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To mix color pigment into concrete consistently, use an integral concrete pigment, dose it against the mix’s cementitious content, keep the water and mix design consistent, and mix according to the pigment’s instructions. Make and approve a cured mock-up with the actual materials and finish before the production pour; a correct dose alone cannot guarantee a uniform shade.
What do you need before mixing colored concrete?
Before batching, settle the color, mix design, finishing method, and curing method with the concrete supplier or contractor. Colored concrete is less forgiving of batch-to-batch changes: differences in cement, aggregates, water, mixing, finishing, or curing can show up as shade variation, streaks, or mottling.
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- Integral concrete pigment: Choose a concrete-specific synthetic mineral or iron-oxide pigment, and check its technical information for ASTM C979 documentation, dosage, mixing sequence, and compatibility.
- A fixed mix design: Record cement type and source, aggregates and sand, pigment quantity, water, slump, and admixtures. Keep them consistent for every batch and adjacent pour.
- A controlled batching and mixing procedure: Agree on when pigment goes in and how long the mix will be mixed. Follow the selected product’s guidance and the plant’s established procedure.
- A curing and finishing plan: Use the same finishing approach and timing across the work, and select a curing compound or sealer approved for colored concrete.
- A cured sample panel: Make it from the actual materials and process, then approve its appearance before committing to the full pour.
Integral pigment is mixed through the concrete. It is not the same as a dry-shake color hardener, which is applied to the surface. If you want batch-colored concrete, tell the ready-mix supplier that you need integral color and confirm which product and procedure it will use.
What kind of pigment should you use?
Use a pigment formulated for integrally colored concrete, not a general-purpose colorant. ASTM C979/C979M-16 covers pigments used as concrete admixtures and specifies a maximum prescribed dosage of 10% of cement mass; check the standard’s scope and requirements alongside the pigment manufacturer’s instructions.
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“Maximum” is not a recommended target. The right quantity depends on the color you want, the pigment product, and the concrete’s cementitious materials. Confirm ASTM documentation and the dosage guidance in the product’s own technical sheet rather than assuming that all pigments can be dosed alike.
Integral pigments may be supplied as loose powder, a dissolvable bag, or liquid. These forms affect handling and batching, so ask the supplier which form it offers and follow its mixing instructions. Do not assume a sequence or mixing time for one product applies to another.
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Calculate the dose from the amount of cementitious material in the batch, then follow the chosen product’s color chart and technical sheet. Do not calculate from the finished concrete’s total weight or volume unless the product’s instructions specifically tell you to use that basis.
As one product-specific reference, Davis Colors’ Architect’s Guide gives a typical starting range of 1–5 pounds per 94-pound sack of cement, with a 10% maximum. That is not a universal recipe: the desired shade and cementitious materials affect the rate, and the manufacturer’s guidance for the product you are actually using takes precedence.
For example, five 94-pound sacks contain 470 pounds of cement. A 1–5-pound-per-sack starting range would be 5–25 pounds of pigment before any adjustment required by the product’s chart. Ten percent of 470 pounds is 47 pounds, which illustrates that the ASTM ceiling is a maximum limit rather than a sensible color target. If fly ash or slag is included in the cementitious basis, recalculate using the total directed by the manufacturer instead of blindly multiplying the cement-only figure.
When the mix includes fly ash, slag, silica fume, lime, or another supplementary cementitious material, ask the pigment manufacturer how to calculate the basis. Treat those materials as part of the cementitious total when the manufacturer directs you to do so. If you and the supplier use different denominators, the batch may receive a different pigment-to-cementitious-material ratio than intended.
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Write the calculation down before production. Record the pigment product and form, quantity per batch, cementitious quantity used as the basis, and any supplier-specific directions. Keep that ratio fixed for every load. The ASTM ceiling is a limit, not a shortcut for selecting a shade; increasing pigment beyond the color chart’s recommendation does not replace a mock-up or a controlled mix design.
How do you mix pigment into concrete step by step?
Use the pigment manufacturer’s instructions and the concrete plant’s established procedure as the controlling instructions. A central-mixing sequence published by manufacturers is an example, not a universal order for every pigment, mixer, or plant.
- Confirm the approved mix and color. Check the batch design, pigment calculation, cementitious materials, water, slump target, admixtures, and the approved mock-up. Resolve discrepancies before charging the mixer.
- Measure each ingredient consistently. Use the same specified pigment dose and mix proportions for each batch. Avoid changing cement source, aggregate, water, or admixtures between loads without confirming the effect with the supplier.
- Follow the specified charging sequence. For central mixing, one manufacturer’s typical sequence is to charge about two-thirds of the water and one-third of the aggregate, then add pigment with the aggregate and cement before adding the full water charge. This sequence is product-specific guidance; follow the selected product’s sheet and plant procedure if they differ.
- Complete the charge and mix thoroughly. Continue the plant’s established mixing cycle. The goal is complete pigment dispersion, not merely adding color to the load. Inadequate mixing can leave streaks and patches.
