Diagonal crack in foundation

[jimtheengineer10]

See the attached picture. This was just poured a couple days ago. Is this structurally ok? The contractor just wants to parge it.

 

[jimtheengineer10]

closer picture

 

[jimtheengineer10]

before parging

 

[Archie264]

That's not a crack; that's imperfect consolidation and possibly a cold joint. It looks like they may have put the concrete nozzle at the peak where those two parged joints come together and just left it there while the concrete flowed out. If that's for the basement of a house you should be ok.

 

[jimtheengineer10]

Yes, it is for a house. You are right, it is not a crack, it is where one truck was empty and they had to wait for another truck. Sorry, I described it bad in my original post.

 

[dik]

as long as it doesn't leak... What type of foundation?

Dik

 

[jimtheengineer10]

8" Concrete wall for a single family home (modular).

 

[TehMightyEngineer]

That mix was a bit dry to begin with, look at all those bugholes. Still, for a basement wall that's nothing I would outright reject. I'd core it a few times to make sure you got a good bond between the pours and also between the parge and the wall concrete. I've had this happen before were there was little to no bond across the cold joint, but thankfully we had enough rebar crossing the joint that we deemed it sufficient. I imagine this basement wall is too lightly reinforced to be sufficient if there is a lack of bonding.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

https://www.facebook.com/AmericanConcrete/

 

[Deadblow]

Is the "honeycomb" also visible on the other side of the wall? What vertical reinforcing is in the wall?

EIT

 

[jimtheengineer10]

There was supposed to be vertical rebar at 48" o.c. spacing and three rows of horizontal rebar.