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Old 01/09/2008, 04:54 PM   #1
Norboo
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Does anyone know about concrete flooring?

I poured some concrete to a small section 8’ x 10’ to level the floor over two months ago and it is very dusty still. I cover it with floor epoxy and it is peeling right off. Is there anything I put down to harden the concrete or cover it so it won’t so be dusty?

Thank you.


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Old 01/09/2008, 05:29 PM   #2
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What type of concrete and how did you mix it?


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Old 01/09/2008, 05:35 PM   #3
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Down to the detail of the instructions on the packaging. Forget which kind, self leveling.


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Old 01/09/2008, 05:39 PM   #4
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That's really weird cause concrete should never be dusty after its mixed. I mean, you add the water, it should be "wet" for probably about 2-3 hrs, it gets hard, and that's it, should never be dusty.


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Old 01/09/2008, 05:55 PM   #5
H20ENG
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Is it chalky all the way through? If it was a thin coat and it was allowed to completely dry too fast, then it would be brittle.


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Old 01/09/2008, 05:58 PM   #6
brucem
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did you acid etch it before you put the epoxy. Usually you need to rough up the concrete before you put the epoxy down


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Old 01/09/2008, 06:20 PM   #7
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As H20ENG mentioned, if the concrete is chalky then it dehydrated (it dried too fast). If it was SLC (Self Leveling Compound) then it should almost shine, not be chalky.

How thick was the SLC poured and what did the concrete under it look like? What brand of SLC was it? Did you let it slake as directed (sit for a period of time and them remix)?


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Old 01/09/2008, 06:33 PM   #8
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I know there's been a TON of questions already but how long did you allow this SLC cure before coating it?

Typically concrete/cement is supposed to cure for at least 28 days before anything is applied to it. Some believe that thinner applications do not require 28 days, but I'm a '28 day' believer.


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Old 01/09/2008, 06:43 PM   #9
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month and a half before coating it. it was an epoxy kit that contained acid etch

1" to 1 1/2" thick, not sure of the brand. On the packaging, it did state rotate sock after 6 months…bags looked pretty beat up.


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Old 01/09/2008, 06:44 PM   #10
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is there any harder of some sort? or some sort of coating?


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Old 01/09/2008, 09:06 PM   #11
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Concrete can get dusty if you hard trowel it too early... it weakens the surface. Who did the finishing?


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Old 01/10/2008, 05:43 PM   #12
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Yes, how long did you wait after it was laid to finish the concrete? After floating, you have to let the "bleed water" evaporate. this is all the excess water in the concrete that wasn't used for hydration. If you do not let it evaporate, and work it into the surface, then it is greatly weakened.


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