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04-10-10, 04:26 PM

fatclemenza

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Need Experts to Weigh-In

Hi,

I had a new concrete garage floor poured this past Thursday. Everything looked great initially however now that it is dried I have lots of white spots showing up. Perhaps they are water spots - not sure. I'd appreciate if the concrete/masonry experts can provide their professional opinion and what I can do. I posted a few photos here -

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Thanks everyone

FC

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04-11-10, 02:24 AM

Pecos

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That's just the concrete curing. Eventually, it will be all or mostly white/light gray. No worrys (unless there are no crack control joints, then worry.)

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04-11-10, 05:08 AM

fatclemenza

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Thanks Pecos. Pleased to hear that as I thought it was something more serious. We used finished expansion joints using 1/2 " fiberboard strips placed around the inside perimeter of the foundation walls. Poured 3500 PSI with fiber so I'm hoping there are no cracks.

Quick follow-up - after the floor was poured and floated my contractor did not cover the concrete with plastic. I've read different opinions here where concrete is supposed to be covered to help the curing process. Anyway, what's your take on this? Thanks

FC

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04-11-10, 11:13 AM

Tolyn Ironhand

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[QUOTE=fatclemenza;1716382] Poured 3500 PSI with fiber so I'm hoping there are no cracks.
/QUOTE]

There is two types of concrete: One is cracked, and one going to crack. It is pretty much unavoidable. This is the reason for control joints.

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04-11-10, 04:32 PM

Pecos

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Agreed. Expansion joint on the perimeter does not negate the need for contraction joints cut into the slab.

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04-12-10, 08:17 AM

fatclemenza

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Is it not too late to saw in contraction joints into the slab? It's been drying/curing for 5 days now.

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