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Cement makes about 8% of the world's CO₂. CO₂ curing locks some of it back into precast concrete as stone, and makes the concrete stronger as it does.
One answer does not just reduce emissions: it actively removes CO₂ from the atmosphere while strengthening the concrete and reducing cost.
CO₂ curing technology reimagines how we approach concrete production by treating carbon dioxide as a valuable resource rather than a waste product. The process involves injecting captured CO₂ into fresh concrete during mixing or curing, where it mineralises to form stable calcium carbonate crystals that become permanently embedded in the concrete matrix.
The technology operates through a sophisticated but surprisingly simple process. CO₂ is captured from industrial sources, compressed and transported to precast facilities where it is injected into concrete during production. Once injected, it reacts with calcium ions from the cement to form nano-sized calcium carbonate minerals, which enhance the concrete's strength while permanently sequestering the carbon.
Carbonaide's curing technology has been running commercially in Finland since early 2024, and in 2025 Elematic brought it onto its own wall and circulation lines as the first commercial CO₂ cured precast system. Their collaboration demonstrates that the technology has moved beyond the experimental phase into practical, profit generating application.
The two companies put the technology at up to 20% less cement, up to 25% less curing time, and around half the CO₂ of ordinary Portland cement concrete. It operates at atmospheric pressure using an automated system, which makes it both technically feasible and economically attractive for precast manufacturers.
The economic benefits extend well beyond environmental compliance, creating revenue streams and cost reductions that strengthen the bottom line. Analysis of commercial implementations reveals cost advantages across all the major production categories.
Material cost savings are the most significant, with cement requirements reduced by up to 20% through CO₂ mineralisation. That directly addresses one of the industry's most pressing challenges, as cement costs have more than doubled in recent years. Curing time falls by up to 25%, because the mineralisation does work that steam curing used to do.
Perhaps most importantly for Irish contractors, CO₂ compliance costs turn from a liability into a revenue generator. While traditional concrete faces increasing carbon tax burdens, CO₂ cured concrete can achieve negative compliance costs through carbon credits and regulatory incentives.
The environmental benefits represent a shift in how construction affects the climate. Rather than simply reducing emissions, this technology turns concrete structures into permanent carbon storage.
Research demonstrates that CO₂ curing can achieve up to a 50% reduction in concrete related emissions while permanently storing significant quantities of atmospheric CO₂. The mineralisation process sequesters carbon for hundreds of thousands of years, because the CO₂ becomes part of the crystalline structure of calcium carbonate minerals.
The scale of the potential impact is substantial. By 2030, widespread adoption could reduce annual CO₂ emissions by 12 million tonnes globally, equivalent to removing approximately 2.6 million cars from the roads.
Beyond the environmental and economic case, CO₂ curing delivers measurable improvements in concrete performance. The mineralisation process creates denser, more durable concrete with enhanced mechanical properties.
Compressive strength improvements of 20% are typical, and some applications achieve more. The nano-scale calcium carbonate crystals act as nucleation sites for cement hydration, accelerating strength development and improving long term durability.
As the Irish construction industry navigates tightening environmental regulation and cost pressure, CO₂ curing offers a clear route to competitive advantage. The companies that adopt it now will set tomorrow's standards, delivering projects that are more sustainable, more profitable and higher performing at the same time.
At PETRUF Consulting Engineers, we are ready to lead Ireland's precast concrete industry into the carbon negative future.
Precast concrete offers efficiency, quality control and design flexibility that casting in place cannot match. Elements are cast in controlled factory conditions, cured to strength, and delivered to site for rapid assembly.
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