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New Concrete Pour Showing Lines And Moisture?

 
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Old 09-02-2020, 07:58 PM   #1
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New Concrete Pour Showing Lines And Moisture?


Had a new garage floor installed; the concrete contractor tore up the original concrete, compacted the sand, put down a plastic vapor barrier, and installed mesh before they poured. Seems that a an area near the apron dried differently as it remained with a moisture look longer and now has lines and some moisture; its been over a month.

What I know, the first delivery was short and this area was based on a separate truck. Also the contractor is stating this is normal and happens from time to time and calls it crazing.

What is everyone's thoughts... is a bad install?, different concrete? Should I have them cut out this section? Or what else as it is ugly to see.
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Last edited by rayp; 09-02-2020 at 08:13 PM. Reason: add pictures
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Old 09-02-2020, 08:01 PM   #2
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Re: New Concrete Pour Showing Lines And Moisture?


Additional pictures

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Old 09-02-2020, 08:06 PM   #3
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Re: New Concrete Pour Showing Lines And Moisture?


Try again to add pictures
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Old 09-02-2020, 11:40 PM   #4
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Re: New Concrete Pour Showing Lines And Moisture?


It's called Discoloration, change in color from pour to pour.
Other factors could be the cause of that also like delayed finishing and hard trowling will almost always darken the surface.
The hairline cracks that you see they also called spider web cracks the most common cause is the quick loss of moisture at the surface of the slab.
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Old 09-03-2020, 12:27 AM   #5
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Re: New Concrete Pour Showing Lines And Moisture?


Also looks like too much water was added.

Both to pour and then to finish.

Pretty common occurence from blow and go concrete guys.
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Old 09-03-2020, 12:35 AM   #6
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Re: New Concrete Pour Showing Lines And Moisture?


So were these guys blow&go guys or bang to bang guys
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Old 09-03-2020, 05:24 AM   #7
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Re: New Concrete Pour Showing Lines And Moisture?


But water is necessary for pouring concrete. I don't think that reason of that is much water.
Concrete gains strength for about a month and at first it needs to be watered. Did the contractor do it?

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Old 09-03-2020, 06:14 AM   #8
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Re: New Concrete Pour Showing Lines And Moisture?


The contractor did ask that we spray some water over the entire floor for a couple of days after the pour; the building is north facing so not much sun exposure to dry to fast. I just question the batch of the second truck and if I should be concerned that it does not do well after about a year.

It's ugly to see so we may go the epoxy route, but then I question if the epoxy will bond well to this area.
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Old 09-03-2020, 06:51 AM   #9
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Re: New Concrete Pour Showing Lines And Moisture?


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Originally Posted by rayp View Post
The contractor did ask that we spray some water over the entire floor for a couple of days after the pour; the building is north facing so not much sun exposure to dry to fast. I just question the batch of the second truck and if I should be concerned that it does not do well after about a year.



It's ugly to see so we may go the epoxy route, but then I question if the epoxy will bond well to this area.
Now you should to let the concrete screed dry. After that, think about the next coating.

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Old 09-04-2020, 03:17 PM   #10
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Re: New Concrete Pour Showing Lines And Moisture?


Looks like they might have had the second truck kick a bit on them, and you ended up with a more polished area in the spot by the door. It's very common for the area by the door to finish before the rest of the floor, getting it to match can be frustrating sometimes.


Structurally, it's likely fine.


Usually the sealer evens out the colors between loads pretty well, provided they finished it all about the same.
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Old 09-04-2020, 03:18 PM   #11
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Re: New Concrete Pour Showing Lines And Moisture?


Quote:
Originally Posted by Contrattacker View Post
But water is necessary for pouring concrete. I don't think that reason of that is much water.
Concrete gains strength for about a month and at first it needs to be watered. Did the contractor do it?

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You don't need to water concrete to get it to cure to design strength. It helps for sure, but not needed.

Most residential contractors just use a cure and seal, same as covering it with plastic for months.
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Old 09-04-2020, 04:21 PM   #12
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Re: New Concrete Pour Showing Lines And Moisture?


My guess is that they added calcium chloride (a cheap accelerant) to the second load so they wouldn't have to wait for the last little bit to set-up before they could finish. I'd also guess that they underestimated the effect of the sun coming into the door opening, and it set faster than they expected, and they ended up "burning" the surface with steel trowels. Obvious "crazing" going on there as well, which is generally just an aesthetic issue, not structural.
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Old 09-04-2020, 07:01 PM   #13
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Re: New Concrete Pour Showing Lines And Moisture?


Thanks all for the feedback; just awful to look at and explain to all who see it. This is what it looks like usually; seems like the moisture stains come and go.

My last question, should I be concerned with the moisture that seems to come and go? I get concerned that that any epoxy covering to hide this ugliness may fail.
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Old 09-04-2020, 07:06 PM   #14
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Re: New Concrete Pour Showing Lines And Moisture?


I bet if you drive on it for a few years you'll never know the difference.


You have to keep in mind that even though one goal of the finisher is to produce a consistent finish on a floor, another goal is to end up with a floor that does it's job for decades.


If it starts to spall after one winter, then you have some issues to deal with, but if it does it's job for years and years, then it's mostly a win.


I wouldn't resort to epoxy just yet, give it some time to weather a bit.

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