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split slab concrete parking deck

split slab concrete parking deck

split slab concrete parking deck

(OP)
I have a split slab parking deck project in northern climate. It is a steel framed floor with a reinforced concrete slab. A waterproof membrane was adhered to the slab then protected by a protection board and a 3" concrete surface topping. The topping has caulked saw cut joints at 7' on center each way. The entire system slopes at 1/4" per foot to multi level drains. The construction is 7 years old. The concrete topping is cracking all over and spalling. The topping has observed cracking days after initial placement. The argument is that a drainage board was not specified or provided. We have multiple parking deck projects in northern climates that are much older without showing concrete topping damage. Does anyone have parking projects that utilized this type of system successfully (split slab with membrane, without drainage board)? Is there any national standards or research that I can reference?
Thanks

RE: split slab concrete parking deck

What type of protection board? if soft, then 3" topping may crack due to displacement.

May have been further ahead using a membrane and traffic surface...

Dik

RE: split slab concrete parking deck

(OP)
No, it was a hard protection board.

RE: split slab concrete parking deck

Photos of the deck would be helpful. Might be a bad mix.

In Russia building design you!

RE: split slab concrete parking deck

Was the topping reinforced?

"We shape our buildings, thereafter they shape us." -WSC

RE: split slab concrete parking deck

(OP)
Sorry, no pictures.
No the topping was not reinforced.

RE: split slab concrete parking deck

Not even for T&S?

In Russia building design you!

RE: split slab concrete parking deck

Any idea of the concrete mix design, strength, slump, etc?

Dik

RE: split slab concrete parking deck

(OP)
Temperature and shrinkage cracks were controlled by the 7'x7' sawcut grid.
Concrete was a normal 3000psi air entrained mix with standard slump and normal weight aggregate.

RE: split slab concrete parking deck

Standard slump may be too high and 3000 psi is too low... 7'x7' panels for 3" concrete with wheel loads may be a tad too large, in particular, on driving isles...

Dik

RE: split slab concrete parking deck

3ksi is too low in my opinion, especially for a northern freeze/thaw climate with auto traffic.

RE: split slab concrete parking deck

If the slabs are cracking days after initial placement (presumably before they're being driven on), it strikes me as unlikely it's a climate or traffic issue causing it (though I agree 3ksi might be too low).

Brian C Potter
http://simplesupports.wordpress.com

RE: split slab concrete parking deck

Any idea of the placing conditions? Hot, cold, calm, windy, clear, cloudy, etc. All may have a bearing on outcome...

Dik

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