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Concrete Additives, Admix, Color
Pouring Color Concrete for Decorative Projects
The most important consideration when adding color to your concrete is
consistency. Decorative concrete is used for aesthetics and requires more skill to
place than regular concrete. It is essential that the contractor uses the same
material and process throughout the pour to achieve an even appearance.
Mix
The strength of the mix needed is determined by the project type and
intended use. Different strengths do not affect color, but using a standard mix with fly ash will. Fly ash is a by-product of coal burning plants. This by-product will always have slight variations of color and residue. The variation doesn’t impact the strength because it’s a filler, but it can have a huge impact on the outcome of color.
If you are using color, it is highly recommended that you choose a cement only
mix. The cost is slightly higher, but when looks are important, this is not where you should cut costs. It will cost substantially more to rip out and re-do the concrete if the fly ash causes an uneven appearance.
Consistency
Consistency is crucial when using color. Color concrete needs to come from
the same plant for the entire pour. Cement and Aggregates can differ even in close locations and even slight variations can impact color.
Things to keep in Mind:
• Color concrete, just like painting your home, should be completed on the
same day. Environmental changes like heat and humidity that differ daily can
cause your color to be uneven.
• Water should never be added to the jobsite. Even a few gallons will dilute the
color. Extra water also includes the water on brooms and hand tools used
when finishing or added to the surface for curing.
• If pouring in cold weather, never use a chloride accelerator as this will also
cause uneven color.
• Metal finishing tools are not recommended. Wood or plastic will give a much
better result.
Testing
Testing the first load of color concrete is essential. If there are any issues
with slump or air-entrainment, they need to be address and corrected before the
concrete is poured so the next load can be adjusted to maintain consistency.
Consistency is vital in achieving a great looking decorative concrete project
Pouring_color_concrete_for_Decorative_Projects.pdf
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