CalPortland, Fortera mark milestone in mineralized CO2 concrete binder

Primed for duty in northern California, the Fortera Redding ReCarb Plant is the culmination of 100,000-plus hours of research and development and more than a decade of rigorous testing and real-world product demonstrations. The Net-Zero Industries Awards recently named Fortera the 2023 U.S. National Winner for Outstanding Projects. The ReAct binder is a Green Builder Media 2024 Sustainable Product of the Year.

San Jose-based Fortera Corp. has started ReAct concrete binder processing at a facility adjacent to the CalPortland Co., Redding, Calif. cement mill. The Redding ReCarb Plant is North America’s first industrial green cement and carbon dioxide mineralization facility—and one of the largest operations in the carbon capture and use class the world over. It is equipped for annual output of 15,000 tons of ReAct powder, and capture of 6,600 tons of carbon dioxide from a flue stack serving the plant’s calcining and kiln phases.

On a ton-for-ton basis compared to portland cement, Fortera measures a 70 percent reduction in carbon emissions tied to ReAct, whose main compound is a rare form of calcium carbonate. The company anticipates deliveries later this quarter—likely supersacks for starters—to concrete producers, who can use ReAct as a supplementary cementitious material in blended binders, or as a full portland cement replacement. ReAct testing and field concrete demonstration candidates include CalPortland ready mixed operations throughout California and Vulcan Materials’ Central Concrete Supply business in the Bay Area.

Ryan Gilliam

“Redding is the first of many plants in Fortera’s future as a green cement producer, and achieving this milestone brings the industry that much closer to realizing zero-carbon cement, which is critical for both our continued infrastructure and the health of our planet,” says CEO Ryan Gilliam. “While significant, we recognize this is one step in a much larger effort to reach commercialization globally, and we are committed to scaling our technology using existing infrastructure to mobilize widespread adoption of low and zero-carbon cement.”

“For 132 years, CalPortland has developed resilient and sustainable cement and concrete products. We understand the importance of using science-driven research to continue to develop new and innovative products that will have a positive impact on the future,” adds CalPortland Executive Vice President Steve Regis. “We are excited to partner with Fortera as they develop their new ReCarb technology and congratulate them on the completion of their new facility.”

ReCarb technology reduces carbon emissions throughout the value chain without imposing substantial capital costs and creates a product that is just as effective as ordinary cement, Fortera contends. ReCarb also increases overall product output: When limestone is heated in a kiln to make ordinary cement, nearly half the material volume is lost as CO2. Mineralizing those emissions through ReCarb produces a ton of green cement for every ton of limestone feedstock. Further, ReCarb reduces energy use by using a lower kiln temperature and creates a path to zero CO2 cement when processed with renewable energy-powered equipment.


The Fortera Corp. process uses calcium, oxygen and other elements to mineralize front end carbon dioxide emissions, netting a calcium carbonate compound at a reactive phase, well suited as a hydraulic binder for fine and coarse aggregate.