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The main barriers are not a single technical defect. They are an interlocking set of cost, supply, approval, data and coordination problems. A low-carbon cement or concrete option may be technically suitable yet unavailable locally, difficult to approve under a prescriptive specification, impossible to compare fairly because its emissions data use different assumptions, or rejected because the party paying a premium is not the party receiving the climate benefit. The practical answer is to test each candidate mix against the project’s performance requirements, local rules, delivered price, lead time, volume and verified embodied-carbon data before procurement.
First, define what “low-carbon cement” means
Cement is the binding ingredient in concrete; concrete also contains aggregates, water and admixtures. A building project can reduce concrete’s embodied emissions by changing the cement itself, replacing part of the cement with supplementary cementitious materials (SCMs), using alternative raw materials, reducing the quantity of cement needed for the required function, improving material efficiency, or applying carbon capture at a cement plant. These routes have different costs, supply chains, performance characteristics and approval requirements.
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That distinction matters because a claim about one pathway cannot be applied to every lower-carbon mix. A carbon-capture plant, for example, has a very different investment profile from a concrete mix that uses an available SCM. Nor does a lower-carbon mix automatically perform worse: strength development, durability, fire resistance and other properties depend on the formulation, exposure and design, not simply on its carbon label.
The project brief should therefore define a functional requirement rather than purchase an unqualified label. State the required strength class, exposure and durability limits, fire and service-life requirements, placement method, curing conditions, programme constraints and the maximum acceptable embodied carbon for the relevant element.
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1. Cost and commercial risk
Why some pathways carry a substantial premium
Deep-decarbonisation routes can require new kilns, capture equipment, transport and storage infrastructure, renewable energy or different feedstocks. The International Energy Agency (IEA) estimates that early commercial near-zero-emissions cement plants using carbon capture could have production costs 75–150% higher than today’s conventional plants, varying by region. That is an industry production-cost estimate for early plants, not a quoted premium for every low-carbon concrete mix or for a particular building. It should not be converted directly into a predicted concrete invoice.
Project economics also include qualification, testing, separate storage, smaller production runs, transport and the risk of delay if a supplier cannot meet the specification. A contractor may price that uncertainty even when the material’s factory cost is close to a conventional alternative. Conversely, an efficiently designed mix using locally available SCMs or less cement may have little or no cost increase.
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The Government of Canada’s Strategies for low carbon concrete: primer for federal government procurement, dated 2022, says numerous embodied-carbon strategies can be achieved with no additional cost and minimal performance impacts. “Numerous” is not a guarantee for every mix, location or project; it means the team should compare actual compliant options instead of assuming a premium.
Commercial risk often comes from split incentives. An owner may value a lower-carbon asset, while a contractor carries the cost of additional trials, a designer bears approval risk, and a supplier must invest before demand is firm. Unless the contract identifies who owns the carbon target, who approves substitutions and how any price change is handled, a technically acceptable option can be rejected late.
What to price
- Delivered material cost for a functionally equivalent mix, not only the cement plant price.
- Testing, trial batches, laboratory verification and any redesign or rescheduling.
- Separate storage, minimum order quantities, transport distance and contingency for failed deliveries.
- Potential savings from lower cement content, reduced material quantities or avoided carbon charges where a policy applies.
- The cost of delay if approval or supply is not secured before the pour sequence is fixed.
2. Local availability, volume and lead time
Global deployment does not prove local supply
The IEA’s Breakthrough Agenda Report 2025: Cement and concrete reports about 35 Mt of near-zero-emissions cement capacity by 2030, a 30% increase from the prior year, while the project pipeline remains below the pace required by the IEA Net Zero Emissions by 2050 Scenario. This is a global deployment indicator. It is not a list of products in stock near your site, a supplier count, or a guarantee that a compliant mix can be delivered in your region.
A building project still needs a producer serving its location, a product that meets the governing standard, sufficient volume for the pour schedule and a delivery route that works in practice. Availability can differ sharply between metropolitan and remote sites, between ordinary structural concrete and specialist applications, and between one country’s approved SCMs and another’s.
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Questions to ask suppliers early
- Which named plant will manufacture the cement or concrete, and is it currently operating at the required scale?
- Can the supplier provide the required grade, durability class and project quantity for every planned pour?
