What is a clamping plate

New house concrete slab foundation cracks

I'm building a new house in North Texas. It has been 17 days since the foundation was poured. I live near the construction site so I went 2-4 times a week. Today I was finally able to go inside as it now has a roof (no shingles yet). I noticed a crack in the foundation that goes almost side to side, maybe 1/16 wide, as well as a missing chunk on top. The rest I noticed very few small hairline cracks and the sides and edges look good. I wonder if I should be worried about this.

I will discuss this with my site manager / contractor, but wanted to ask here too. I already have a phased inspector but for the pre-pour foundation they poured a day earlier than said and my private inspection wasn't done, just the city inspection. Is this something I should be worried about, or maybe hire a private civil engineer to do it?

Oscar Gomez

Yes, this is a tightening plate. In the last picture the cables can be seen protruding. Not sure if this means they have been cocked or not. It can be seen from this link that this usually happens 3-10 days after watering, it was 17 days.

Ed Beal

Regardless of the type of steel, fiberglass, and post-tensioning cables used, there are two types of concrete: No. 1 the cracked concrete and No. 2 the cracked concrete. Since it's summer and it was hot I would hope the soil was wet when it was poured and kept wet or damp for a few days after it was finished, but otherwise you'll see the two types above.

Oscar Gomez

Thanks, I don't know if the floor was wet when I watered it, but I think it rained 3 days before. On the day of the watering, I walked by in the afternoon and they flattened it with the powered trovel while carrying and throwing water jugs on it. 2 days later it rained. The other times I went by. It was late and no one was there anymore.

Ed Beal

Well, that sounds kind of okay. What were the temperatures? With rain before and after I'd be happy, but I live in Oregon. Temperatures for this time of year are usually lower than my time in basic training and visiting family at this time of year.

Oscar Gomez

The temperature was high in the 80s, 95 maximum at peak, low in the 70s in the morning

Ed Beal

When it gets over 80, I usually leave a sprinkler on for a few days or flood it every day and cover it with plastic. I still have cracks on the really warm days, but less than without water. As long as there was wire mesh / rebar and / or fiberglass in the mix this is fine.

Oscar Gomez

Thanks, I've never seen it covered in plastic so I doubt it happened but it rained. I don't know if the mix contained wire mesh or fiberglass. Is that common? Is there an easy way to tell? I can ask her.