Finnish researchers win award for carbon-negative precast concrete

Carbonaide paving blocks have already been used at one of Skanska’s construction projects this autumn (Courtesy of VTT)
A team of Finnish scientists has won a European innovation award for making carbon-negative precast concrete.

Their system uses CO2 gas which mineralises as carbonate during the curing process, eliminating the need for energy-intensive Portland cement as a binder.

Developed by Finland’s national research institute VTT, the so-called Carbonaide system won first prize in the “expected impact” category of the European Research and Technology Organisations’ Innovation Awards on 12 October.

Swedish contractor Skanska used Carbonaide yard-paving blocks at one of its construction sites this autumn.

VTT is now commercialising Carbonaide to try and get a share of the $370bn-a-year global concrete products and elements market.

VTT senior scientist Tapio Vehmas reviews the operations of the Carbonaide production unit in Hollola, September 2022 (Courtesy of VTT)

It wants to have 100 production units installed around the world by the end of this decade and to be binding 500 megatons of CO2 a year by 2050. It aims to get CO2 from existing emissions trading platforms.

“The method is compatible with the current manufacturing processes of concrete,” said Tapio Vehmas, VTT senior scientist and leader of the Carbonaide team.

“It can be used for manufacturing all precast concrete elements and products,” he added.

VTT said that when industrial wastes like steel slag and bio-ash are used in the process instead of normal cement, the concrete’s carbon footprint plunges to -60kg per cubic metre of concrete. The carbon footprint of conventional concrete is approximately 250–300kg per cubic metre.

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