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Low-carbon cement can meet a project’s strength and durability requirements, but there is no universally safe cement type or supplementary cementitious material (SCM) percentage. Choose the lowest-carbon concrete mix that meets the specified strength at the required test age, the project’s exposure conditions and construction schedule—and verify the actual mix with comparable carbon data and supplier evidence.
The practical decision is about concrete performance, not cement alone. A lower-carbon binder may affect early strength, setting, finishing and curing; its suitability also depends on local standards, supply and the structure’s exposure. The steps below help you compare options without treating a carbon reduction as proof of equivalent performance.
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What does “low-carbon cement” mean in a concrete mix?
It can mean a blended cement, a concrete mix that replaces some Portland cement with supplementary cementitious materials (SCMs), or—in particular applications—a less conventional binder system. These are related but not identical choices, and their names, permitted uses and availability vary by jurisdiction.
In the United States, ASTM C595 includes Type IL portland-limestone cement as well as other blended cements. The American Cement Association describes Type IL as containing more than 5% and no more than 15% limestone by mass. It says PLC can reduce concrete carbon by up to 10%, and reports an industry-wide average reduction of 8.2% compared with Portland cement based on EPDs. Those are association-reported comparisons, not a guaranteed saving for a particular mix or project. See the American Cement Association’s blended-cement overview.
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Concrete producers may also use SCMs such as fly ash, slag cement, natural pozzolans or calcined clay. Ternary and other multi-component blends combine more than one supplementary material. The options may help reduce the amount of Portland cement in a mix, but their performance depends on the materials, proportions, mix design, curing and application. Newer or non-general-purpose systems, including alkali-activated binders, need an acceptance pathway and performance evidence appropriate to their intended use; do not assume they are interchangeable with conventional cement.
For example, an Institution of Civil Engineers and Low Carbon Concrete Group routemap describes CEM III/B cement with up to 80% ground granulated blast-furnace slag (GGBS), and states a 73% lower embodied-carbon comparison than CEM I. That is a published comparison for the category described in the routemap—not a universal product result or a promise that every concrete made with a similar binder will have that reduction. Read the Low Carbon Concrete Routemap.
In short, ask what the proposed concrete mix is, rather than choosing by a binder label or SCM percentage alone.
How do I choose a mix without compromising strength or durability?
Start with the project’s requirements, then screen candidate mixes against them. The lowest-carbon option is suitable only if it can meet the specified strength at the required test age, withstand the relevant exposures, and fit the placement and construction sequence.
- Set the performance brief. Identify the required strength class and test age, exposure conditions, service requirements, placement method, finish, and dates when the concrete must be stripped, loaded or otherwise used. Include prestressing or other schedule-critical operations where applicable.
- Ask local suppliers what is feasible. Request locally available blended cements and SCM sources, and ask whether a candidate mix can satisfy the brief. Discuss source consistency, availability, code status and whether the mix has been used or verified for the relevant application.
- Request evidence for the proposed mix. Ask for its declared binder and SCM content, strength data at the specified age, early-age performance information, curing expectations and relevant durability evidence. Request a product- or mix-specific environmental product declaration (EPD) where available.
- Compare carbon on an equivalent basis. Check that candidate EPDs use comparable boundaries and declared units, and that the mixes provide the same required performance. Consider whether a mix needs more binder or relies on scarce materials; a low-carbon binder by mass may not produce the lowest-carbon suitable concrete overall.
- Confirm the acceptance route. Check the applicable local standard and any project, authority or infrastructure approval requirements before the mix is specified. Arrange verification, trial batches or approval where the specification or authority requires them—especially for unfamiliar or ambitious blends.
- Put the agreement in the specification. Record the required test age, exposure performance, carbon evidence, curing expectations, verification documents and acceptance criteria. Avoid a prescriptive SCM percentage unless it is required by the governing code or justified by project performance needs.
This sequence prevents a common mistake: selecting a mix because its headline carbon figure is attractive, then discovering that early strength, curing or approvals do not fit the build.
Which lower-carbon cement and binder options should I consider?
There is no universal ranking that works for every project. Use the options below as a shortlist for a supplier and designer to assess against local rules, availability and the actual performance brief.
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|---|---|---|
| Type IL portland-limestone cement | A blended-cement option recognized in U.S. ASTM C595 and AASHTO M 240 contexts. The American Cement Association describes it as commonly available in the United States. | Applicable local standard, supplier product, mix-specific carbon data, and performance for the project’s strength, exposure and construction sequence. |
| Fly ash or slag cement in a blend | Established SCM options used in multiple markets. | Material source and consistency, local supply, permitted proportions, early strength, curing and exposure-specific durability. |
| Ternary or multi-component blends | May combine materials rather than depending on one SCM; guidance in the UK and New South Wales describes multi-component approaches. | Governing standard, local availability and performance evidence for the proposed blend and application. |
| Calcined clay or other newer binders | May be an alternative where available and accepted. | Relevant material standard, supplier data, application evidence, availability and approval pathway. Acceptance cannot be assumed to match conventional cement. |
| Alkali-activated or other non-general-purpose systems | May suit particular applications. | Application-specific strength and durability evidence, exposure assessment and confirmation of how the system can be accepted under the project’s rules. |
The table is a set of questions to take to the design team and supplier, not a universal performance ranking. Cement classifications and approval routes are jurisdiction-specific: a U.S. ASTM option, a UK cement category and an Australian project requirement are not interchangeable.
