Concrete topping - tough and rigid?

I have a section of concrete floor (1-1/2" thick x 60 square feet) that is fragmented and deflects slightly when I walk on it because the 5/8" plywood subfloor was inadequately fastened to the joists. To stabilize the concrete, I'm thinking about applying a topping on it, ideally no more than 3/8" but thicker if necessary. Can anyone recommend a topping that's trowleable, thin, crack-resistant/crack-proof and rigid enough to resist deflection from foot traffic? Thanks...
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snipped-for-privacy@respondtogoupplease.com wrote:

Sure, it's called pure unobtainium...
Actually, probably about the only thing that would do the trick given those underlying specifications would be 3/8" steel plate. --
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Looks like I need an updated periodic table.
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There is none. Can you support the weak section from underneath? Fasten through the existing concrete?
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On Oct 15, 8:12�pm, snipped-for-privacy@respondtogoupplease.com wrote:

rip out existing and replace. anything else will fail probably sooner rather than later.
so why do you have a concrete floor over plywood?
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snipped-for-privacy@aol.com wrote:

-- aem sends...
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On Oct 15, 5:12pm, snipped-for-privacy@respondtogoupplease.com wrote:

I'm guessing you've got a deteriorated gypcrete situation.....you "might" be able repair / re-consolidate the fractured crap with a liquid 2 part epoxy like SIKA Sikadur 35 HI-MOD, LV, LPL.
The stuff ain't cheap, comes in a 3 gal "kit".... total 3 gallon kits yields about 700 cubic inches of mixed resin.
I'm not sure how you'd calculate or estimate how much you'd need to do the job but a full kit would give you about 6 ozs per sq ft......
maybe enough re-wet all the cracked pieces & glue them back together?
For my money I'd remove all of it, screw down the plywood & re-pour a new batch. A successful repair would be a long shot.
cheers Bob
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