Concrete Discoloration - Masonry - Contractor Talk

Concrete Discoloration

 
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Old 08-23-2019, 11:47 PM   #1
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Concrete Discoloration


My concrete guy poured this back on June 13th. Most bleached out but I have dark spots that still look like this. Is there something wrong or do I need to keep waiting for the dark to bleach out? I’ve seen slight improvement week over week, but only slight. The photo was taken in the evening so the dark areas may show darker than in person.
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Old 08-24-2019, 12:02 AM   #2
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Re: Concrete Discoloration


Looks like inconsistent base.


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Old 08-24-2019, 12:04 AM   #3
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Re: Concrete Discoloration


I've also found pouring with 3000 psi helps tremendously with color consistency. More cement makes for a better finish. It's a cream thing.


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Old 08-24-2019, 12:15 AM   #4
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Re: Concrete Discoloration


It was 3000 psi. Any suggestions to fix or will that come with time?
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Old 08-24-2019, 09:24 AM   #5
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Re: Concrete Discoloration


Well, it wont stay that dark forever, but it probably won't even out the way you want. Is there plastic under it?
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Old 08-24-2019, 10:13 AM   #6
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Re: Concrete Discoloration


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Well, it wont stay that dark forever, but it probably won't even out the way you want. Is there plastic under it?
No plastic underneath
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Old 08-24-2019, 11:23 AM   #7
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Re: Concrete Discoloration


Was it troweled with a power trowel ? If you put a real hard finish on with a machine,you can actually turn the entire finish gun metal blue.
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Old 08-24-2019, 04:17 PM   #8
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Re: Concrete Discoloration


Is it a hard troweled finish? Looks like it got burned in those spots, but I've never seen one get burned so splotchy like that.


I try to get most of my floors that blued steel color, but typically it all goes at around the same time.
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Old 08-24-2019, 04:19 PM   #9
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Re: Concrete Discoloration


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I've also found pouring with 3000 psi helps tremendously with color consistency. More cement makes for a better finish. It's a cream thing.


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4000 is my favorite, lots of cream to work with, but not so much that the load is unpredictable in how fast is is going to get warm on you.
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Old 08-24-2019, 11:29 PM   #10
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Re: Concrete Discoloration


Really poor sealer job....

Form oil spillage from raise elevation form work??

Was higher island poured after stained portion?

Contaminated concrete?

dirty hose water, hard water stain...

Water soluble contamination under slab...

Oiled rebars/ mesh?

oily finish tools, leaky two stroke gas tank....

Vandalism. Or enemy action?

Dirty blankets? burlap?

Contaminated garden sprayer tank used for sealer with out clean out of stain or other chemical(s).

Hydraulic oil spill from "cement" truck....over oiled concrete buggies/wheelbarrows. Spill at concrete plant/ quarry. Rock truck...

Buy the foremen a case of Beer and ask WTF happened to my concrete?????
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Last edited by Fouthgeneration; 08-24-2019 at 11:31 PM.
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Old 08-25-2019, 02:46 AM   #11
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Re: Concrete Discoloration


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Originally Posted by NYCB View Post
Is it a hard troweled finish? Looks like it got burned in those spots, but I've never seen one get burned so splotchy like that.


I try to get most of my floors that blued steel color, but typically it all goes at around the same time.
It’s broom finish
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Old 08-25-2019, 02:52 AM   #12
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Re: Concrete Discoloration


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Originally Posted by Fouthgeneration View Post
Really poor sealer job....

Form oil spillage from raise elevation form work??

Was higher island poured after stained portion?

Contaminated concrete?

dirty hose water, hard water stain...

Water soluble contamination under slab...

Oiled rebars/ mesh?

oily finish tools, leaky two stroke gas tank....

Vandalism. Or enemy action?

Dirty blankets? burlap?

Contaminated garden sprayer tank used for sealer with out clean out of stain or other chemical(s).<img src="http://img.contractortalk.com/smilies/thumbsup.gif" border="0" alt="" title="Thumbsup" class="inlineimg" />

Hydraulic oil spill from "cement" truck....over oiled concrete buggies/wheelbarrows. Spill at concrete plant/ quarry. Rock truck...

