Recommendations for the Contractor Using Colored Ready Mix


For colored and uncolored concrete, follow similar procedures used regarding base preparation, use of vapor barriers, plus placement of forms, reinforcement and joints. Here are some additional guidelines that should be observed for colored concrete.

• Be sure to use an experienced ready mix supplier who consistently follows the recommendations provided above.


• Do not sprinkle dry concentrated pigment (either powders or Bayferrox C granules) onto the surface of "green" concrete.


• Give yourself enough time and adequate labor to do the job right.


• Stop floating the concrete when surface becomes wet. Then begin troweling after bleed water evaporates. If you wait too long, burns or dark spots are likely.


• Avoid adding extra water at the job site. Also, don't wet finishing tools or sprinkle any water onto the surface of the colored concrete.


• Final finishes, such as broom, swirl, rough or imprinting, usually result in a more uniform color appearance than smooth surfaces.


• Do not fog or cover final project with plastic sheets. This creates uneven colors.


• Curing compounds are recommended but extreme care must be taken in their selection and application. Also, surface retarders during finishing may be necessary in dry, windy weather. For both products, consult your local ready mix concrete or admixture supplier for information on products recommended for colored concrete.


• Efflorescence is a naturally occurring phenomenon. It is that white powdery substance that may occur on the surface of concrete, and is more visible especially on colored concrete. Sometimes the whole project looks lighter due to an even layer of efflorescence. Other times, it occurs in spots or in areas around the edges where faster setting occurred. If efflorescence happens, care should be taken for its removal. Use a reputable product and follow manufacturer's recommendations carefully, using all safety precautions.

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