Question regarding small hole in new slab

[leafman92]

Hey there. New to the forum but have lurked for a bit. I recently had a slab poured for a 24x24 garage. Its been done for 3 weeks or so now waiting to build on. I noticed two small holes and i'm wondering how should I address them or what I should say to my contractor. Don't know much about concrete. I know cracks can be a normal thing but not sure about what these holes are. Attached some photos. Would appreciate any input. Thanks

 

[Walkers]

I found a handful of those in my concrete. Turned out to be where the finisher spit is spearmint gum. If I ever encounter him again I am going to put his pack of gum somewhere that he won't want to chew it anymore!

 

[vavet]

Have the walls been framed? The guy who framed my garage shot a couple nails into the concrete floor to hold the diagonal braces up for the walls.
I didn't love it, but ultimately, it doesn't change anything for a functional garage.

 

[leafman92]

The walls haven't been framed yet. I was more or less just concerned about the integrity of the slab

 

[pattenp]

Small dry clumps of concrete that didn't get mixed well. It's not unusual.

 

[Rusted Nut]

Looks to me like the base was uneven. The base was high in those spots, and you only have a couple inches of concrete cover at best. Did the same contractor both prep the base and pour? If so, have them fix it. Otherwise break out the thin/weak areas and patch.

 

[The Cobbler]

I'm wondering if the finishing machine hit a few stones . jarred them and thus the voids

 

[ConCretin]

Those are probably rocks that were dislodged and moved slightly during power troweling. It's not terribly unusual and not a structural issue but it does speak to poor finishing technique. After screeding the floor, a bull float should be used to push down the course aggregate and bring up the some paste. This didn't occur for some reason. Once again, not too big a deal. Just patch them and enjoy your new floor.

 

[bluedog225]

Yep. Patch and move on. Just a moved stone.