--- title: The role of concrete manufacturers in scaling durable carbon removal date: 2026-11-04T06:00:00Z modified: 2026-10-14T06:57:00Z permalink: "https://carbonaide.com/knowledge-base/the-role-of-concrete-manufacturers-in-scaling-durable-carbon-removal/" type: post status: publish excerpt: Concrete manufacturers can permanently mineralize CO2 into precast products, generating durable carbon removal credits. Here is how. wpid: 11824 categories: - Knowledge base language: - English timestamp: 2026-10-14T06:57:00Z tags: - Knowledge base - English --- Concrete manufacturers play a direct role in scaling durable carbon removal by permanently mineralizing CO₂ into precast concrete products during the curing process. Unlike temporary carbon storage methods, this approach locks carbon into stable carbonate minerals within the concrete structure, where it remains for the lifetime of the building and beyond. The questions below unpack how this works, why durability matters, and what it means for concrete producers in practice. ## How does concrete permanently store carbon dioxide? Concrete permanently stores carbon dioxide through a process called CO₂ mineralisation, where carbon dioxide reacts with calcium ions in the cement to form stable carbonate minerals. These carbonates become part of the concrete’s physical structure and do not release CO₂ back into the atmosphere, even if the concrete is later demolished or recycled. The storage is permanent on any meaningful timescale, exceeding one thousand years. The chemistry behind this is straightforward. During carbon dioxide curing, CO₂ is introduced into a gas-tight curing chamber at controlled concentrations. The gas dissolves into the pore water of fresh concrete, where it reacts with calcium-bearing compounds in the cement paste. The result is calcium carbonate, a stable mineral that densifies the concrete’s microstructure as it forms. This is different from natural carbonation, which happens slowly over decades on the surface of hardened concrete. In a controlled curing environment, the process is accelerated and reaches deeper into the concrete mass, storing significantly more carbon in a much shorter time. The CO₂ is no longer a gas: it has become stone. ## What makes carbon removal ‘durable’ and why does it matter? Carbon removal is considered durable when the stored CO₂ cannot re-enter the atmosphere for at least one thousand years. Durability matters because temporary storage, such as in forests or soils, carries the risk of reversal through fire, decay, or land-use change. Durable carbon removal provides a credible, verifiable contribution to net-zero goals rather than a delayed emission. In the context of carbon markets and corporate climate commitments, the distinction between temporary and durable carbon removal is becoming increasingly important. Regulators, buyers, and certification bodies are applying stricter standards to what counts as genuine carbon removal. Concrete-based CO₂ mineralisation meets the highest durability criteria because the carbonates formed during curing are chemically stable and physically locked within the material. For concrete manufacturers, this has a practical consequence. The carbon stored in their products can be independently verified and certified as durable carbon dioxide removal credits, or CDR credits. This places precast concrete production in a category alongside geological storage methods, well above the durability standards of most nature-based approaches. Certification under recognised frameworks, such as Isometric’s module for CO₂ storage via carbonation in the built environment, confirms that the stored carbon meets additionality, permanence, and quantification requirements. ## How can concrete manufacturers reduce their CO2 emissions by up to 50%? Concrete manufacturers can achieve significant CO₂ emission reductions by combining two mechanisms during carbon dioxide curing: reducing the amount of Portland cement required in the concrete mix, and permanently mineralising CO₂ into the product. Together, these approaches can cut the carbon footprint of precast concrete production considerably compared to conventional methods. ### Reducing cement content through CO₂ curing Portland cement is the primary source of emissions in concrete production. Carbon dioxide curing accelerates strength development and densifies the concrete microstructure, which means producers can use less cement while still meeting product performance requirements. Depending on the product type and mix design, cement content can be reduced by replacing a portion with supplementary cementitious materials (SCMs) such as slag or limestone filler, which carry a lower carbon footprint per tonne than clinker-based cement. ### Permanent CO₂ mineralisation as negative emissions The second mechanism adds negative emissions on top of the cement reduction. CO₂ that is mineralised into the concrete is counted as removed from the atmosphere, reducing the product’s calculated carbon footprint further. When industrial byproducts such as steel slag are used as SCMs alongside carbon dioxide curing, the combination can produce concrete with a net-negative carbon footprint: the concrete absorbs more CO₂ than its production releases. The balance between these two mechanisms can be adjusted depending on production priorities. Some manufacturers will prioritise maximum carbon storage for CDR credit generation, while others will focus on cement savings and production speed. A well-designed carbon dioxide curing system allows producers to optimise for both