Do you know if blue pigment slows down concrete curing? I did some samples the other day and 24 hours later were wet and grinding showed a lot of agg. Saw something similar at an Ardex training where cement topping was tinted with blue liquid color and lasted a day or so before hardening. That stuff hardens in 3 hours and you can walk over it.

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Key is to not assume that all pigments will have the same impact on the water to cement ratio. Pigments have particle size distribution differences and particle shape differences that affect the properties of concrete due to these differences AND as saturation levels are approached for each type of pigment.
An 8 % loading of Yellow Oxide used at a set W/C ratio vs 0.2 % Carbon Black - Carbon will behave quite normally vs the high dose Yellow "traditional" Oxide - w. everything being equal.
Yes some Blues will affect cure times at higher loadings if water is not compensated. To say exactly how much is very dependent on mix design. Bright Red Liquid color at high loading can impact total water and reduce demand by over 20 %.
Thanks for the input Murray. This is very valuable information to us but unfortunately does not seem to be readily available unless you are in the pigment industry. It would be nice to know how some of the pigment properties affect mixes before we dose them. I would imagine the very high end pigment suppliers would have this information on the label. Especially the max dosage recommendations.

Clients and I have noticed your yellow oxide to produce a slight green even in a white base at lower loads (0.5%) I have been putting in some ti white to help control this. I do not know if your oxide is "traditional" or if you recommend another type of pig to eliminate the greenish hue.

Murray Clarke said:
Key is to not assume that all pigments will have the same impact on the water to cement ratio. Pigments have particle size distribution differences and particle shape differences that affect the properties of concrete due to these differences AND as saturation levels are approached for each type of pigment.
An 8 % loading of Yellow Oxide used at a set W/C ratio vs 0.2 % Carbon Black - Carbon will behave quite normally vs the high dose Yellow "traditional" Oxide - w. everything being equal.
Yes some Blues will affect cure times at higher loadings if water is not compensated. To say exactly how much is very dependent on mix design. Bright Red Liquid color at high loading can impact total water and reduce demand by over 20 %.

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