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Old 06-12-2014, 12:22 PM   #16
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Concrete Colorant / Staining Advice Help


If your mixing on site you'll be okay with iron oxide , but good luck finding a redi-mix producer to mix it into a load.

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Old 06-12-2014, 01:50 PM   #17
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Concrete Colorant / Staining Advice Help


The cheapest and worst "pigment" for black in carbon black! - It is just soot that does not really stain and will wear off with exposure.

Iron oxides (and other metallics)are far better because they actually stain the concrete. They are generally available as natural oxides and synthetic oxides (purer and stronger). The synthetics are not readily available to the retail public.

Ready-mix companies try to avoid using them in the truck because of the strength and the resulting washing and cleaning the drums.

In small batches strong tinting oxides are like playing with concrete since the margin of error is small.

In a plant we almost bought pigment by the boat load and had it delivered from a warhouse by the truck load. (20 kilo bags mostly). We had 6000# batches, but also have an alarm bell to tell the man to dump in the pre-measured small bags (automated timed batching and moisture compensation).

Fortunately, the the expectations on color uniformity of poured concrete are not as critical.

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Old 06-12-2014, 04:34 PM   #18
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i don't suppose it matters we did it over 40yrs ago, does it ? hell, the plant's owner laughed when i told him they wanted ANY color at all other than stock,,, back in the day, in our town, you could get conc in any color you wanted as long as it was grey-ish

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Old 06-12-2014, 05:32 PM   #19
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Concrete Colorant / Staining Advice Help


Quote:
Originally Posted by concretemasonry View Post
The cheapest and worst "pigment" for black in carbon black! - It is just soot that does not really stain and will wear off with exposure.

Iron oxides (and other metallics)are far better because they actually stain the concrete. They are generally available as natural oxides and synthetic oxides (purer and stronger). The synthetics are not readily available to the retail public.

Ready-mix companies try to avoid using them in the truck because of the strength and the resulting washing and cleaning the drums.

In small batches strong tinting oxides are like playing with concrete since the margin of error is small.

In a plant we almost bought pigment by the boat load and had it delivered from a warhouse by the truck load. (20 kilo bags mostly). We had 6000# batches, but also have an alarm bell to tell the man to dump in the pre-measured small bags (automated timed batching and moisture compensation).

Fortunately, the the expectations on color uniformity of poured concrete are not as critical.

Dick


Exactly why I said getting someone to mix it will be extremely hard, in a production plant you would need a metering system, because it mostly comes in solution form and it's a bear to keep uniformity, it's why we and the rest of the producers in Chicago refused to use it, but of course you already know this.
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Old 06-12-2014, 07:10 PM   #20
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Concrete Colorant / Staining Advice Help


Here it is not normally added at the plant it is added onsite, with an additional washout charge.
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Old 06-12-2014, 08:30 PM   #21
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Here it is not normally added at the plant it is added onsite, with an additional washout charge.



So do they use it in a dry form??
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Old 06-12-2014, 09:00 PM   #22
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Concrete Colorant / Staining Advice Help


We never used liquids in the concrete products plant in MN because of the storage problems (freezing in the corner of the heated plant, etc.) and the added cost.

The dry is "usually" stronger in tinting strength. I think the readily availble liquids in small amounts (bottles, etc.) are diluted and have water in the solution and an agent added for stability and use. - Make sure the liquids are mixed very well, despite some of the additives. The the dilutions also work for small batches, because good, pure and strong dry pigments would be difficult to dose/batch.

It is a different world of materials to deal with. Much depends on the amount of cement in the mix/batch, but the maximums suggested are about 7 to 10% of the cement weight, but uses are in the range of 1% to 5%.

Thing is that nobody are of the concrete in a warehouse slab, footing or columns, but once it is made "architectural" or exposed, the color variations are in the personal opinion world that have no way to measure the acceptability, unless it is made to be "variable" and given a fancy term like "stained", "mottled" "variable" and so on.

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Old 06-12-2014, 09:40 PM   #23
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Concrete Colorant / Staining Advice Help


The pool guys use liquid Hydro, everyone else uses weighed powder.
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Old 06-13-2014, 03:14 AM   #24
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here most plants use liquid HOWEVER color suppliers are constantly calibrating plant devices,,, its not like the devices're used all the time like sher-wms guess that's why stamped conc folks use different release & accent powders over the grey conc,,, our base color tends to be tan in atl

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