Red Spots On New Concrete??? - Masonry - Contractor Talk

Red Spots On New Concrete???

 
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Old 02-18-2013, 10:09 PM   #1
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Red Spots On New Concrete???


I'm hoping someone has experience the same problem and can help out. I recently poured a slab in a back yard, less than three weeks ago and have been told by the owner of the home that "RED SPOTS" have developed on the surface of the slab. I have read around the web that it could be the reinforcing agent or the mesh wire should I say that is corroding. Has any one encounter a problem like this? Or could it be any thing else? Is there anything that can remove these red stains or spots?
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Old 02-18-2013, 10:14 PM   #2
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Re: Red Spots On New Concrete???


I doubt you are having oxidation problems from your reinforcing unless it is not set deep enough.

Did you pour over red clay? or were there any other job site contaminants around?

Was it a one load drop from the batch plant?

Perhaps you got a contaminated load of mud.

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Old 02-20-2013, 12:20 PM   #3
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Re: Red Spots On New Concrete???


Pictures could help tremendously!
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Old 02-20-2013, 09:32 PM   #4
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Re: Red Spots On New Concrete???


Any leaves fall in it while you were screeding?
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Old 02-21-2013, 06:46 PM   #5
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Re: Red Spots On New Concrete???


did u use rebar or mesh reinforcement? maybe it could be rust if you had placed the rebar too close to the finished surface
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Old 02-21-2013, 06:55 PM   #6
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Re: Red Spots On New Concrete???


Quote:
Originally Posted by ebautista88
did u use rebar or mesh reinforcement? maybe it could be rust if you had placed the rebar too close to the finished surface
We used mesh wire, and very few to little dobe's were used. From what I've been reading it does sound like its rust, have any idea how to remove it without harming the surface of the slab? Also once it's removed will it come back? Thanks

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Old 02-21-2013, 06:59 PM   #7
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Re: Red Spots On New Concrete???


Quote:
Originally Posted by JGCConcrete View Post
We used mesh wire, and very few to little dobe's were used. From what I've been reading it does sound like its rust, have any idea how to remove it without harming the surface of the slab? Also once it's removed will it come back? Thanks

Attachment 87607
If it is in fact rust coming from within, removing the stain isn't going to keep the rusting metal from coming right back. And, if it is in fact rust coming from within, an epoxy might seal it under.
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Old 02-21-2013, 07:06 PM   #8
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Re: Red Spots On New Concrete???


Quote:
Originally Posted by Mooman

If it is in fact rust coming from within, removing the stain isn't going to keep the rusting metal from coming right back. And, if it is in fact rust coming from within, an epoxy might seal it under.
An epoxy? Any kind you can recommend? Most importantly what would be the process of applying?
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Old 02-21-2013, 08:02 PM   #9
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Re: Red Spots On New Concrete???


While I'm not going to recommend any one product, (because my suggestion was simply an idea), and not based on personal experience. I will say that I am positive at least one of the pros hanging out in this forum knows of something you can try. Also, I have been reading up over the last year about this company.........Give them a look, and do your research.
http://www.westcoat.com/
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Old 02-21-2013, 08:06 PM   #10
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Re: Red Spots On New Concrete???


Are you sure you didn't spill coffee on it? Lol
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Old 02-21-2013, 08:59 PM   #11
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Re: Red Spots On New Concrete???


If you poured over some muddy water it would look like that.
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Old 02-21-2013, 09:07 PM   #12
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Re: Red Spots On New Concrete???


Quote:
Originally Posted by mart4005
If you poured over some muddy water it would look like that.
I think you're right, that's what it looks like to me.
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Old 02-21-2013, 09:07 PM   #13
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Re: Red Spots On New Concrete???


Quote:
Originally Posted by mart4005
If you poured over some muddy water it would look like that.
Is there a way to get rid of that?
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Old 02-21-2013, 09:09 PM   #14
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Re: Red Spots On New Concrete???


Not really. Did you pour over muddy water?

You could acid etch it and then stain it.
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Old 02-21-2013, 09:13 PM   #15
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Re: Red Spots On New Concrete???


Quote:
Originally Posted by QCCI
Not really. Did you pour over muddy water?

You could acid etch it and then stain it.
I do recall wetting it down pretty heavy the day before
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Old 02-21-2013, 09:18 PM   #16
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Re: Red Spots On New Concrete???


Just pressure wash the thing and get back to us.
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Old 02-21-2013, 11:06 PM   #17
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Re: Red Spots On New Concrete???


Found another in my list...
http://www.super-krete.com/vCategory.aspx?ID=20
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Old 02-22-2013, 01:21 AM   #18
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Re: Red Spots On New Concrete???


Every time i have poured, i wet the dirt and never had that happen then again I make sure its not wet like a puddle..how long ago did u pour it? U can power wash it or acid wash it ... If anything u can always stain it like other members mentioned
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Old 02-22-2013, 02:49 AM   #19
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Re: Red Spots On New Concrete???


Quote:
Originally Posted by ebautista88
Every time i have poured, i wet the dirt and never had that happen then again I make sure its not wet like a puddle..how long ago did u pour it? U can power wash it or acid wash it ... If anything u can always stain it like other members mentioned
Going on close to 5 weeks now since it was poured. I am going to pressure wash it and see from there.
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Old 02-22-2013, 05:55 AM   #20
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Re: Red Spots On New Concrete???


Sometimes the concrete truck was used for a dye job & the truck was not cleaned well or at all. Even if it was cleaned the dye hangs up on the blades & instead of mixing completely into your batch it just gets slightly mixed with your Crete & just sits on top. The first time it gets wet it bleeds. Contact your local concrete tool, forms, & cure/ seal provider ( Euco ) for a good product.

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