Concrete Slab Delaminating?
Concrete Slab Delaminating?
(OP)
8" THICK CONCRETE SLAB
w/ 6"x6"-#6/#6 WWM
OVER 8" OF COMPACTED CRUSHER RUN GRAVEL
OVER COMPACTED DRAINAGE FILL
The general contractor and project manager say they hear "hollow" sounds from tapping on the concrete slab with a hammer.
The first thought was that either the gravel or drainage fill was not compacted enough and may have sunk or fallen. The second thought was that the sound sounded higher than 8" deep, and thus, perhaps that concrete delaminated.
Has anyone had experience with delaminated concrete? Does this make sense? Any thoughts?
Thank you!
w/ 6"x6"-#6/#6 WWM
OVER 8" OF COMPACTED CRUSHER RUN GRAVEL
OVER COMPACTED DRAINAGE FILL
The general contractor and project manager say they hear "hollow" sounds from tapping on the concrete slab with a hammer.
The first thought was that either the gravel or drainage fill was not compacted enough and may have sunk or fallen. The second thought was that the sound sounded higher than 8" deep, and thus, perhaps that concrete delaminated.
Has anyone had experience with delaminated concrete? Does this make sense? Any thoughts?
Thank you!






RE: Concrete Slab Delaminating?
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Concrete Slab Delaminating?
https://www.youtube.com/watch?v=aoYDp1oa00M
As for your specific situation, I'll leave that to some of my betters to diagnose. It sounds [heh, heh] like you're on the right track, though.
RE: Concrete Slab Delaminating?
Lack of subgrade compaction would not create this issue. Further, finding delaminations is tricky, particulary in slabs on grade. Don't believe the findings unless you can corroborate.
RE: Concrete Slab Delaminating?