Rock shafts, which are used to transport ore, require reinforcement and are made with shaft concrete. Previously, LKAB Berg & Betong has had access to and used GGBS, a residual product from steel production, to replace part of the cement in the concrete recipe and thereby reduce the product’s carbon dioxide emissions. Now, the first large-scale test is being carried out with a completely cement-free concrete, a recipe that contains no cement at all. In this recipe, GGBS is used together with another residual product from LKAB’s own production, waste lime, which has been used for flue gas purification and is normally landfilled. Together with gray rock, which is used as an aggregate, the concrete mixture is completely circular with low carbon dioxide emissions.

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