Regen Ground Granulated Blast furnace Slag (GGBS) is a cement substitute, manufactured from a by-product of the iron-making industry. Using one tonne of Regen in concrete reduces the embodied CO2 by around 900kg, compared to using one tonne of Portland Cement, and also increases its durability. Regen is more sustainable than other cement substitutes such as Fly Ash. In the UK, GGBS is usually supplied as a separate component for concrete and is added at the concrete mixer. It can replace 70 per cent or more of the Portland cement.
GGBS has been used in the reconstruction of the Dawlish sea wall. The contractor estimates 1,130 tonnes of CO2 have been saved as a result:
The rail line across the Dawlish sea front was washed away by a storm in February 2014. As part of the reconstruction, BAM Nuttall is building a new sea wall using Regen GGBS concrete supplied by Hanson UK. The concrete uses ground granulated blast furnace slag (GGBS) – a waste by-product of steel manufacturing – to replace a large proportion of energy-intensive cement. To date, construction of the second section of new sea wall has used 4,600 cubic metres of low carbon concrete, with around 4,500 cubic metres remaining to pour. By using Regen GGBS concrete, the Dawlish project will have reduced the amount of carbon generated by this process by two-thirds and saved over 1,130 tonnes of carbon dioxide from entering the atmosphere in comparison to traditional concrete, it has been calculated.
🏗️Delighted to be working with @BAMNuttall on using low carbon concrete as part of our construction of the Dawlish sea wall.
— South West Rail Resilience Programme (@SouthWestRRP) June 18, 2021
👷♂️ We're saving over 1,130 tonnes of carbon dioxide from entering the atmosphere compared to traditional concrete.
🔗 More info: https://t.co/5tWHUpcO5v https://t.co/Vp4xc3yzCx