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Why do strength age and construction schedule matter?
Concrete strength is tied to a stated test age, while construction decisions often depend on earlier-age performance. A mix that meets its specified later-age strength may still affect stripping, loading, prestressing or the pace of following trades.
Higher SCM contents can reduce early-age strength or slow strength development, depending on the materials and mix. That does not automatically make a mix unsuitable: it means the supplier and project team need to agree on the required strength age and on when the concrete must be ready for the next operation. Do not treat “meets strength” as a complete answer unless the test age and the construction milestones are clear.
Ask the supplier to provide performance information relevant to the planned sequence. If early loading or formwork removal is critical, say so before the mix is fixed. Where the data do not establish that the proposed mix can meet the schedule, consider a project-relevant verification or trial batch rather than relying on a general claim about a cement type.
The available guidance does not establish a single strength-development curve or universal service-life value for every low-carbon mix. Performance must be assessed for the actual mix, specified test age, curing regime, exposure and governing requirements.
What durability risks should the design team check?
Durability is exposure-specific. Higher replacement levels can raise carbonation concerns in some circumstances, but the risk is not determined by SCM percentage alone. The concrete’s permeability, curing, cover, coatings and service exposure all matter.
The New South Wales government factsheet identifies carbonation resistance as a consideration for a specific SCM context and says additional cover or coating can mitigate the risk. That is not a blanket instruction to add cover or coating to every SCM concrete. The designer should assess the proposed mix against the actual exposure and applicable design requirements. See the NSW supplementary cementitious materials factsheet.
Check the project’s relevant chemical, freeze-thaw, chloride, sulfate, alkali-silica reaction and other exposure requirements with the governing code and supplier documentation. A claim that a mix is “durable” without identifying the exposure and evidence is too broad to support a specification.
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For unfamiliar or high-SCM mixes, request performance evidence relevant to the project and establish who will verify it. Some infrastructure projects may require additional approval or documentation. Trial batches can be appropriate where required by the authority, the project specification or the uncertainty of the proposed mix.
How should I compare embodied-carbon figures?
Prefer an EPD for the actual product or concrete mix, and compare it with other options that use compatible boundaries, declared units and performance assumptions. A cement-level number is not necessarily a fair proxy for a cubic metre of concrete that meets a particular strength and exposure requirement.
New South Wales guidance calls EPDs a preferred method for reducing embodied carbon. Its 2025 guidance also illustrates why local fallback factors must be labeled rather than treated as universal: it cites AusLCI factors of 19.8 kg CO₂e per tonne for fly ash, 192 kg CO₂e per tonne for slag and 967 kg CO₂e per tonne for Portland cement. These are NSW guidance examples, not product-specific EPD values that can be applied unchanged to every region or supplier. Read the NSW low-carbon concrete requirements guidance.
If an appropriate EPD is unavailable, agree on an explicitly stated local fallback method and a consistent baseline. Do not compare one candidate’s product-specific declaration with another candidate’s generic factor as if they were equivalent. Record the declared unit and boundaries alongside the result so the comparison can be reviewed.
Also consider mix efficiency. The ICE routemap cautions that the lowest-carbon binder by mass may not be the best concrete option if the mix is inefficient, unsuitable or unavailable. A candidate that uses more binder or depends on a scarce SCM could weaken the intended benefit. Carbon should be compared only after the options are shown to meet the same required project performance.
Are high-SCM concrete mixes suitable for every project?
No. Their suitability depends on the application, exposure, required strength age, curing and construction schedule, along with local standards, supply and project approval requirements. A higher replacement percentage is not, by itself, evidence of a better or acceptable mix.
New South Wales guidance gives conventional examples of 10–25% fly ash and 30–50% slag, while also describing project guidance examples such as 35% fly ash for cast-in-situ concrete, 30% for precast or prestressed concrete, and 50% overall slag with different cast-in-situ and precast/prestressed examples. These examples belong to that guidance and context; they are not universal limits or recommendations for projects elsewhere. Its guidance notes that ambitious levels can bring performance and curing considerations, including longer curing (more than seven days) among the issues to consider.