- Keep the procedure fixed. Use the same sequence and mixing duration for later batches. Do not make informal adjustments to the water or mixing cycle to compensate for a color that looks different while fresh.
- Check the batch before placement. Confirm that the load follows the approved mix and has no unplanned water additions. If it deviates, involve the supplier rather than trying to correct the shade at the job site.
Before the first production batch, agree with the plant on what “mix thoroughly” means for that product and mixer. Published guidance varies: the cited instructions range from at least 5 minutes or 100 revolutions to 8–12 minutes or 120–150 revolutions. For example, Sika lists at least 5 minutes and 130 drum revolutions as typical for CHROMIX L, and at least 100 revolutions for SikaColor-100 P. Those figures are product-specific, not interchangeable universal minimums. See the relevant CHROMIX L information or SikaColor-100 P information, then confirm the procedure with the plant.
How do you prevent streaks, mottling, and shade changes?
Start by controlling the variables that change the pigment ratio or the concrete surface. Consistent cement, aggregates, water, slump, admixtures, mixing, finishing, and curing matter together; a consistent pigment dose cannot compensate for a substantially different batch or finishing process.
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Do not add unplanned water after batching or during finishing. Extra water changes the water-cement ratio and can make the color paler; it also changes concrete performance. If the mix needs more workability, ask the supplier about an approved water-reducing or plasticizing admixture within the mix design rather than adding water on site. MATCRETE’s integral-color technical bulletin also explains why low water content supports a richer, darker color as well as hardness and reduced shrinkage and cracking.
Give the pigment enough mixing time
Under-mixing is a common cause of streaks and mottling, but there is no single duration that applies to every product and mixer. Use the selected pigment’s instructions, establish the plant procedure before the first batch, and keep it unchanged. Do not shorten the mixing cycle on later loads to save time or extend it arbitrarily to chase a different fresh-concrete shade.
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Finish adjacent pours consistently
Wait for bleed water to disappear before final floating or troweling. Use the same tools and timing on adjacent pours. Different finishing timing or treatment can make adjoining areas look different even if their batch proportions match. Avoid calcium-chloride accelerators, which can affect the appearance of colored concrete.
Use an appropriate curing method
Choose a curing compound or sealer approved for colored concrete and apply it consistently. Sika warns against curing colored concrete with plastic sheeting or water spray because those methods can cause mottling and streaking; check the product’s colored-concrete guidance and coordinate curing with the supplier and finisher. Do not switch curing methods between adjacent sections if a uniform appearance matters.
Keep placement conditions comparable
Plan pours so one area is not placed under substantially different conditions from the next. Record the load number, arrival time, weather, slump, water additions, finishing start, finishing completion, curing application, and sealer lot. This log does not make a bad batch uniform, but it helps identify whether a visible change follows a particular load or process decision.
Why is colored concrete streaky or uneven?
Streaks and patches often point to a difference in pigment dispersion, water, finishing, or curing. Use the pattern and the batch history to identify which process changed; do not try to conceal an unexplained variation by adding pigment or water to a later load.
- Streaks or patches within a batch: Check whether the pigment was dosed correctly and whether the product-specific mixing time and sequence were followed. Under-mixing can leave pigment unevenly dispersed.
- A lighter or “washed out” area: Check for extra water, including water added after batching or during finishing. Added water can pale the color as well as alter the mix.
- Different shades between loads: Compare cement type and source, aggregate and sand, pigment-to-cementitious ratio, water, slump, and admixtures. A change in any of these can undermine batch-to-batch consistency.
- Mottling that follows finishing or curing differences: Check bleed-water timing, tools, finishing timing, curing compound or sealer, and whether plastic sheeting or water spray was used.
- Variation despite an apparently correct dose: Compare the whole process with the approved sample, not only the pigment quantity. Color depends on the mix, finish, curing, and sealer; there is no universal color-yield figure that predicts the final result.
For the next batch or pour, return to the approved proportions and procedure and consult the supplier before making a correction. Adding more pigment is not a reliable fix for a shade caused by excess water, incomplete mixing, a different cement or aggregate, or inconsistent curing.
Can you correct a load that looks wrong while it is fresh?
Pause and document the deviation rather than making an improvised correction. Compare the batch ticket with the approved design: cementitious weights, pigment amount and form, water, admixtures, slump, and mixing revolutions. Notify the ready-mix producer and the project decision-maker before adding anything. A truck-side dose of extra pigment may not disperse uniformly, and extra water can permanently change both shade and performance.
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If the load is accepted, place and finish it using the approved procedure, then evaluate the cured result against the mock-up. If it is rejected, follow the supplier’s quality procedure for that load. The important control is to prevent an undocumented correction from becoming the new standard for later batches.
How do you approve the color before a full pour?
Make a test panel using the actual cement, aggregate, pigment, water, finish, curing method, and sealer planned for the work. Approve the cured panel—not just the color of fresh concrete—before production. A sample made with substitute materials or a different finishing and curing process does not establish what the specified mix will look like.
