A London-based start-up company which has developed cement that absorbs carbon dioxide (CO2), has raised funds to accelerate and develop production and commercialisation of their environmentally friendly cement.
It is estimated that common Portland cement, with annual production of around 2.5 billion tonnes, contributes around 5% of global CO2 emissions. However this new ‘carbon negative’ cement, on the other hand, absorbs CO2through its lifespan.
By replacing calcium carbonate, or limestone, with magnesium silicates, the cement requires less than half of the 1500°C needed in the processing of Portland cement and it is estimated that per tonne of cement, 1.1 tonnes of CO2 could be captured and stored indefinitely in construction products.
This translates to an overall negative carbon footprint of between 0.6 and 0.7 tonnes of CO2 per tonne used, compared to a positive footprint of 0.4 tonnes for regular cement.
The company has attracted investment from a number of sources and will use this to expand its team and complete a pilot plant by the end of 2009.
Posted under Environmental Technologies and Renewable Energy, Construction and Environmental Technologies on 7 August 2009