Carbon: The Reason We Are Here

The Destination Is Full Decarbonization

After evaluating solutions through the lens of price, scale, and functionality, the industry must now confront the question that motivates all of this work: carbon.

Remember — there are MULTIPLE pathways to reducing the carbon emissions from cement and concrete. So how do you choose what to focus and scale if your goal is to decarbonize concrete?

Also, the goal is not to decarbonize concrete by 5%. It is not to decarbonize it by 50%. It is to decarbonize it all the way — to reach net-zero concrete by 2050 globally. That is the destination. Every solution must be measured against it.

This means the first question the industry should ask about any individual decarbonization solution is not 'how much does it reduce the emissions of a block of concrete?' but rather: does this solution help get there? Does it move concrete toward full decarbonization, or does it achieve a partial reduction while blocking the path to deeper decarbonization?

Of course, the further a solution decarbonizes, the better. Pathways that can technically decarbonize concrete by 80–90%+ alone are exceptional and should be celebrated. But very few solutions will do this alone from a technical feasibility standpoint — not to mention the standpoint of price parity, scalability, or workability and market acceptance. In practice, different LECC solutions are implemented at different points in the value chain and 'blended' together incrementally while price differences or experience with functional performance are absorbed.

This is why the industry must think about decarbonization as a system — not as a single product problem. By 'decarbonize concrete' we don't mean a conceptual product — we mean the concrete system. The 3,000+ existing cement facilities + yet to be built centers for low-carbon cementitious material production + concrete & precast ready mix sites, silo storage and distribution for localized circularity and more.

Stacking and Blending: A Required Part of the Journey

The industry already sees solutions that achieve 70%+ reduction ton-for-ton of cement, but cannot decarbonize concrete all the way on their own. How should the sector think about these?

Stacking and blending should be seen as a realistic and required part of the decarbonization journey. No single technology will eliminate all emissions from concrete. But the right combination of technologies — layered together — can.

This is not a weakness of the sector. It is how industrial decarbonization actually works. Different levers apply at different points in the value chain: at the clinker level, at the cement blend level, at the concrete mix level. Each lever addresses a different slice of the emissions profile. The question is whether they can be combined into a coherent system.

Good stacking means combining solutions that operate on different parts of the emissions equation. A clinker substitution strategy combined with a carbon-cured additive combined with CCS-produced cement can achieve 90%+ reduction because each lever is pulling on a different part of the problem. Bad stacking is arithmetic fiction — the same small intervention counted many times.

What About Additives?

Additives are a perfect example of why the stacking framework matters. Many additives reduce embodied carbon by 5–10%. By themselves, that is not a transformational number. So should the industry ignore them?

No. An additive that reduces emissions by 10% but boosts the cement substitution rate of SCM, carbon-cured aggregates, and low-carbon clinker while improving workability is contributing a real slice to a deeply decarbonized mix. It passes the Ready Mix Truck Test. It does not block other levers. It does not claim to solve the whole problem. It adds to the stack.

The danger comes only when an additive overstates its reduction — when a 2% improvement is marketed as a whole-system solution. That is bad stacking, not a problem with additives per se.