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How to concrete pigments for colored concrete
When selecting a concrete pigment, be sure to utilize color charts that will offer a close approximation of what customers can expect to achieve in gray or white concrete. For custom pours such as countertop mixes, plaster, stucco, mortar, grouts and other concrete-based products, DCI has found that the colors vary within an acceptable range to the majority of our customers, particularly when correctly adjusted to the specific job requirements.
The pigment needed to achieve a specific color is based on the amount of cement in the mix rather than the total weight of bag. Direct Colors Inc. has also provided a quantity calculator to accurately determine the amount of pigment needed for any project. The tool is designed to calculate for truck pours, custom concrete batches and bags of ready mix concrete.
DCI micro-pigments, particularly the blue pigment, weigh considerably less than standard iron oxide-based pigments. To avoid streaking and pigment float out, the ingredients must be combined DRY before adding any liquid to the mixture.
To determine how much pigment/yard is required for your project, simply multiply the pound rating (see example below) by five to ascertain how much pigment is needed per yard of concrete to achieve the desired color. For smaller jobs, DCI recommends using the custom concrete batches feature on the quantity calculator tool mentioned above.