Paebbl secures €4 million grant to pioneer carbon‑negative concrete using magnesium‑based binder

Paebbl has won a €4 million grant from the European Innovation Council’s Pathfinder programme to accelerate development of a magnesium‑based binder intended to turn concrete from a net emitter into a durable carbon sink, according to Carbon Herald and the company’s announcements.

The project targets clinker, the carbon‑intensive ingredient at the heart of cement production, by using magnesium silicate minerals that permanently lock CO2 into solid carbonate through accelerated mineral carbonation. Paebbl and its consortium partners say the resulting materials can act as supplementary cementitious materials or partial cement replacements without sacrificing strength or durability, making them compatible with existing precast and ready‑mix applications.

Industry partners in the consortium include precast group Consolis and building‑materials heavyweight Holcim, with academic contributors Delft University of Technology and KU Leuven. The collaboration emphasises industrial relevance from the outset, pairing laboratory chemistry with scale‑up pathways and deployment in real production environments. Paebbl also plans to apply machine learning and advanced simulation tools to speed both the mineral‑formation kinetics and the design of low‑carbon concrete mixes tailored to practical use.

Independent reporting and the company’s own materials reveal more about feedstocks and process conditions. Paebbl’s approach uses olivine, a magnesium‑iron silicate mined near Åheim in Norway, and combines the crushed mineral with CO2 under controlled pressure and temperature, with renewable energy providing the process heat and power. The company claims it has accelerated natural mineral carbonation by up to 10 million times and moved from gram‑scale work to tons‑per‑day production within 36 months. Early demonstration activity includes a continuous mineralisation plant in Rotterdam described by Paebbl as the largest facility dedicated to continuous CO2 mineralisation for construction materials.

The project sits alongside private capital supporting scale‑up. Holcim and Amazon’s Climate Pledge Fund were reported to have co‑invested in Paebbl as part of a US$25 million Series A round led by Capnamic, funds the company says will be deployed to commercialise its process. Paebbl has stated ambitions to move from demonstration to a first‑of‑a‑kind commercial plant by 2027 or 2028.

Advocates frame the technology as part of Brussels’ strategy to decarbonise “hard‑to‑abate” sectors with deep tech rather than incremental efficiency gains. Industry commentary suggests the approach could materially reduce embodied carbon in concrete: Euronews and others have reported potential emissions reductions of up to 70% in some mixes, while noting that broader impact will depend on feedstock sourcing, energy inputs and the ability to scale manufacturing across concrete classes.

Caveats remain. Mineral carbonation routes hinge on the availability and lifecycle impacts of magnesium‑rich feedstock, the carbon intensity of process energy, and integration with existing cement and concrete value chains. Scaling from demonstration to industrial throughput will require mining and logistics for olivine or other silicates, long‑term supply agreements, and verification frameworks to ensure CO2 is permanently stored and accounted under regulations and corporate reporting standards. Industry data shows the construction sector in Europe employs some 18 million people and contributes around 9% of the bloc’s GDP, while producing roughly 250 million tonnes of CO2 per year, underlining why the sector is a central focus for decarbonisation policy.

For the construction sector and its customers, the technology signals a shift in how climate compliance may be achieved: not merely by lowering emissions intensity but by embedding carbon removal into building materials themselves. According to Paebbl and reporting on its work, success would enable builders to specify materials that both meet structural requirements and carry a net‑negative carbon profile, potentially altering procurement, standards and lifecycle assessments across the industry.

The EIC Pathfinder grant will support continued research and scale‑up efforts, with partners aiming to validate performance across multiple concrete classes, refine process energy and material balances, and prepare for commercial deployment. If Paebbl and its consortium deliver at scale, the outcome could make the built environment a significant locus of carbon removal as well as emissions reduction, though widespread adoption will depend on demonstrable performance, transparent carbon accounting and the economics of competing low‑carbon binders and cements.