CarbonBuilt Concrete Carbon Reduction

Mineralizing CO₂ via CO₂ curing to allow replacing concrete’s cement ingredient with low-carbon, mostly waste materials

This project mineralizes CO₂ in concrete, permanently removing it from the atmosphere. That allows the reduction or elimination of concrete’s cement ingredient, which is responsible for about 7% of global emissions. CarbonBuilt replaces cement with low- or no-carbon, regionally-available industrial byproduct materials, promoting a circular economy. Their XPrize-winning technology reduces the embodied carbon of concrete products by 70 to 100% or more with no impact on price, performance, or plant operations.

CarbonBuilt retrofits existing concrete product producers with its carbon curing technology to reduce their global warming potential (GWP). Their first retrofit was in mid-2023 at an Alabama block plant to produce ultra-low carbon concrete blocks (greater than 70% GWP reduction) now available for purchase, with reductions and removals being generated and delivered. Their second plant is in Arizona. Subsequent plants around the country are in negotiation.

Revenue from carbon credits will be shared with CarbonBuilt’s historically risk-averse concrete producer partners to grow their margin post-retrofit and make a stronger financial case for accelerating adoption. 

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Project location

Technology and mechanism

Concrete Curing
Replacing the cement in concrete with low-carbon materials.
Permanence: 1000+ years
The durability of this project is extremely high as a result of the technology used. There is no associated notion of sequestration, nor any risk of reversal.

Project certifications

Patch requires all projects on the marketplace to have its methodology, project design, and outcomes verified by an approved third party. For more on our project vetting and onboarding process, review our Trust and Safety Framework.


Not applicable

Project registration date

Not applicable

Crediting period term

May 17, 2023 - May 16, 2033

Project methodology

Updated Apr 05, 2021
Verified by Ruby Canyon Environmental, Inc

Project design document (PDD)

Pending approval

Current verifier of project outcomes


Project details

Emissions reduced or carbon removed on an annual basis
150,000 tonnes
How the project approaches risk of reversal
The project is exposed to minimal reversal risk.
What actions would be taken by the project developer if anticipated emissions reductions do not take place, or if carbon removal is reversed in the future?
In the event of a potential reversal, the supplier will use credits kept on reserve in a buffer pool (10%). However, there is no practical risk of re-release.
What calculation methods are used to independently reproduce and verify the carbon impact of the project?
Please refer to Section 8 of the methodology document.
Citation: Methodology
United Nations Sustainable Development Goals
Industry, Innovation and Infrastructure
Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation
Sustainable Cities and Communities
Make cities and human settlements inclusive, safe, resilient and sustainable
Climate Action
Take urgent action to combat climate change and its impacts

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