- What are the normal and worst-case lead times, including testing and approval?
- Are alternative sources available if the primary plant is interrupted?
- Will the supplier reserve capacity, and what minimum order or cancellation terms apply?
- Can the supplier provide a current, project-relevant Environmental Product Declaration (EPD) and explain its scope?
Firm offtakes and advance purchase agreements can improve supplier certainty. The IEA states that such commitments can facilitate final investment decisions and the establishment of supply chains. They are useful only when the buyer can specify realistic quantities, timing and quality requirements; they do not remove the need for project-level design and approval.
3. Building codes, material standards and prescriptive specifications
Where rules create a barrier
Codes and standards may not cover an alternative raw material, cement blend or manufacturing route, or they may permit it only under a national approval, performance test or engineering assessment. A project specification can be even more restrictive when it names a cement type or limits SCM substitution instead of stating the performance that the finished concrete must achieve.
The IEA says code revisions can facilitate greater use of alternative raw materials while retaining safety and performance. UNFCCC technical material identifies lack of standards and poor coordination across the building industry as barriers. The applicable route is jurisdiction-specific: the authority having jurisdiction, structural engineer, fire engineer, insurer and client may each have a role.
Performance-based wording helps, but does not bypass approval
A performance-based specification can allow an eligible alternative when it defines measurable outcomes—such as strength at the required age, permeability, freeze-thaw resistance, chloride resistance, fire performance and service life—rather than prescribing one recipe. The designer must still demonstrate that the proposed mix meets those outcomes and that the code permits the evidence.
Approval timing is a frequent hidden barrier. A mix that is acceptable in principle may need trial pours, additional curing records, test certificates or a formal substitution request. Begin that work before tender or, at minimum, before the concrete pour sequence is locked. Do not assume that approval in one jurisdiction transfers to another.
4. Inconsistent carbon data and definitions
Why two “low-carbon” numbers may not be comparable
A carbon figure is meaningful only with its declared unit, system boundary, lifecycle modules, data quality, assumptions and validity period. One EPD may report kilograms of carbon dioxide equivalent per tonne of cement at the factory gate; another may report per cubic metre of concrete and include transport or construction. Comparing those values without normalising the function and boundary can reverse the apparent ranking.
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UNFCCC material identifies unclear life-cycle assessment (LCA) methods and limited data as obstacles. Ireland’s 2024 government report, Reducing embodied carbon in cement and concrete through Public Procurement in Ireland, describes LCA standards, product and project databases, baselines and calculation tools as the foundation for procurement policies that require disclosure and set reduction targets.
EPD and LCA checks for a fair comparison
| Check | What to confirm |
|---|---|
| Functional basis | Compare mixes that perform the same structural or durability function, using compatible units such as a specified volume and strength class. |
| Boundary | Record whether the figure covers raw materials, manufacturing, transport, construction, use and end of life; do not mix factory-gate and whole-life results without adjustment. |
| Lifecycle modules | Identify the modules included and excluded, including transport and carbonation assumptions. |
| Validity and verification | Check the EPD issue date, expiry, programme rules and independent verification status. |
| Project applicability | Confirm that the plant, formulation, region and delivery distance match the actual project rather than a generic industry average. |
| Baseline | Use a documented conventional reference mix from the same project conditions so the reduction is not created by changing the comparison. |
Ask for the underlying quantity of cement, SCM replacement rate, transport assumptions and strength-age basis when the EPD alone does not explain the result. Keep the calculation file with the design record so a later substitution can be assessed on the same basis.
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5. Fragmented incentives and weak coordination
Owners, architects, structural engineers, contractors, ready-mix producers, cement manufacturers, certifiers and public authorities control different parts of the decision. UNFCCC material identifies fragmented coordination, insufficient incentives and low awareness. A supplier may have a lower-carbon product, but the design team may not know it, the specification may prohibit it, and the contractor may have no contractual reason to investigate it.
The IEA calls public procurement commitments a key lever and points to demand aggregation and firm offtakes. Public clients can create predictable demand through framework agreements, minimum embodied-carbon requirements and approved alternatives. Private clients can use early supplier engagement and a stated carbon target. Both approaches work best when requirements are set before tender rather than introduced as an unfunded change order.
