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Coloured concrete stays consistent when you choose a suitable colouring method and keep materials, batching, water, finishing, curing and sealing consistent from one placement to the next. For integral colour, approve a mock-up made with the project’s actual mix and finishing system before work begins; a colour chart alone cannot guarantee the cured result.
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What makes coloured concrete come out uneven?
Integral pigment is distributed through the concrete, but the final appearance is not controlled by pigment alone. Differences in mix design, slump, batching, mixing, placement, finishing, curing and sealer can all change the finished colour. A small, unplanned change repeated across a large pour can therefore produce visible variation between loads or sections.
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Consistency is a whole-process requirement, not a last-minute finishing adjustment. Davis Colors puts the principle plainly in its Architect’s Guide: “The keys to successful concrete, whether colored or not, include consistency in materials and craftsmanship and careful planning and detailing of the project.”
Which concrete colouring method suits the project?
Integral pigment is often the direct choice when the goal is colour throughout new concrete. Other methods—including dry-shake hardener, two-course work, overlays, paint and stain—create different appearances and have different practical requirements. Choose by appearance, whether the concrete is new or existing, service exposure, wear, climate and installation practicality rather than by colour alone.
| Method | Where the colour sits | What to consider |
|---|---|---|
| Integral (one-course) | Through the concrete mix | Best suited to new placements where the mix and pigment can be controlled. Colour consistency depends on keeping materials and production practices steady. |
| Two-course | In a coloured concrete layer over a base | A distinct placement approach; plan the layers and confirm the intended finish with the system guidance. |
| Dry-shake hardener | At the concrete surface | A surface-applied method. Application and finishing control matter to the result. |
| Overlay | In a new surface layer over existing concrete | Can suit a project where an existing surface is being renewed; follow the selected product’s preparation and application requirements. |
| Paint or stain | On the surface | Creates a surface-applied finish rather than integral colour. The Portland Cement Association cautions against paint for exterior flatwork. |
The Portland Cement Association’s guide to coloured finishes describes these common methods and frames selection around aesthetics, economy, service conditions and practicality. It also flags concerns with exterior surface colouring in cold-weather regions exposed to snow-removal equipment or freeze-thaw cycles. Check the selected system’s specifications for the particular project; the methods are not interchangeable simply because they can produce similar colours.
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How do you plan integral colour for a consistent result?
Start by locking down the recipe and the desired finish before ordering concrete. Integral pigment colours a new mix throughout its depth, so changes in cement, aggregates, supplementary cementitious materials, pigment or proportions can affect the appearance. Decide on the pigment identity and dosage from the manufacturer’s colour guidance, then make sure the approved mix design and batch ticket agree.
- Choose the method and target appearance. Decide whether the project calls for colour through the mix or a surface-applied system. Consider the slab’s exposure, wear, climate and finish, not just the colour sample.
- Specify the materials and mix. Keep cement, aggregates, supplementary cementitious materials, pigment and mix design consistent across placements. If the mix must change, treat the revised mix as a new colour combination and reassess it.
- Set and verify pigment dosage. Record the pigment number and dosage in the project information. Check each batch ticket against the approved mix design so that the pigment and its amount are not left to memory or assumption.
- Plan production and delivery. Arrange deliveries to support consistent mixing times and a steady placement sequence. Keep batching and mixing procedures consistent; follow the product and concrete supplier’s instructions rather than adjusting the mix informally at the site.
- Make and approve a representative mock-up. Use the actual materials, mix, tools, finish, curing compound and sealer intended for the work. Review it after the specified curing and sealing process, because those choices affect the appearance.
- Repeat the approved process. Keep placement, finishing, curing and sealing practices aligned with the mock-up. Communicate the agreed procedure to everyone handling the work.
Sika recommends a jobsite mock-up using the actual materials, tools and techniques. Its CHROMIX guidance advises representative mock-ups for each mix design, finish or texture, and curing-compound and sealer combination. A mock-up is useful precisely because a pigment chart cannot account for every project material and process variable.
How much pigment should you use?
Use the pigment manufacturer’s dosage guidance for the specific product and approved concrete mix. There is no universal job dosage in the sources here. MATCRETE, for example, gives a typical rate of ½ to 4 pounds per 94-pound sack of cementitious material for its product; that is product-specific guidance, not a rate to transfer to other pigments or mixes.
