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Old 06-30-2008, 05:42 AM   #16
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Curing concrete?


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Originally Posted by yesitsconcrete View Post
if its really hot/sunny (above 90f), might cover w/plastic.
it's been a really cold summer. we're barely hanging on to 60 here.
but it's been windy though so thanks for the plastic/tarp idea.

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Old 06-30-2008, 09:01 PM   #17
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Curing concrete?


Technically, the purpose of a curing compound is to slow the rate of water loss in the concrete, thus allowing sufficient moisture for hydration to occur.

Practically, this means that unless it is hot and or windy, or you have a very demanding use for the slab, a commercial curing compound is not needed. If looks don't matter, cover it with poly, damp straw, or even plain old damp dirt.

If looks matter, and the slab will not be painted or coated, then an 800 spec cure and seal is the best option. If environmental conditions dictate using a cure, but the finish appearance does not matter or the slab will be painted or coated, use a 309 spec cure.

For your use, poly is the best bet.
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Old 07-01-2008, 12:01 PM   #18
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Curing concrete?


So it has been poured and you thought the questions would end... but me being me, I have a few more.

(1) We did use a cure as it was particularly windy yesterday. So that means it didn't need to be covered anymore, right? We just created some sort of tent over it in case it rained.

(2) How long before we can remove forms (some say one day, others 7, I've read 28)?

(3) How long before it completely cures and we can put load (the mailboxes)?

(4) The surrounding area still needs a bit of work. We will need to construct a turnout and since the adjacent road is gravel, the turnout will be gravel too. Is it ok to tamp/compact (using a plate compactor) the surrounding area while the concrete is curing?
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Old 07-01-2008, 12:16 PM   #19
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Curing concrete?


ENOUGH, MZ GRUMPETTE - my hair's beginning to hurt, fergawdsake

(1) fine, now move on;

(2) today or tomorrow ( no 1 knows when conc cures despite what you hear,,, 28days is a time period selected/accepted for testing as its a standard easily met by all labs );

(3) when its cured [ gotcha ] we'd probably give it 15days but 28 certainly's better imo;

(4) walk-behind tamp or vibrating walk-behind dble-drum roller ?,,, depending on the amplitude/weight/compaction/moisture/other stuff we just ' know ', we'd wait a wk.

hope it turned out well !
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Old 07-01-2008, 12:22 PM   #20
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Curing concrete?


Alright!
I guess we'll wait a few weeks since there's really no rush at all.
Thanks again!
I have a feeling you'll be just as relieved as I am when this whole project is over.
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Old 07-01-2008, 04:02 PM   #21
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Curing concrete?


The longer you wait to remove the forms, the harder it will be. As a rule, we always strip the next day. Mind your edges for another day or 2 though.
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Old 07-02-2008, 03:32 AM   #22
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Curing concrete?


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The longer you wait to remove the forms, the harder it will be. As a rule, we always strip the next day. Mind your edges for another day or 2 though.

Thank you! We will remove the forms tomorrow then (48hrs post-pour).
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Old 07-02-2008, 06:39 AM   #23
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Curing concrete?


we'll all miss you & breathlessly anticipate your sensual inquiries re building turnouts & roads
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Old 07-02-2008, 06:42 AM   #24
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Curing concrete?


I guess those of us in the business just smile at this....I never use an agent, I wet the slab for a day after the pour, and we strip forms within a few hours if we are still on site, and always by the next morning. In really hot weather, we will flood the slab while troweling.

One thing i will say is this: Mess it up, and it is there for all to see. The best advice i ever got about how to finish concrete was from one of the old timers. You work concrete when it is ready, not when you are ready.
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Old 07-02-2008, 12:30 PM   #25
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Curing concrete?


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Originally Posted by yesitsconcrete View Post
we'll all miss you & breathlessly anticipate your sensual inquiries re building turnouts & roads



Quote:
Originally Posted by joasis View Post
I guess those of us in the business just smile at this....
I know...

Believe it or not, we actually owned a general construction company and growing up, I literally saw thousands of concrete slabs poured. My dear departed dad was a civil engineer and if he saw me sweating this, he'd probably shake his head and laugh his butt off. I just never really paid attention to the construction side of our construction company as I was just in charge of the payroll and sourcing out supplies. I kept telling my husband that if we were back home (I'm not from the US), I could just call up one of our former engineers or foreman and tell them what I need and poof comes out a concrete slab next week. But given that I am doing this for the first time, I'd rather do an over the top job and see which steps I can do without or alter the next time I do a similar job.

The margin of error seems pretty narrow when doing things the first time.
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Old 07-02-2008, 02:30 PM   #26
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Curing concrete?


uh-oh.

We took out the forms today and on the edges of the concrete (the ones covered by the forms) had what looked to be air pockets.

Is this to be expected? Anything we can do about it?

Please don't tell me we have to jackhammer the whole thing and re-pour.
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Old 07-02-2008, 03:38 PM   #27
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Curing concrete?


Oh good golly. You're killing me.

You didn't get the concrete consolidated at the edges by the forms. Its not to be expected, but it happens. Ideally, you'd have rapped on the edges of the forms with a mallet or used a vibrator on the concrete to get rid of air pockets.

Whether or not it is a problem depends on you and your customer. If they're not big enough to cause the slab to fail, you could simply grout them. If they're huge, well...You know.
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Old 07-02-2008, 05:37 PM   #28
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Curing concrete?


I don't think they're that big. They look superficial but I could be wrong. The indentations don't go all the way in (about less than 1/4inch). And they're in isolated areas throughout the edge.

I've attached photos,





Last edited by grumpybear; 07-02-2008 at 05:42 PM.
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Old 07-02-2008, 05:43 PM   #29
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Curing concrete?


thats fine ,,
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Old 07-02-2008, 07:42 PM   #30
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Curing concrete?


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Ideally, you'd have rapped on the edges of the forms with a mallet or used a vibrator on the concrete to get rid of air pockets.
Apparently, they did. My husband and his friend did the concrete work. I'm just the ring master in this circus.

The one comment that my husband's friend had was that the concrete was really thick and heavy (4000psi with fiber reinforcement) so could that have been a factor?

And yes, yes, I know... 4000psi is a bit of an overkill with the size of pad but PO specs....
The fiber reinforcement - ok, I admit, it's my idea. But for an additional $20, what the heck, right?

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