A cooperation with the potential to advance decarbonization in the building materials industry: Swedish steelmaker SSAB and Heidelberg Materials have announced a strategic alliance to establish a circular economy for climate-neutral cement. The partnership aims to leverage synergies between steel and cement production to reduce significant CO₂ emissions from both sectors. The cement industry is globally responsible for approximately 8 percent of anthropogenic CO₂ emissions, with much of it occurring during the decarbonation of clinker in the rotary kiln.
The cooperation focuses on developing a closed material loop in which industrial by-products and residual materials from steel production are to be used as secondary raw materials in cement manufacturing. SSAB, which is already working on fossil-free steel through its HYBRIT initiative, could supply slags and iron carriers from direct reduction with hydrogen, which would serve as replacements for primary raw materials such as iron ore or sand in clinker production. Heidelberg Materials has extensive experience in the use of alternative fuels and secondary raw materials and already operates several pilot projects for CO₂ capture and storage (CCS).
However, significant questions regarding concrete implementation remain unanswered. Neither specific technologies nor a timeline for realization have been presented. It is also unclear to what extent the circular economy will be established and which production sites will be involved. For planners and architects, what is most relevant is what material-technical properties the concrete produced in this way will have and whether compliance with DIN EN 206 and the relevant Eurocodes can be guaranteed. Compressive strength classes, bulk density, and durability must meet standard requirements in order to achieve broad market acceptance.
The announcement joins a series of cooperations in the field of sustainable building materials. Similar approaches are being pursued by, for example, Etex and Heidelberg Materials in fiber cement recycling, while Wienerberger and AIT are already making progress in decarbonizing brick production. The SSAB-Heidelberg alliance could become an important building block for achieving EU climate goals, provided the collaboration delivers concrete results beyond the statement of intent. For the building materials industry, it remains to be seen when the first products with Environmental Product Declaration (EPD) and demonstrable CO₂ reduction will come to market.
