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New concrete pool deck cracking

1020 Views 9 Replies 4 Participants Last post by  bob22
Poured 2100 SF 24 days ago. Started noticing hairline cracks, near the skimmer and a a couple in other places. They put 5" of compacted CAB road fill down, rebar 24"on center, the slab is 4-5" thick, 3500 psi concrete. They said they pump at a 6 slump. Could find nobody that would do a 5 slump.

The control joints were tooled in at 8ft, basically 8ft squares. There are hairline cracks in many of the control joints, but it seems the concrete had other thoughts. So is this just life with concrete? Not sure what else I could have done here. It's been almost 4 weeks, and most of it is still pretty dark grey and blochy. There are also some spots that I don't think we're finished that well but I may just be too picky. They did leave a 8x7 slab that is pooling 1/4" of water, they agreed to demo and repour that piece, I assume since it against a new wall they can demo it without damaging the slab it's connected too and the wall? So how do they deal with the fact the rebar in the repour will not be connected to the piece next to it?

Sorry for all the questions but I still need to pour another 1000 ft in the front. I would like to avoid similar issues.

Thank you
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1st guess is an insufficient jnt pattern OR improperly installed jnts ( time / place ),,, when they demo, leave the rebar in place - your slabs will still be connected altho i can't imagine why you'd want that,,, impo, ixnay on rebar across a joint held by conc on both sides,,, both liquids AND solids change dimensions due to changes in temperature ( hy skoul fizix, remember ? )
ok, i'll bite - what is a ' pool bonding system ' ???
conc pool aprons/decking aren't part of the pool & are separated by expansion joint material ( or should be ), no ?

in any event, no steel should be attached into both slabs across a joint,,, grease 1 side so it can slide/move as conc expands/contracts
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