simultaneously. ## What role do concrete manufacturers play in the carbon credit market? Concrete manufacturers that use CO₂ mineralisation can generate and sell durable carbon dioxide removal credits based on the verified amount of CO₂ permanently stored in their products. This positions them as active participants in voluntary carbon markets, where demand for high-integrity, durable CDR credits is growing as corporate buyers move away from lower-quality offset options. The role is significant because concrete production operates at scale. A single precast concrete facility running carbon dioxide curing continuously can mineralise meaningful volumes of CO₂ per year. Aggregated across multiple facilities, this creates a supply of certified durable CDR credits that is traceable to specific products and production batches. For the credits to be credible, the stored CO₂ must be accurately quantified, independently verified, and certified under a recognised standard. This requires precise measurement of CO₂ flow during the curing process, laboratory-confirmed control samples, and documentation that links stored carbon to specific product types and production runs. The Carbonaide Service Platform handles this data management, from real-time CO₂ flow monitoring to full carbon storage documentation for certification purposes. Manufacturers can use the stored carbon in two ways: as a reduction in the environmental product declaration (EPD) of the concrete product itself, or as CDR credits sold to third-party buyers in the voluntary carbon market. Both options have commercial value, and the choice depends on whether the manufacturer’s primary goal is product differentiation or carbon credit revenue. ## Which types of concrete products are best suited for CO2 curing? Precast concrete products manufactured in controlled factory environments with separate curing chambers are the best candidates for CO₂ curing. This includes wall elements, pavement slabs, blocks, pipes, and other infrastructure products that go through a defined curing phase before leaving the factory. The controlled environment is what makes high mineralisation rates achievable and measurable. Products with relatively lower cement content or those that use SCMs as partial cement replacements tend to benefit most from CO₂ curing. The process activates certain otherwise passive materials, such as gamma-dicalcium silicate found in some steel slags, enabling them to contribute to strength development in ways that are not possible with conventional curing. This expands the range of binder options available to producers and can improve both the economics and the environmental profile of the product. Lightweight concrete elements are another area where carbon dioxide curing delivers clear practical benefits. These products typically require excess cement to achieve adequate early-age strength for demoulding. CO₂ curing accelerates early strength development, which reduces that excess cement requirement and shortens the time before elements can be moved through the production line. Ready-mix concrete and cast-in-place applications are not well suited to this approach because the curing environment cannot be controlled in the same way. The technology is specifically designed for factory-based precast production where curing chambers can be sealed and CO₂ concentrations managed with precision. ## How does CO2 curing technology integrate into existing concrete factories? CO₂ curing technology integrates into existing precast concrete factories by retrofitting the existing curing chambers to be gas-tight and connecting them to a CO₂ supply and process control system. No fundamental changes to the production line or concrete mix design are required at the outset, which makes adoption practical for producers with established facilities. The integration involves three main components. First, the curing chambers are modified to allow controlled CO₂ concentrations to be maintained during the curing cycle. Second, a process module is installed to manage CO₂ flow with the precision needed for consistent mineralisation and accurate measurement. Third, a CO₂ supply, typically stored in liquid form in a tank outside the curing area, is connected to the process module. The Carbonaide CO₂ Curing System is designed to handle both new facility installations and retrofits of existing chambers. The hardware includes the process module, instrumentation for CO₂ management, and the CO₂ supply module. Chamber modifications are typically designed in collaboration with the manufacturer’s team, and where additional hardware components are needed, these can be sourced through a supply partner network. One practical consideration is CO₂ sourcing. Factories need a reliable local supply of captured CO₂, which can come from industrial sources such as energy production, fermentation, or other process industries. Logistics and sourcing support can be part of the overall solution package, which removes a barrier that might otherwise slow adoption for producers who do not have existing CO₂ supply arrangements. Once operational, the system does not require significant changes to daily production routines. Curing times can actually decrease, which can increase throughput. The process control and data reporting are managed through software, reducing the administrative burden of carbon measurement and certification compared to manual approaches. For concrete manufacturers exploring carbon removal as part of their production strategy, the integration path is well defined and does not require starting from scratch.