Green cement soaks up CO2
Cement based on silicates and carbonates could reduce the carbon footprint of the contruction industry
Novacem, a spin-out company from Imperial College London's Incubator sector, has developed a 'green' cement that uses less energy to make than conventional Portland cement and absorbs a net amount of carbon dioxide, so potentially reducing the carbon footprint of the construction industry.
Conventional Portland cement used by the construction industry worldwide uses 3-4 gigajoules of energy per tonne manufactured, and releases between 650 and 800 kilograms of CO2. Every year more than 2.5 billion tonnes of Portland cement are produced with this number expected to increase to five billion tonnes per year by 2030.
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