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ASTM C979/C979M-24, the current ASTM specification identified for pigments used in integrally coloured concrete, sets a maximum prescribed pigment dosage of 10 mass% of cement. This is a standard limit, not a recommended target dosage for every job. MATCRETE also warns that exceeding 10% colour content can adversely affect strength, and directs users to its colour chart and the project mix.
ASTM’s specification covers pigment requirements and tests that include water wettability, alkali resistance, sulfate content, water solubility, atmospheric curing stability, light resistance, effects on concrete such as setting, air content and compressive strength, and shipment colour match. It does not establish compatibility with other admixtures unless those materials are tested in combination. Ask the relevant manufacturers or concrete supplier about compatibility when the mix includes other admixtures, and verify the complete combination in the mock-up.
How do curing and sealing affect the colour?
Curing and sealing are part of the colour system because the products and practices used at this stage can change the finished appearance. Choose the curing compound and sealer before the mock-up, verify that they are suitable with the pigment system, and use the approved combination on the production work. An unapproved compound or a changed sealer can make an otherwise consistent mix look different.
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Keep the curing approach consistent from section to section. Davis Colors notes that water, membranes or unapproved curing compounds can discolour concrete. Sika likewise recommends consistent curing and sealing, and calls for mock-ups that represent the selected product combination. If the project changes curing product, sealer, finish or texture after approval, reassess the appearance rather than assuming the old mock-up still represents the work.
Do not compensate for surface conditions by adding water during finishing. Besides the risk of pale or discoloured areas, uncontrolled water changes the conditions at the surface and undermines repeatability. Follow the specified finishing and curing instructions for the selected concrete and pigment system.
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What should you check when colour varies?
Compare the affected area with the approved mock-up and look for a process change before blaming the pigment. Review the mix design and batch tickets, then check whether water, mixing time, delivery timing, placement, finishing, curing or sealing differed between the uniform and uneven areas.
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- Different loads or sections: compare the batch tickets, pigment identity and dosage, mix materials, and mixing or delivery sequence.
- Pale or discoloured surface patches: check for water added to tools or used during brooming, excessive bleed water, and changes in finishing practice.
- Variation after curing or sealing: verify which products were used, whether they were approved for the pigment system, and whether application was consistent.
- A mismatch with the sample: confirm that the sample and placed work used the same materials, mix, finish, curing product and sealer. A chart is a selection guide; judge the expected project appearance against the cured mock-up.
These checks can identify likely sources of variation, but they cannot guarantee that a finished slab will match a chart or a different project. If a change is needed, agree on the revised materials and process, make a new representative mock-up, and approve it before continuing the remaining work.
What is the practical checklist before the pour?
- Confirm the colouring method fits the desired appearance, project conditions, exposure and practicality.
- Document the intended cement, aggregates, supplementary cementitious materials, pigment and mix design.
- Verify pigment number and dosage against the approved mix design and each batch ticket.
- Plan consistent batching, mixing, water control, placement and finishing. Do not add uncontrolled water during finishing.
- Select the curing compound and sealer, and check their compatibility with the chosen pigment system.
- Approve a mock-up made with the actual materials, tools, finish, curing and sealing approach.
- Keep the approved method consistent, and repeat the mock-up approval process if a material or finish changes.
On a coloured-concrete job, repeatability is the practical route to a uniform result: decide what will be used, document it, verify each batch and make the whole team follow the approved process.
Frequently Asked Questions
Does ASTM-compliant pigment guarantee the finished slab will match a colour chart?
No. ASTM C979/C979M-24 specifies pigment requirements and tests, including shipment colour match, but the project’s mix, finishing, curing and sealing also affect the result. A representative cured mock-up is a better basis for approval than a chart alone.
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Do not assume the same dose will produce the same appearance after a mix change. Confirm the revised mix and dosage with the pigment and concrete supplier, then assess that combination in a new mock-up before full placement.
Can I paint an existing concrete driveway to change its colour?
Paint is a surface-applied colouring method, not integral colour, and the Portland Cement Association cautions against paint for exterior flatwork. For an exterior driveway, choose a system suited to its exposure and service conditions and follow that system’s preparation and application specifications.
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