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For ambitious proportions, engage the supplier early and ask for verification documents and project-relevant performance information. The NSW example recommends supplier engagement two to four months ahead where trials may be needed; treat that as a jurisdiction-specific planning example, not a universal lead time. The mix designer and construction team should agree how curing, finishing and sequencing will be managed before work starts.
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Specify the required outcome and the evidence needed to demonstrate it. A specification based only on an SCM percentage can exclude suitable mixes or accept a mix that does not fit the project’s strength, durability or schedule.
- Required strength class and the test age at which it must be demonstrated.
- Applicable exposure conditions and the required performance or design provisions for those conditions.
- Placement, finishing and construction sequence constraints, including any early-age strength milestones.
- Carbon reporting requirements, including the preferred product- or mix-specific EPD and the rules for any fallback comparison.
- Required supplier performance data, verification documents, trials or authority approvals.
- Curing expectations and who is responsible for incorporating them into the construction plan.
- Acceptance criteria and the process for reviewing a proposed alternative mix.
Performance-based requirements help keep the specification focused on the structure’s needs. If a governing code or project requirement imposes a material or proportion limit, follow that requirement; otherwise, avoid inventing a universal SCM cap where the evidence supports evaluating the actual mix.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What are common selection mistakes?
- Choosing by SCM percentage alone. A larger replacement number does not prove lower project carbon, acceptable early strength or durability. Compare the complete mix and its performance evidence.
- Using a later-age strength result to answer an early-age question. Confirm the test age and the schedule-critical milestones separately.
- Comparing incompatible carbon figures. Align EPD boundaries, declared units, baseline and performance basis; use a clearly labeled local fallback if comparable EPDs are unavailable.
- Assuming standards travel across borders. Check the rules and approval route where the concrete will be supplied and used.
- Leaving curing until site delivery. Higher SCM mixes may need curing planning and, in some cases, longer curing. Agree on the method and expectations before construction.
- Locking a novel mix too late. Availability, verification and trials can require advance coordination. In the NSW guidance context, two to four months is an example lead time for early supplier engagement when trials may be needed.
These mistakes are avoidable when carbon, performance and construction planning are treated as one specification decision rather than separate procurement questions.
What evidence should I ask a supplier to provide?
Ask for a package that lets the designer assess both the carbon claim and the concrete’s suitability. The precise documents depend on local requirements, but a useful request includes:
- The proposed mix and declared cement and SCM types and proportions.
- A product- or mix-specific EPD, if available, with declared unit and boundary information.
- Strength data at the required test age, plus early-age information if stripping, prestressing, loading or sequencing depends on it.
- Information relevant to the project’s exposure and durability requirements.
- Curing and placement guidance, including any differences from the project’s normal practice.
- Availability, material-source information and the supplier’s proposed verification or trial process.
- Confirmation of the applicable standard and any approval documentation required for the project.
Supplier data do not replace the designer’s responsibility to specify and assess the concrete. They do let the project team make the comparison on evidence rather than assumptions.
How do regional carbon targets fit into the decision?
Regional targets can guide procurement, but they are not universal performance rules. For example, NSW government guidance gives illustrative minimum average reduction targets of 45% for structural cast-in-situ concrete and 35% for structural precast or prestressed concrete. It also notes that project conditions and regional supply capability can lead to adjustments. These figures belong to the NSW guidance and should not be presented as requirements for projects elsewhere.
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Likewise, carbon factors, cement categories, accepted SCM proportions and approval procedures vary by jurisdiction. A project should identify the applicable local framework first, then compare options that can satisfy it. The MECLA FAQ addresses questions about high-SCM suitability, standards and durability in the Australian context; its discussion is useful for framing questions but does not create a universal rule for every market. Read the MECLA low-carbon concrete FAQ.
Availability is also a real constraint. A mix may appear favorable on paper but depend on an SCM source that is not available consistently in the project’s region. Confirm supply before finalizing the specification, and allow time for trials or approval if the selected material is unfamiliar to the supplier or authority.
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Can low-carbon concrete be used for foundations?
Potentially, but the answer depends on the foundation’s specified strength, ground and environmental exposure, placement conditions and local acceptance requirements. Have the designer assess the proposed mix for those conditions rather than relying on a general claim about a cement type.
Does more slag or fly ash always mean lower embodied carbon?
Not necessarily. The result depends on the full mix, material sources and carbon-accounting boundaries; additional binder or a scarce SCM can change the comparison. Use compatible mix-level evidence rather than inferring the result from a replacement percentage.
Who decides whether a low-carbon mix is acceptable on a project?
The project’s design and specification process determines the performance requirements, while suppliers provide mix data and authorities may impose standards or approvals. The precise roles and approval route depend on the contract and jurisdiction.
Can I use a concrete curing blanket with a high-SCM mix?
A blanket may be one possible field aid, but the right curing method depends on the mix, weather, site conditions and specification. Confirm the required curing approach with the supplier and project team before selecting equipment.
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