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Unconsolidated Concrete

 
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Old 09-21-2016, 05:56 PM   #1
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Unconsolidated Concrete


Pulled the forms today and found this. Concrete guy told me that it didn't consolidate because the second truck was too dry. I'm thinking maybe he forgot to drop the vibrator here? Any cause for concern?
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Old 09-21-2016, 06:42 PM   #2
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Re: Unconsolidated Concrete


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Originally Posted by bwiab View Post
Pulled the forms today and found this. Concrete guy told me that it didn't consolidate because the second truck was too dry. I'm thinking maybe he forgot to drop the vibrator here? Any cause for concern?
Slight omission could result in a portion of wall having insufficient cement bonding the aggregate together and this is the result ... If you see the same on the other side, you could have a structural issue, or depending how deep this is, the first hydrostatic movement or any lateral force could cause a structural crack.Also something like this tends to leave patches of porous concrete and you might have water seepage down the road.
Hard to tell from a picture but in some cases I would suggest talking to a structural engineer and have him evaluate the situation... If it was my call I would suggest using epoxy injection plugs and see if that crack can be filled and use carbon fiber staples 12" OC along entire crack to make a structural repair (needed/or not) just to make sure that portion of the foundation wall is reinforced.

Good luck

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Old 09-21-2016, 07:24 PM   #3
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Re: Unconsolidated Concrete


Hey greg, I'm not tryin' to be a wise-ars, I'm honestly asking.
Would it be cheaper to just replace it? And done right.?
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Old 09-21-2016, 07:37 PM   #4
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Re: Unconsolidated Concrete


Looks more like a cold joint.

Liability wise may be best to have a SE evaluate it and make a recommendation.
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Old 09-21-2016, 07:39 PM   #5
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Re: Unconsolidated Concrete


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Looks more like a cold joint.

Liability wise may be best to have a SE evaluate it and make a recommendation.
Looks like a cold joint to me as well. Was there a long wait between trucks? Did you vibrate it?
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Old 09-21-2016, 08:05 PM   #6
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Re: Unconsolidated Concrete


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Hey greg, I'm not tryin' to be a wise-ars, I'm honestly asking.
Would it be cheaper to just replace it? And done right.?
It can be done many ways, depends who is willing to pay and what they wanna spend, also who is liable, is this structural or not, it could be nothing also for all we know, or it could be something.

They have to get a contractor, engineer, the owner, maybe concrete representative, and see who is at fault, and come up with a remedy.
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Old 09-21-2016, 09:21 PM   #7
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Re: Unconsolidated Concrete


Well I freaked out and ran back down to the jobsite to inspect it closer myself. Definitely appears to be a cold joint. Don't know what happened. Guys were vibrating regularly far as I could tell. Trucks were always two deep. I filmed the first truck and the concrete was flowing great. I feel pretty confident that this is not a structural issue. There is continuous bearing across the joint. Two minor cavities at a form tie. Will probably get the SE to review anyway. That being said, what does this do for my waterproofing? We were planning on doing one coat of the black stuff. Should I grout this first?
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Old 09-23-2016, 06:51 PM   #8
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Re: Unconsolidated Concrete


That is definitely a cold joint. In a flat work job you can usually make it look a little prettier by going out on the concrete and working the new into the old. In a wall that's not possible. Cold joints can be a defect if the first load of concrete was too cured to bond to the second/newer load. Hard to tell by looking at it though. The joys of concrete.
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Old 09-24-2016, 03:30 PM   #9
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Re: Unconsolidated Concrete


Cold joint, not going anywhere just looks a little ugly. Have him patch it, no need for concern IMO.

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