge opportunity to massively reduce the impact of our industry. And when you combine this with the lower carbon steel technology which is also enabled by this trial, there is a real sense that we’re well on our way to real net-zero homes.
Will Lavelle is Atkins’ embodied carbon lead & Dr Philippa Horton is Use Less group business manager at University of Cambridge
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