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Concrete blocks with less cement have already left the experimental phase and have begun to be commercially manufactured in the United States, using a technology that uses repurposed industrial waste to reduce emissions without changing the basic function of the material in construction.
CarbonBuilt has started commercial production of low-carbon concrete blocks and masonry products in Danielson, Connecticut, using Reversa, a proprietary binder that replaces up to 50% of traditional cement with repurposed industrial materials.
Announced by the company on December 2, 2025, the operation marks the industrial expansion of a technology created to reduce emissions without altering the basic use of blocks in civil construction.
At the heart of the innovation is Portland cement, a component associated with high emissions due to the industrial process of clinker production, an essential step in manufacturing the material used on a large scale in construction.
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Instead of proposing a complete change to the construction system, CarbonBuilt claims its technology works within factories, modifying the composition of the blocks before they reach the construction site.
How low-carbon concrete works
According to the company, Reversa is primarily composed of recycled industrial by-products and was developed to enter the production process as a partial alternative to the cement used in conventional block manufacturing.
The solution caters to concrete masonry blocks and hardscapes, a category that includes pieces used in outdoor areas, paving, and other similar elements used in construction and light infrastructure projects.
With the change in formulation, the proposal is to reduce the carbon embedded in the product without requiring builders, architects, and masons to change the appearance or application of the blocks.
CarbonBuilt states that its process can cut up to 70% of the carbon footprint of concrete products compared to conventional manufacturing, maintaining cost, performance, and quality within commercial parameters.
Factory in Connecticut brings technology to market
In Connecticut, production takes place at CarbonBuilt’s first fully-owned factory, located in Danielson, a city where the company has started operating a unit aimed at the regional concrete market.
Before receiving the CarbonBuilt brand, the unit was the former Jolley Concrete plant, acquired by the company in 2025 after investments in operational efficiency, product quality, reduction of cement use, and waste reduction.
With this industrial structure, the company claims that the factory has the capacity to produce more than 80 thousand tons of concrete per year, a volume that puts the technology on a commercial scale.
The operation plan also includes segmented retaining wall products and low-carbon architectural masonry, in addition to concrete units already destined for the Northeast United States market.
Unlike materials that try to attract attention through appearance, these blocks maintain a visual similar to traditional concrete, while the most significant change appears in the industrial recipe used to manufacture them.
In construction, the block retains its known function in walls, fences, buildings, schools, warehouses, and public structures, but arrives at the site with less dependence on common cement in its composition.
Less cement without changing the use in construction
This strategy helps explain why the company presents the technology as a practical adoption alternative, rather than a break with conventional construction.
In civil construction, technical standards, predictability, known suppliers, and cost control weigh on purchasing decisions, favoring solutions that can fit into existing production chains.
Although it remains essential for concrete on a global scale, cement concentrates an important part of the emissions associated with the material and has become a direct target of technologies aimed at decarbonization.
By reducing the amount of cement in each block, CarbonBuilt tries to act on a component repeated millions of times in constructions, multiplying the environmental effect in seemingly simple products.
According to the company, Reversa can be integrated into the industrial infrastructure already used in concrete manufacturing, without relying solely on new factories or completely different equipment.
This fit is relevant because new technologies usually face resistance when they require profound changes in the routine of manufacturers, designers, builders, and professionals responsible for executing the works.
Academic origin and circular economy
The trajectory of CarbonBuilt began in academic research linked to the Institute for Carbon Management, at the University of California in Los Angeles, before advancing to the commercial phase.
In 2021, the company gained visibility by receiving the Carbon XPRIZE, an award aimed at technologies capable of transforming carbon dioxide into useful products for different industrial sectors.
Despite the environmental appeal, the current commercial proposal does not rely solely on the sustainable discourse, as CarbonBuilt claims to seek competitiveness in price, performance, and quality.
These criteria are decisive for materials used by engineers, construction companies, suppliers, and institutional buyers, especially in projects that require strength, durability, and technical compliance.
By using industrial waste and by-products as part of the binder formulation, the technology also brings the construction industry closer to the concept of circular economy.
Materials that might have lower industrial value become part of a basic construction item, with application in everyday concrete products and potential for large-scale repetition.
Blocks are already sold for real projects in the USA
In the United States, the arrival of commercial production in Danielson places CarbonBuilt at a different stage from projects restricted to laboratories or occasional demonstrations.
The blocks are already presented as products available to the market, focusing on concrete masonry and pieces intended for real projects in the American Northeast.
For the end consumer, the change may go unnoticed at first glance, because the block remains gray, heavy, and similar to traditional models found in conventional construction.
Behind this common appearance, the composition contains less cement and more recycled material, shifting the innovation to a stage prior to construction and less visible to the public.
Adoption on a broader scale still depends on acceptance by construction companies, regional availability, the technical requirements of each project, and the rules applicable to construction materials.
Even so, the commercial advancement of CarbonBuilt shows that emission reduction in concrete has already entered the manufacturing and sales phase, not just an experimental promise.
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