Concrete Cracking

[Rabbit12]

See attached picture.

We have a product where we place two slabs; one on grade and one elevated. The slab on grade was cured with a cure and seal product while the elevated slab was flooded after finishing. Both slabs have cracked like you can see in the picture. To me it appears to be craze cracking, but the distance between cracking is 2'-3'. Am I correct in thinking this is craze cracking?

If it is craze cracking it's likely this was an issue with the finishing process or with the concrete mix. Since these are both exposed interior slabs is there anything that can be done to "fix" these? I'm confident they aren't structural deficiencies, but I'm sure our owner won't like cracks like this in his new slabs.

 

[ShawThing]

Yes, appears to be craze cracking. Usually associated with early surface drying of the concrete. Was the concrete poured on a hot or windy day?
Not sure what can be done about it. Coating the concrete may make the cracking more obvious.

 

[MIStructE_IRE]

Agreed, looks like surface crazing to me. Judging by the look of that sun beating down in your photograph its most likely due to rapid drying. Very little you can do now i. My experience.

Have you got some control joints in the ground bearing slab? Were these cut prior to cracking?

Non structural, but unfortunate on exposed surfaces.

 

[Rabbit12]

@ShawThing

The weather the day of the pour was almost perfect. Started about 7 am with temps in the high 60's started finishing the slab between 11 am and noon. High for the day was around 80. It was sunny but no wind to speak of.

@MIStructE

We don't have any control joints. The slab is actually designed as a structural slab; the soils below the slab aren't good and settlement is expected over the life of the structure. We expected some plastic shrinkage cracking becuase of the lack of control joints, but this is far beyond what anyone expected.

Would an epoxy paint be an acceptable way to cover these cracks?