Buy the foremen a case of Beer and ask WTF happened to my concrete?????<img src="http://img.contractortalk.com/smilies/icon_wink.gif" border="0" alt="" title="Wink" class="inlineimg" />
Sounds like there are many variables to consider.

It was all poured the same time, the raised pad is fine. It had some minor blotching but pretty much has faded completely away. The larger areas are what scare me. In those, there has been some fading away/bleach out, but slowly. My guy says it happens sometimes and I just have to give it time but 60+ days? I’m not sure if I just be patient and what happens or what to do next?
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Old 08-25-2019, 09:04 AM   #13
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Re: Concrete Discoloration


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Itís broom finish
Like was said above, did form oil get spilled all over it?

I've never seen discoloration like that on concrete that hasn't been burned, except when contaminated with something.
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Old 08-25-2019, 09:09 AM   #14
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Re: Concrete Discoloration


Quote:
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....My guy says it happens sometimes and I just have to give it time but 60+ days? Iím not sure if I just be patient and what happens or what to do next?
Why? WTF do you think is going to happen?

Are you expecting giant lizard creatures to jump out of it?
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Old 08-25-2019, 09:32 AM   #15
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Re: Concrete Discoloration


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Quote:
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It’s broom finish
Like was said above, did form oil get spilled all over it?

I've never seen discoloration like that on concrete that hasn't been burned, except when contaminated with something.
Not that I’m aware of.
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Old 08-25-2019, 09:35 AM   #16
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Re: Concrete Discoloration


Quote:
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Quote:
Originally Posted by Wezal15 View Post
....My guy says it happens sometimes and I just have to give it time but 60+ days? I’m not sure if I just be patient and what happens or what to do next?
Why? WTF do you think is going to happen?

Are you expecting giant lizard creatures to jump out of it?
I’m hoping it bleaches out and doesn’t look like crap. Posted seeking help for a root cause and a solution to have this fixed and look normal if it won’t just heal with time. If giant lizards pooped out of it that would be interesting &#x1f602;
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Old 08-25-2019, 09:43 AM   #17
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Re: Concrete Discoloration


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Iím hoping it bleaches out and doesnít look like crap. Posted seeking help for a root cause and a solution to have this fixed and look normal if it wonít just heal with time. If giant lizards pooped out of it that would be interesting &#x1f602;
It's **** ing concrete. There's nothing to "heal".

You talk like a DIY homeowner. I will treat you as one.
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Old 08-25-2019, 10:06 AM   #18
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Re: Concrete Discoloration


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Quote:
Originally Posted by Wezal15 View Post
I’m hoping it bleaches out and doesn’t look like crap. Posted seeking help for a root cause and a solution to have this fixed and look normal if it won’t just heal with time. If giant lizards pooped out of it that would be interesting &#x1f602;
It's **** ing concrete. There's nothing to "heal".

You talk like a DIY homeowner. I will treat you as one.
It’s ****ing concrete with dark spots that I’m looking for root causes and solutions to address. Not that you contributed to that but no need to be a jerk.
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Old 08-25-2019, 03:02 PM   #19
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Re: Concrete Discoloration


Howís the slope on that slab? If it was wetted down right after pour and the water puddled for awhile, thatís a common reason for discoloration.


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Old 08-26-2019, 05:24 AM   #20
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Re: Concrete Discoloration


I was called to look at one, similar to this. It was poured about a year ago. There is a little white, but mostly still dark blue. It has a burned finish.
It's a garage floor.

In that case, I suspect a hot load of concrete. They got the concrete from a plant, at least an hour away, by car. I'll bet that concrete was in the truck for 1 1/2 hours, before pouring.
The floor also has stress cracks around the perimeter. A crack runs toward the center, only about 8", but the cracks are less than 12" apart. That's alot of cracks.
It should have been white, by now.

So, having said all of that, is there a chance the load was hot.

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