Carbonaide Raises EUR 1.8M to Make Manufacturing Concrete Carbon Negative

Carbonaide, a spin-out company from VTT Technical Research Centre of Finland that enables the manufacturing of carbon-negative concrete, has raised EUR 1.8 million in seed funding led by Lakan Betoni and Vantaa Energy. The round was completed with public loans and in-kind contributions from Business Finland and other Finnish concrete companies and strategic investors.

The company will use the funding to integrate its CO2 curing technology into an automated production line of its precast concrete factory in Hollola, Finland. With its factory-sized pilot unit and fully operational value chain, Carbonaide can mineralize up to five tons of CO2 per day and increase production by 100-fold of its carbon-negative concrete products.

The concrete industry is responsible for 8% of global CO2 emissions, with most of the emissions originating from ordinary Portland cement manufacturing: One ton of ordinary Portland cement creates 800–900 kg of CO2 emissions. With legislation increasingly tightening around construction material emissions, industrially feasible technologies to reduce the CO2 emissions of concrete are desperately needed.

Carbonaide’s solution is based on an effective carbonation method, which binds carbon dioxide into precast concrete using an automated system at atmospheric pressure. The technology can halve the CO2 emissions of traditional Portland cement concrete by reducing the required cement content and mineralizing CO2 into concrete. 

When industrial side streams--such as industry slags, green liquor dregs, and bio-ash--are used in the binding process instead of normal cement, the result is concrete with a negative carbon footprint. In the process, CO2 is permanently stored and removed from the carbon cycle. 

“We have demonstrated in the pilot unit that our technology is capable of reducing the CO2 emissions of conventional concrete by 45%," said Tapio Vehmas, CEO of Carbonaide. "Last autumn, we demonstrated lowering our products’ carbon footprint to -60 kg/cu m by replacing Portland cement with slag. Our first pilot unit had limited capacity, so we’re grateful to our investors for the chance to upscale our technology to a factory-sized pilot and demonstrate the technology full-scale.

“Our goal at Carbonaide is to create a more sustainable future with cutting-edge tech that doesn’t just reduce the carbon emissions of construction materials like concrete, but that traps more CO2 than they emit throughout their lifetime. It is very natural that the constructed environment becomes a CO2 sink as it is the largest volume of man-made material,” said Vehmas.

With governments introducing taxes, emission trading mechanisms, and renewable energy targets, and consumers willing to pay a premium for low-carbon products, material producers and construction companies have recognized the need to comply with the new market situation.

“As new innovations take ground, the demand for low-carbon products will likely increase," said Juho Hiltunen, CEO of Lakan Betoni Oy, one of the concrete companies that invested in Carbonaide. "New technologies, such as Carbonaide, provide the means for the industrial-scale production of affordable low-carbon products. We’re happy to support Carbonaide scale up its production and realize the world’s first CO2 curing integration to a fully automated precast concrete production line.”

“Avoiding carbon dioxide emissions should always be the primary mechanism to foster biodiversity. However, carbon capture and permanent storage of unavoidable CO2 emissions are needed to enable a sustainable carbon cycle (e.g. in the Waste-to-Energy sector). Carbonaide technology is an excellent example of how to both reduce and utilize existing CO2 in new products and permanently store carbon from the cycle," said Matti Wallin, business director from Vantaa Energy Ltd, one of Carbonaide's strategic investors.