Coordination also covers construction sequencing. Some mixes develop strength more slowly or require different curing controls. The team must align the mix with formwork striking, post-tensioning, lifting, heating, weather protection and inspection dates. A carbon target that ignores programme constraints will be treated as a risk rather than a design requirement.
How to compare technically acceptable options
When more than one mix can meet the brief, evaluate the options together rather than selecting on carbon alone.
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| Decision axis | Evidence to record |
|---|---|
| Embodied emissions | Comparable EPD/LCA result, declared unit, boundary, modules, baseline and reduction percentage. |
| Performance | Strength at the specified age, durability, fire and service-life evidence, curing requirements and test results. |
| Delivered cost | Supplier quotation, transport, testing, contingency, minimum quantities and any premium or saving. |
| Supply resilience | Plant location, available volume, lead time, backup source and capacity reservation. |
| Construction programme | Strength development, placement, curing, inspection and effects on sequencing. |
| Evidence quality | EPD validity, verification, plant and formulation match, and approval status under local rules. |
A project process that reduces the barriers
- Set the functional brief. Ask the design team to document strength, exposure, durability, fire, service life, placement and programme requirements for each concrete application.
- Check the rulebook. Identify the governing building code, cement and aggregate standards, specification clauses, authority approvals and insurer requirements. Decide whether a performance-based alternative is permitted.
- Map the market. Contact qualified local suppliers early with the required grades, quantities, pour dates and site location. Obtain written confirmation of product availability and lead time.
- Request comparable evidence. Collect current EPDs and supporting mix data. Align declared units, lifecycle boundaries, modules, transport assumptions and baselines before calculating a reduction.
- Run technical trials where needed. Verify strength development, durability and curing under site-relevant conditions. Record results in the approval package rather than relying on a generic product sheet.
- Build a delivered-cost comparison. Include material, transport, testing, storage, contingency and programme effects. State who pays any premium and who has authority to approve a substitution.
- Lock procurement and contingency. Reserve capacity or use an offtake arrangement when the project scale justifies it. Name an approved backup mix and define the evidence needed to switch without stopping work.
- Monitor delivery and document the result. Check batch tickets, supplied formulation, curing records and the final carbon calculation. A verified as-built record prevents the claimed reduction from depending on an unconfirmed substitution.
Common failure modes and how to correct them
Assuming a global figure is a local quotation
Industry cost or capacity statistics describe market conditions, not your supplier’s price or inventory. Replace the assumption with a written, project-specific quotation and delivery commitment.
Choosing a mix by its label alone
“Low-carbon” does not identify the binder, strength age, boundary or plant. Require the EPD, formulation and performance evidence before approving the option.
Waiting until construction to seek approval
Late substitutions collide with code reviews, testing and programme commitments. Include alternatives in the design and tender documents, then obtain approval before the first affected pour.
Comparing incompatible carbon figures
A factory-gate cement result cannot be compared directly with a whole-life concrete result. Recalculate on a common functional basis or state clearly why the comparison is limited.
Leaving the incentive unresolved
If the contractor bears extra work while the owner receives the carbon benefit, the option may disappear during value engineering. Put the target, evidence requirements, approval authority and cost treatment in the contract.
What the evidence can—and cannot—tell a project team
The IEA, Canada, UNFCCC and Ireland sources support a common direction: make standards more enabling, improve carbon data, coordinate buyers and suppliers, and use procurement to create dependable demand. They do not establish local compliance, local price, local availability or expected savings for a particular building. Those facts depend on the jurisdiction, structural use, specification, quantity, supplier and date.
A low-carbon cement decision is ready for procurement only when the team can show five things in writing: the mix meets the project’s functional requirements; the approval route is clear; a qualified supplier can deliver the required volume on schedule; the embodied-carbon comparison uses compatible, current data; and the contract assigns cost, risk and decision authority. If any one of those records is missing, the barrier is still a project risk rather than a solved design choice.
Quick Recap
Sources and further reading
- International Energy Agency, Breakthrough Agenda Report 2025: Cement and concrete (2025)
- Government of Canada, Strategies for low carbon concrete: primer for federal government procurement (2022)
- UNFCCC, Sixth Global Research and Development Conference material: barriers to decarbonisation of building materials (2024)
- Ireland Department of Enterprise, Tourism and Employment, Reducing embodied carbon in cement and concrete through Public Procurement in Ireland (2024)
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