Use the mock-up to settle the desired shade and surface appearance with the project decision-makers. Record the approved pigment product and dosage, mix details, finishing approach, curing product, and sealer. Then give the supplier and finisher the same approved reference and keep the production procedure consistent with it. Direct Colors’ technical data sheet, issued August 19, 2026, is one example of product documentation to consult; the applicable product’s own sheet remains the reference for its dosage and use.
Keep the panel available during placement as a visual reference, but judge it under comparable light and after the same curing period. A wet load, an early-finished slab, and a sealed panel can look markedly different. The cured, sealed mock-up is the useful approval standard because it represents the complete specified process.
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Compare products against the mix and production process you can actually control, not color names alone. Ask the supplier for the technical sheet, color chart, and mixing directions for the specific pigment under consideration.
- Standards documentation: Does the documentation address ASTM C979 for integral concrete pigment?
- Dosage basis and range: Is the dose calculated from cement or a cementitious total, and how does the product direct you to handle supplementary cementitious materials?
- Form and handling: Is it loose powder, a dissolvable bag, or liquid, and can the chosen plant batch it consistently?
- Mixing directions: What sequence and minimum mixing time or revolutions does the product specify?
- Compatibility: What does the manufacturer say about the planned supplementary cementitious materials and admixtures?
- Supply and support: Can the ready-mix supplier obtain the product and repeat the approved procedure? Does the manufacturer offer technical support or sample-panel assistance?
Also compare packaging scale and measuring accuracy. Premeasured integral-color bags can reduce weighing errors when their size matches the batch, while loose powder may suit a plant that already has calibrated weighing and dust-control procedures. Liquid products require their own storage, metering, and sequence instructions. The most convenient package is the one the plant can dose repeatedly, not necessarily the one that is easiest to open on site.
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There is no single correct pigment dose or mixing duration across brands. The best fit is the documented product that the supplier can batch according to its instructions and that produces the approved cured mock-up with your project’s materials and finish.
What should the ready-mix supplier and finisher agree on?
Before ordering, provide the supplier with the approved color, pigment product, dosage basis, batch quantity, required slump, admixtures, placement sequence, and curing product. Ask who will add the pigment, how it will be weighed or counted, and how mixing time or revolutions will be verified. Confirm that the plant can obtain the same pigment for every load; switching brands or forms mid-project can change the color even when the nominal dose looks similar.
The finisher should know that water cannot be added casually to make the concrete easier to place, that bleed water must disappear before final finishing, and that the same tools and timing are expected across adjacent areas. The curing crew should know exactly which compound or sealer is approved and should not substitute plastic sheeting or water spray without written approval from the responsible concrete professional.
What is the practical consistency checklist?
- Use a concrete-specific integral pigment with ASTM C979 documentation.
- Base the calculation on the cementitious quantity directed by the manufacturer.
- Record cement source, aggregates, pigment form and dose, water, slump, admixtures, and batch size.
- Use the selected product’s charging sequence and minimum mixing time or revolutions.
- Reject unplanned water additions and unapproved calcium-chloride acceleration.
- Finish only after bleed water disappears, using consistent tools and timing.
- Cure and seal every section with products approved for colored concrete.
- Compare production to a cured mock-up made with the actual materials.
- Keep batch tickets and placement notes so any shade change can be traced to a process variable.
Frequently Asked Questions
Can I add concrete pigment to a ready-mix truck?
Integral pigment is intended to be batched into concrete, so coordinate the product, dose, and mixing instructions with the ready-mix supplier before ordering. Do not assume a truck-side addition or an improvised mixing sequence will produce the same dispersion as the supplier’s established procedure.
How long should concrete pigment mix?
Follow the product and plant instructions. Published guidance ranges from at least 5 minutes or 100 revolutions to 8–12 minutes or 120–150 revolutions. Sika lists at least 5 minutes and 130 drum revolutions for CHROMIX L and at least 100 revolutions for SikaColor-100 P. These are product-specific figures, not a universal minimum.
How much pigment do I add to concrete?
Use the product’s color chart and calculate from its specified cementitious basis. Davis Colors gives a typical starting range of 1–5 pounds per 94-pound sack of cement and a 10% maximum, but that range is not a recipe for every product or shade. Approve the dose with a cured mock-up.
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Does integral pigment color concrete all the way through?
Because integral pigment is mixed into the concrete rather than applied only as a surface color hardener, the color is distributed through the mix. The visible surface can still vary with finishing, curing, and the mix itself, so a cured mock-up remains the practical color reference.
Does colored concrete look the same wet as it does after curing?
Do not approve the final shade from fresh concrete alone. Make a panel with the intended finish, curing method, and sealer, and judge its cured appearance before the production pour.
The Bottom Line
For consistent colored concrete, use an ASTM C979-documented integral pigment, calculate its dose from the specified cementitious content, and keep materials, water, slump, admixtures, mixing, finishing, and curing unchanged. Follow the product’s exact sequence and mixing requirement, never correct color with unplanned water, and approve a cured mock-up made with the real mix before production.
