Low-carbon cement highway project achieves excellent results

Carbon Upcycling Technologies Inc along with, the Minnesota Department of Transportation (MnDOT) and the National Road Research Alliance (NRRA) has successfully completed the construction phase of a multi-year study on the use of low-carbon cement in highways. The results highlight Carbon Upcycling’s ability to be a drop-in solution for reducing carbon-intensive cement in concrete.

The study, managed by Sutter Engineering LLC and sponsored by the National Road Research Alliance (NRRA), rigorously tested 16 unique concrete mixtures in real-world conditions on an active Minnesota highway to identify options that could reduce the carbon footprint of infrastructure without sacrificing strength or durability. Completed in early 2024, the study aimed to find materials that could significantly lower the carbon footprint of concrete paving without compromising durability. Carbon Upcycling's CO₂-enhanced mix achieved a 12.3 per cent reduction in cement content , while matching the workability of traditional concrete, allowing seamless handling, placement, and setting times for construction crews. These findings provide valuable data to guide future low-carbon infrastructure projects across North America, as the seamless integration into existing workflows offers a drop-in, low-carbon alternative without compromising ease of use or performance. 

Carbon Upcycling’s concrete mix was also 28 per cent stronger at 28 days compared to the advanced control concrete. The mix also saw a 32 per cent increase in chloride resistivity for more durable concrete.

Carbon Upcycling partnered with BURNCO to deploy and test 140m³ of its CCU-enhanced concrete mix, monitored by Larry Sutter, Principal Engineer at Sutter Engineering LLC, for strength, workability, and environmental impact on a Minnesota highway.

“Carbon Upcycling submitted a very impressive mixture design to the trial,” said Larry Sutter, MnDOT’s Principal Engineer and the project’s technical manager. “Their material not only achieved the highest reduction in cementitious content among all submissions but also demonstrated remarkable strength. By embedding CO₂ and reducing the reliance on Portland cement, Carbon Upcycling’s technology addresses one of the concrete industry’s most pressing challenges—lowering its carbon footprint as global demand for cement is expected to double by 2050. This project data will be invaluable as the industry works toward its 2030 CO₂ reduction targets.”