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-   -   Stain mixed with concrete (http://www.diychatroom.com/f105/stain-mixed-concrete-176650/)

BigJim 04-09-2013 08:29 AM

Stain mixed with concrete
 
Soon our church will have a building built, we thought about have the floors sanded and stained after the slab is poured and the building is done, the cost is unreal. Is there a way we can have the dye mixed with the concrete while they pour it or is that a bad idea?

jomama45 04-09-2013 10:35 AM

Yes, with integral color mixed in from the ready mix supplier. I would assume this is fairly large areas of floor, which requires a little more attention. The contractor really should lay out the pours based on natural breaks in the building floor plan, and the mix needs to stay about the same slump/consistency the entire pour to ensure minimal color variation. Adding just a gallon or two of water to the last few yards of concrete in a mixer can change the color noticeably.........

Canarywood1 04-09-2013 05:33 PM

Quote:

Originally Posted by jomama45 (Post 1155361)
Yes, with integral color mixed in from the ready mix supplier. I would assume this is fairly large areas of floor, which requires a little more attention. The contractor really should lay out the pours based on natural breaks in the building floor plan, and the mix needs to stay about the same slump/consistency the entire pour to ensure minimal color variation. Adding just a gallon or two of water to the last few yards of concrete in a mixer can change the color noticeably.........



I thought that stained floors could only be done on cured concrete, have they advanced that much that it's now possible to mix in at the plant???

BigJim 04-09-2013 08:39 PM

Thanks JM, I didn't realize it was that touchy, oh well, back to the drawing board.:)

Mort 04-09-2013 08:40 PM

We haul colored concrete quite a bit. Usually it's a liquid color added before loading the concrete in the truck.

We even did a bright purple for a local high school. Mostly, though, it's silver, black, or earth tones.

It isn't terribly expensive, and at least with my company, if you get 3 yards per load or more, we guarantee a color match if more than one truckload is required.

Canarywood1 04-09-2013 08:59 PM

Quote:

Originally Posted by Mort (Post 1155715)
We haul colored concrete quite a bit. Usually it's a liquid color added before loading the concrete in the truck.

We even did a bright purple for a local high school. Mostly, though, it's silver, black, or earth tones.

It isn't terribly expensive, and at least with my company, if you get 3 yards per load or more, we guarantee a color match if more than one truckload is required.


Color has been around forever,OP was asking about stain,and jomama said it could be added at the plant,and i thought it was only done on cured concrete.

stadry 04-09-2013 09:13 PM

floors sanding is done to ' break the glaze ' that results from having the conc ' burned ' or power trowel'd,,, in order for the stain to work better, it needs to react w/the free lime in the concrete's cement,,, breaking the glaze uses up too much of the acid so that's why we hit it w/floor machines ( lo-speed swing buffer or oscillating ),,, you certainly ought to be able to do that yourself,,, it you want acid-stain, its not expensive UNLESS you buy the cheap stuff ( stay outta sher-wms & the apron/vest stores ),,, find a source/supplier who actually KNOWS acid & how it works,,, i don't know how you define ' unreal ' but here in atl any sizeable job goes for $2.50sf incl labor, mtls, profit, etc.

mixing dyes @ the plant is NEVER done,,, plants DO use wtr-soluble pigments ( solomon color's a big supplier as is schofield & butterfield,,, there are so many factors which affect color & crey conc IS a color,,, where the cement in the silo is 1, flyash added, cement supplier, water/cement ratio, weather @ the time of placing/finishing, sunlight @ time of placing/finishing, curing - just too many factors to list,,, even regular conc will vary shades w/same mix design,,, plan on NO 2 loads being the same color.

that being said, you notice decorative conc artisans rarely use constant color shades,,, there's usually something to ' break ' the color to our eyes,,, speak of which, color changes depending on which eye 1 uses,,, but, for purposes of answering your question, IF you can live w/varying shades of color, go for it,,, just don't anticipate the final appearance will be uniform in color. ps - you'll also need to have CLOSE cooperation between the plant, genl contractor, conc sub, AND a knowledgeable dec conc artisan
:thumbup:

concretemasonry 04-09-2013 09:51 PM

If you want uniform color that is permanent you have to have the pigment batched in to the mix with the cement and aggregate. Even the sequence of batching and mixing the different materials makes a difference.

Real concrete producers use only synthetic oxides (not cheap) and not the aniline liquids/dyes that are not as permanent or carbon blacks that do break down with abrasion and mixing. Iron oxides (reds, yellows, tans, browns and black) are available in a multitude of blends, but only in large amounts to producers. Chrome oxides can be used for greens, blues or combined with other pigments (not dyes). - All of these are synthetic oxides (purified or heat for color tints) and not natural oxides that contain many impurities and salts.

If you get synthetic oxides on you they will not wash off easily (even if quickly) and just have to let the pigment wear off as your skin wears off with time.

Dick


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