Commonly known as 'GGBS'

Regen is Ground Granulated Blast furnace Slag, commonly known as ‘GGBS’.

It 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 850kg, compared to using one tonne of Portland Cement. It also increases the concrete’s durability and is more sustainable than other cement substitutes such as Fly Ash.

Regen is manufactured by Hanson Cement, which acquired Civil & Marine in 2006. Regen from Hanson Cement is the only GGBS manufactured in the UK.

Principal Oxides

  CaO SiO2 Al2O3 MgO Fe2O3
Regen 40% 35% 12% 10% 0.2%
Portland Cement 65% 20% 5% 1% 2%


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